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- Julius-von-Sachs-Institut für Biowissenschaften (25)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (7)
- Universitätsklinikum Münster (3)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Zentrum für Infektionsforschung (ZINF) Würzburg (2)
- Bio-Imaging Center Würzburg (1)
- Biomedical Center Munich, Department of Physiological Chemistry, Ludwig-Maximilians-Universität München (1)
- CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - the development agency of the Brazilian Federal Government (1)
- CBIO, University of Cape Town, South Africa (1)
- Carl-Ludwig-Institut für Physiologie, Universität Leipzig (1)
- Chair of Experimental Biomedicine I (1)
Extracellular signals are translated and amplified via cascades of serially switched protein kinases, MAP kinases (MAPKs). One of the MAP pathways, the classical RAS/RAF/MEK/ERK pathway, transduces signals from receptor tyrosine kinases and plays a central role in regulation of cell proliferation. RAF kinases (A-, B- and C-RAF) function atop of this cascade and convert signals emanating from conformational change of RAS GTPases into their kinase activity, which in turn phosphorylates their immediate substrate, MEK. Disregulated kinase activity of RAF can result in tumor formation, as documented for many types of cancer, predominantly melanomas and thyroid carcinomas (B-RAF). A-RAF is the least characterized RAF, possibly due to its low intrinsic kinase activity and comparatively mild phenotype of A-RAF knockout mice. Nevertheless, the unique phenotype of araf -/- mice, showed predominantly neurological abnormalities such as cerebellum disorders, suggesting that A-RAF participates in a specific process not complemented by activities of B- and CRAF. Here we describe the role of A-RAF in membrane trafficking and identify its function in a specific step of endocytosis. This work led to the discovery of a C-terminally truncated version of A-RAF, AR149 that strongly interfered with cell growth and polarization in yeast and with endocytosis and actin polymerization in mammalian cells. As this work was in progress two splicing isoforms of ARAF, termed DA-RAF1 and DA-RAF2 were described that act as natural inhibitors of RAS-ERK signaling during myogenic differentiation (Yokoyama et al., 2007). DA-RAF2 contains the first 153 aa of A-RAF and thus is nearly identical with AR149. AR149 localized specifically to the recycling endosomal compartments as confirmed by colocalization and coimmunoprecipitation with ARF6. Expression of AR149 interferes with recycling of endocytosed transferrin (Tfn) and with actin polymerization. The endocytic compartment, where internalized Tfn is trapped, was identified as ARF6- and RAB11- positive endocytic vesicles. We conclude that the inhibition of Tfn trafficking in the absence of A-RAF or under overexpression of AR149 occurs between tubular- and TGNassociated recycling endosomal compartments. siRNA-mediated depletion of endogenous A-RAF or inhibition of MEK by U0126 mimic the AR149 overexpression phenotype, supporting a role of ARAF regulated ERK signalling at endosomes that is controlled by AR149 and targets ARF6. Our data additionally suggest EFA6 as a partner of A-RAF during activation of ARF6. The novel findings on the A-RAF localization and the interaction with ARF6 have led to a new model of ARAF function were A-RAF via activation of ARF6 controls the recycling of endocytic vesicles.Endocytosis and rapid recycling of synaptic vesicles is critically important for the physiological function of neurons. The finding, that A-RAF regulates endocytic recycling open a new perspective for investigation of the role of A-RAF in the nervous system.
Platelets play a central role in thrombosis, hemostasis, and inflammation. Here, we show that activated platelets release inorganic polyphosphate (polyP), a polymer of 60- 100 phosphate residues that directly bound to and activated the plasma protease factor XII. PolyP-driven factor XII-activation triggered release of the inflammatory mediator bradykinin by plasma kallikrein-mediated kininogen processing. PolyP increased vascular permeability and induced fluid extravasation in skin microvessels of mice. Mice deficient in factor XII or bradykinin receptors were resistant to polyP-induced leakage. PolyP initiated clotting of plasma via the contact pathway. Ablation of intrinsic coagulation pathway proteases factor XII and factor XI protected mice from polyPtriggered lethal pulmonary embolism. Targeting polyP with phosphatases interfered with procoagulant activity of activated platelets and blocked platelet-induced thrombosis in mice. Infusion of polyP restored defective plasma clotting of Hermansky- Pudlak Syndrome patients, which lack platelet polyP. The data identify polyP as a new class of mediator having fundamental roles in platelet-driven proinflammatory and procoagulant disorders.
Das Endothel bildet eine einschichtige Zellbarriere zwischen Blut und interstitiellem Gewebe, deren Durchlässigkeit entscheidend durch die sekundären Botenstoffe Ca2+ und cAMP reguliert wird. Während Ca2+ durch eine verstärkte Kontraktion der Endothelzellen die Permeabilität erhöht, fördert cAMP die Adhäsion der Zellen und unterstützt somit die Barrierefunktion. Es ist bekannt, dass Thrombin durch einen Anstieg der intrazellulären Ca2+-Konzentration und vermutlich auch durch eine Hemmung der cAMP-Konzentration zu einer Permeabilitätserhöhung führt. Ziel dieser Arbeit war es, Thrombin-induzierte Änderungen der cAMP-Konzentration in Echtzeit in lebenden Endothelzellen mittels Fluorescence-Resonance-Energy-Transfer (FRET) zu untersuchen. Hierfür wurden Human-Umbilical-Vein-Endothelial-Cells (HUVECs) mit dem FRET-basierten cAMP-Sensor Epac1-camps transfiziert. Die Bindung von cAMP an Epac1-camps führt zu einer Konformationsänderung des Sensors und damit zu einer Abschwächung des FRET. Mit Hilfe dieses Sensors kann die cAMP-Konzentration mit hoher zeitlicher Auflösung in einzelnen lebenden Zellen gemessen werden. Untersucht wurde der Effekt von Thrombin auf die cAMP-Konzentration in Endothelzellen, deren cAMP-Konzentration durch Stimulierung endogener β-Rezeptoren erhöht war. Thrombin erniedrigte Ca2+-abhängig die cAMP-Konzentration um ca. 30 %. Dieser Abfall der cAMP-Konzentration folgte zeitlich verzögert dem Thrombin-induzierten Ca2+-Signal. Die cAMP-Konzentration erreichte ca. 30 s nach der Thrombinzugabe ein Minimum und stieg danach wieder an. Durch die Herunterregulierung der durch Ca2+ direkt inhibierten Adenylatzyklase 6 (AC6) mittels siRNA wurde die Thrombin-induzierte Abnahme der cAMP-Konzentration vollständig aufgehoben. Dies bestätigte, dass Thrombin durch die Ca2+-vermittelte Inhibierung der AC6 eine Abnahme der cAMP-Konzentration verursacht. Ohne β-adrenerge Stimulation führte die Applikation von Thrombin zu einem langsamen Anstieg der cAMP-Konzentration, der mehrere Minuten anhielt. Dieser cAMP-Konzentrationsanstieg beruhte auf der Ca2+-abhängigen Aktivierung der Phospholipase A2 (PLA2). Diese setzt Arachidonsäure aus Membranphospholipiden frei, die als Substrat für die Synthese verschiedener Prostaglandine dient. Durch die pharmakologische Beeinflussung von Zyklooxygenasen und Prostazyklinrezeptoren konnte gezeigt werden, dass die Synthese von Prostazyklin und die anschließende Stimulation Gs-gekoppelter Prostazyklinrezeptoren zum Thrombin-induzierten Anstieg der cAMP-Konzentration führte. Da die Physiologie der Endothelzellen im Gefäß stark von Faktoren aus der unmittelbaren Umgebung beeinflusst wird, ist die Messung der Änderungen der cAMP-Konzentration in Endothelzellen, die sich innerhalb eines Gewebes befinden, von sehr großer Bedeutung. Deshalb war die Generierung transgener Mäuse mit einer gewebespezifischen Expression des FRET-Sensors Epac1-camps in Endothelzellen ein weiteres Ziel dieser Arbeit. Durch Anwendung eines Cre-Rekombinase/loxP-Ansatzes konnten transgene Mäuse generiert werden, die Epac1-camps spezifisch in Endothelzellen exprimierten. An isolierten pulmonären Endothelzellen konnte die Funktionalität des transgen exprimierten Sensors Epac1-camps nachgewiesen werden. Die Echtzeitmessung der Thrombin-induzierten Änderungen der cAMP-Konzentration verdeutlichte ein zeitlich sehr komplexes Wechselspiel zwischen Ca2+- und cAMP-Signalen, das die Barrierefunktion des Endothels maßgeblich beeinflussen wird. Die transgene Expression von Epac1-camps in Endothelzellen ermöglicht in Zukunft die Untersuchung der Thrombin-verursachten Änderungen der cAMP-Konzentration und der Permeabilität innerhalb eines intakten Gefäßes.
Mycobacterium tuberculosis is the causative agent of tuberculosis and responsible for more than eight million new infections and about two million deaths each year. Novel chemotherapeutics are urgently needed to treat the emerging threat of multi drug resistant and extensively drug resistant strains. Cell wall biosynthesis is a widely used target for chemotherapeutic intervention in bacterial infections. In mycobacteria, the cell wall is comprised of mycolic acids, very long chain fatty acids that provide protection and allow the bacteria to persist in the human macrophage. The type II fatty acid biosynthesis pathway in Mycobacterium tuberculosis synthesizes fatty acids with a length of up to 56 carbon atoms that are the precursors of the critical mycobacterial cell wall components mycolic acids. KasA, the mycobacterial ß-ketoacyl synthase and InhA, the mycobacterial enoyl reductase, are essential enzymes in the fatty acid biosynthesis pathway and validated drug targets. In this work, KasA was expressed in Mycobacterium smegmatis, purified and co-crystallized in complex with the natural thiolactone antibiotic thiolactomycin (TLM). High-resolution crystal structures of KasA and the C171Q KasA variant, which mimics the acyl enzyme intermediate of the enzyme, were solved in absence and presence of bound TLM. The crystal structures reveal how the inhibitor is coordinated by the enzyme and thus specifically pinpoint towards possible modifications to increase the affinity of the compound and develop potent new drugs against tuberculosis. Comparisons between the TLM bound crystal structures explain the preferential binding of TLM to the acylated form of KasA. Furthermore, long polyethylene glycol molecules are bound to KasA that mimic a fatty acid substrate of approximately 40 carbon atoms length. These structures thus provide the first insights into the molecular mechanism of substrate recognition and reveal how a wax-like substance can be accommodated in a cytosolic environment. InhA was purified and co-crystallized in complex with the slow, tight binding inhibitor 2-(o-tolyloxy)-5-hexylphenol (PT70). Two crystal structures of the ternary InhA-NAD+-PT70 were solved and reveal how the inhibitor is bound to the substrate binding pocket. Both structures display an ordered substrate binding loop and corroborate the hypothesis that slow onset inhibition is coupled to loop ordering. Upon loop ordering, the active site entrance is more restricted and the inhibitor is kept inside more tightly. These studies provide additional information on the mechanistic imperatives for slow onset inhibition of enoyl ACP reductases.
Marine sponges (Porifera) harbor diverse microbial communities within their mesohyl, among them representatives of the phylum Actinobacteria, commonly known as actinomycetes. Actinomycetes are prolific producers of pharmacologically important compounds and are responsible for producing the majority of antibiotics. The main aim of this Ph.D. study was to investigate the metabolic potential of the sponge-associated actinomycetes to produce novel anti-infective agents. The first aim was to cultivate actinomycetes derived from different marine sponges. 16S rDNA sequencing revealed that the strains belonged to diverse actinomycete genera such as Gordonia, Isoptericola, Micromonospora, Nocardiopsis, Saccharopolyspora and Streptomyces. Phylogenetic analyses and polyphasic characterization further revealed that two of these strains represent new species, namely Saccharopolyspora cebuensis strain SPE 10-1T (Pimentel-Elardo et al. 2008a) and Streptomyces axinellae strain Pol001T (Pimentel-Elardo et al. 2008b). Furthermore, secondary metabolite production of the actinomycete strains was investigated. The metabolites were isolated using a bioassay-guided purification scheme followed by structure elucidation using spectroscopic methods and subjected to an elaborate anti-infective screening panel. Several interesting compounds were isolated namely, the novel polyketides cebulactam A1 and A2 (Pimentel-Elardo et al. 2008c), a family of tetromycin compounds including novel derivatives, cyclodepsipeptide valinomycin, indolocarbazole staurosporine, diketopiperazine cycloisoleucylprolyl and butenolide. These compounds exhibited significant anti-parasitic as well as protease inhibitory activities. The third aim of this Ph.D. study was to identify biosynthetic gene clusters encoding for nonribosomal peptide synthetases (NRPS) and polyketide synthases (PKS) present in the actinomycete strains. Genomic library construction and sequencing revealed insights into the metabolic potential and biosynthetic pathways of selected strains. An interesting NRPS system detected in Streptomyces sp. strain Aer003 was found to be widely distributed in several sponge species, in an ascidian and in seawater and is postulated to encode for a large peptide molecule. Sequencing of the PKS gene cluster of Saccharopolyspora cebuensis strain SPE 10-1T allowed the prediction of the cebulactam biosynthetic pathway which utilizes 3-amino-5-hydroxybenzoic acid as the starter unit followed by successive condensation steps involving methylmalonyl extender units and auxiliary domains responsible for the polyketide assembly. In conclusion, this Ph.D. study has shown that diverse actinomycete genera are associated with marine sponges. The strains, two of them novel species, produced diverse chemical structures with interesting anti-infective properties. Lastly, the presence of biosynthetic gene clusters identified in this study substantiates the biosynthetic potential of actinomycetes to produce exploitable natural products and hopefully provides a sustainable supply of anti-infective compounds.
Recent progresses and developments in molecular biology provide a wealth of new but insufficiently characterised data. This fund comprises amongst others biological data of genomic DNA, protein sequences, 3-dimensional protein structures as well as profiles of gene expression. In the present work, this information is used to develop new methods for the characterisation and classification of organisms and whole groups of organisms as well as to enhance the automated gain and transfer of information. The first two presented approaches (chapters 4 und 5) focus on the medically and scientifically important enterobacteria. Its impact in medicine and molecular biology is founded in versatile mechanisms of infection, their fundamental function as a commensal inhabitant of the intestinal tract and their use as model organisms as they are easy to cultivate. Despite many studies on single pathogroups with clinical distinguishable pathologies, the genotypic factors that contribute to their diversity are still partially unknown. The comprehensive genome comparison described in Chapter 4 was conducted with numerous enterobacterial strains, which cover nearly the whole range of clinically relevant diversity. The genome comparison constitutes the basis of a characterisation of the enterobacterial gene pool, of a reconstruction of evolutionary processes and of comprehensive analysis of specific protein families in enterobacterial subgroups. Correspondence analysis, which is applied for the first time in this context, yields qualitative statements to bacterial subgroups and the respective, exclusively present protein families. Specific protein families were identified for the three major subgroups of enterobacteria namely the genera Yersinia and Salmonella as well as to the group of Shigella and E. coli by applying statistical tests. In conclusion, the genome comparison-based methods provide new starting points to infer specific genotypic traits of bacterial groups from the transfer of functional annotation. Due to the high medical importance of enterobacterial isolates their classification according to pathogenicity has been in focus of many studies. The microarray technology offers a fast, reproducible and standardisable means of bacterial typing and has been proved in bacterial diagnostics, risk assessment and surveillance. The design of the diagnostic microarray of enterobacteria described in chapter 5 is based on the availability of numerous enterobacterial genome sequences. A novel probe selection strategy based on the highly efficient algorithm of string search, which considers both coding and non-coding regions of genomic DNA, enhances pathogroup detection. This principle reduces the risk of incorrect typing due to restrictions to virulence-associated capture probes. Additional capture probes extend the spectrum of applications of the microarray to simultaneous diagnostic or surveillance of antimicrobial resistance. Comprehensive test hybridisations largely confirm the reliability of the selected capture probes and its ability to robustly classify enterobacterial strains according to pathogenicity. Moreover, the tests constitute the basis of the training of a regression model for the classification of pathogroups and hybridised amounts of DNA. The regression model features a continuous learning capacity leading to an enhancement of the prediction accuracy in the process of its application. A fraction of the capture probes represents intergenic DNA and hence confirms the relevance of the underlying strategy. Interestingly, a large part of the capture probes represents poorly annotated genes suggesting the existence of yet unconsidered factors with importance to the formation of respective virulence phenotypes. Another major field of microarray applications is gene expression analysis. The size of gene expression databases rapidly increased in recent years. Although they provide a wealth of expression data, it remains challenging to integrate results from different studies. In chapter 6 the methodology of an unsupervised meta-analysis of genome-wide A. thaliana gene expression data sets is presented, which yields novel insights in function and regulation of genes. The application of kernel-based principal component analysis in combination with hierarchical clustering identified three major groups of contrasts each sharing overlapping expression profiles. Genes associated with two groups are known to play important roles in Indol-3 acetic acid (IAA) mediated plant growth and development as well as in pathogen defence. Yet uncharacterised serine-threonine kinases could be assigned to novel functions in pathogen defence by meta-analysis. In general, hidden interrelation between genes regulated under different conditions could be unravelled by the described approach. HMMs are applied to the functional characterisation of proteins or the detection of genes in genome sequences. Although HMMs are technically mature and widely applied in computational biology, I demonstrate the methodical optimisation with respect to the modelling accuracy on biological data with various distributions of sequence lengths. The subunits of these models, the states, are associated with a certain holding time being the link to length distributions of represented sequences. An adaptation of simple HMM topologies to bell-shaped length distributions described in chapter 7 was achieved by serial chain-linking of single states, while residing in the class of conventional HMMs. The impact of an optimisation of HMM topologies was underlined by performance evaluations with differently adjusted HMM topologies. In summary, a general methodology was introduced to improve the modelling behaviour of HMMs by topological optimisation with maximum likelihood and a fast and easily implementable moment estimator. Chapter 8 describes the application of HMMs to the prediction of interaction sites in protein domains. As previously demonstrated, these sites are not trivial to predict because of varying degree in conservation of their location and type within the domain family. The prediction of interaction sites in protein domains is achieved by a newly defined HMM topology, which incorporates both sequence and structure information. Posterior decoding is applied to the prediction of interaction sites providing additional information of the probability of an interaction for all sequence positions. The implementation of interaction profile HMMs (ipHMMs) is based on the well established profile HMMs and inherits its known efficiency and sensitivity. The large-scale prediction of interaction sites by ipHMMs explained protein dysfunctions caused by mutations that are associated to inheritable diseases like different types of cancer or muscular dystrophy. As already demonstrated by profile HMMs, the ipHMMs are suitable for large-scale applications. Overall, the HMM-based method enhances the prediction quality of interaction sites and improves the understanding of the molecular background of inheritable diseases. With respect to current and future requirements I provide large-scale solutions for the characterisation of biological data in this work. All described methods feature a highly portable character, which allows for the transfer to related topics or organisms, respectively. Special emphasis was put on the knowledge transfer facilitated by a steadily increasing wealth of biological information. The applied and developed statistical methods largely provide learning capacities and hence benefit from the gain of knowledge resulting in increased prediction accuracies and reliability.
Viele Membranrezeptoren liegen als über Disulfidbrücken-verbundene Dimere vor. Ein Nachweis der Dimerisierung ist in diesen Fällen methodisch klar und einfach zu erbringen. Für die meisten G-Protein-gekoppelten Rezeptoren dagegen ist weder die Existenz von Di- oder Oligomeren noch deren Funktion eindeutig belegt. Meist wurden Methoden wie Coimmunopräzipitation und Resonanz-Energie-Transfer-Verfahren wie BRET oder FRET verwendet, um Protein-Protein-Interaktionen zu untersuchen. Trotz ihrer hohen Sensitivität besitzen diese Methoden einige Grenzen und können je nach experimentellem Ansatz und Verwendung verschiedener Kontrollen, unterschiedliche Ergebnisse hinsichtlich des Vorliegens einer Protein-Protein-Interaktion liefern. Weder die Stabilität der Interaktion, noch die Fraktion der interagierenden Proteine kann mittels Resonanz-Energie-Transfer-Assays zuverlässig ermittelt werden. Auch die Größe der Komplexe ist nicht oder nur technisch aufwendig bestimmbar. Deshalb wurde in dieser Arbeit eine neue, unabhängige Methode entwickelt, um Rezeptor-Rezeptor-Interaktionen in lebenden Zellen genauer untersuchen zu können. Diese auf „Fluorescence Recovery after Photobleaching“ basierende Mikroskopie-Methode erlaubt die Mobilität von Proteinen zu bestimmen. Um Homointeraktionen zwischen Proteinen messen zu können, müssen zwei Protein-Fraktionen mit unterschiedlicher Mobilität vorliegen. Deshalb wurde eine Rezeptor-Fraktion extrazellulär mit YFP markiert und mit Hilfe polyklonaler Antikörper gegen YFP spezifisch immobilisiert. Die andere Rezeptorfraktion wurde intrazellulär mit CFP oder Cerulean markiert und wurde deshalb nicht von extrazellulären Antikörpern erkannt. So konnten mittels Zwei-Farben-FRAP potenzielle Interaktionen zwischen den immobilisierten extrazellulär-markierten Rezeptoren und den intrazellulär-markierten Rezeptoren durch eine Mobilitätsänderung letzterer detektiert werden. Diese Methode wurde mittels eines monomeren (CD86) und kovalent dimeren (CD28) Rezeptors validiert. Es zeigte sich, dass eine spezifische Immobilisierung extrazellulär-markierter Proteine nur durch polyklonale, nicht aber durch monoklonale Antikörper gegen YFP erreicht werden konnte. Intrazellulär-markierte Proteine wurden hierbei in ihrer Mobilität nicht durch die extrazellulären Antikörper beeinflusst. Bei Immobilisierung des extrazellulär-markierten CD86 war das coexprimierte, intrazellulär-markierte CD86-CFP weiterhin voll mobil. Außerdem zeigte das Monomer CD86 eine vom relativen CFP-YFP-Expressionsverhältnis unabhängige Mobilität. Dieses Ergebnis ließ den Schluss zu, dass extra- und intrazellulär-markiertes CD86 nicht miteinander interagieren und als Monomer vorliegen. Die Mobilität des kovalenten Dimers CD28 war dagegen abhängig vom CFP–YFP-Expressionsverhältnis und stimmte gut mit theoretisch erwarteten Werten für ein Dimer überein. Die Anwendung der Zwei-Farben-Methode zur Untersuchung von Interaktionen zwischen ß1- und ß2-adrenergen Rezeptoren zeigte Unterschiede zwischen beiden Rezeptor-Subtypen. ß1-AR zeigte eine spezifische transiente Interaktion, ß2-AR dagegen lagen als stabile Oligomere höherer Ordnung vor. Die transiente Interaktion zwischen ß1-AR und die stabile Oligomerisierung von ß2-AR wurde nicht nur in HEK 293T-Zellen sondern auch in neonatalen Rattenkardiomyozyten und bei 37 °C beobachtet. Ferner hatte der Aktivierungszustand des jeweiligen Rezeptors keinen Einfluß auf das Ausmaß der Interaktion. Zwischen ß1- und ß2-AR wurde nur eine sehr schwache und instabile Heterointeraktion mittels der Zwei-Farben-FRAP-Methode beobachtet. Um zu überprüfen, ob eine direkte Interaktion zwischen den adrenergen Rezeptoren vorliegt, wurde die BRET-Methode verwendet. Mittels BRET wurde eine direkte Interaktion zwischen ß2-AR festgestellt, jedoch konnte nicht zwischen Dimeren und Oligomeren höherer Ordnung unterschieden werden. Bei ß1-AR fand bei höheren YFP-Rluc-Expressionsverhältnissen ein spezifischer Energietransfer statt. Bei niedrigeren Expressionsverhältnissen lag das Signal jedoch im unspezifischen Bereich. Auch bei Untersuchung der Heterointeraktion zwischen ß1- und ß2-AR konnte keine klare Aussage über eine spezifische Interaktion zwischen beiden Rezeptor-Subtypen getroffen werden.
The RS1 protein (gene RSC1A1) participates in regulation of Na+-D-glucose cotransporter SGLT1 and some other solute carriers. In subconfluent LLC-PK1 cells, RS1 inhibits release of SGLT1 from the trans-Golgi network and transcription of SGLT1. In subconfluent cells, RS1 is localized in the nucleus and the cytoplasm whereas confluent cells contain predominantly cytoplasmic RS1. In the present study, the mechanism and regulation of confluence-dependent nuclear location of RS1 was investigated. Confluence dependent nuclear location of RS1 was shown to be regulated by the cell cycle. A nuclear shuttling signal (NS) in pRS1 was identified that ensures confluence-dependent distribution of pRS1 and comprises nuclear localization signal (NLS) and nuclear export signal (NES). The NLS and NES of RS1 mediate translocation into and out of the nucleus via importin ß1 and CRM1, respectively, and the nuclear/cytoplasmic distribution of the RS1 protein is determined by the nuclear export activity. The adjacent protein kinase C (PKC) phosphorylation site at serine 370 of pRS1 was shown to control nuclear localization driven by NS and is necessary for the differential localization of RS1 in quiescent versus proliferating cells. Basing on the data of site-directed mutagenesis, PKC activation experiments and mass spectrometry analysis of RS1 phosphorylation, the following model of the regulation of RS1 nuclear location in LLC-PK1 cells was proposed. In subconfluent cells, RS1 is actively imported into the nucleus whereas nuclear export of RS1 is not active leading to accumulation of RS1 in the nucleus. After confluence, phosphorylation of serine 370 of pRS1 by PKC takes place leading to enhancement of RS1 nuclear export and predominantly cytoplasmic distribution of the protein in the confluent cells. The confluence-dependent regulation of RS1 localization may control SGLT1 expression during regeneration of enterocytes in small intestine and during regeneration of renal tubular cells after hypoxemic stress. Moreover, the gene expression profiling of mouse embryonic fibroblasts with RS1-/- genotype suggests that transcriptional regulation by RS1 might be important for the cell cycle and cell division. Since RS1 localization depends on the cell cycle, RS1 might play a role in the regulation of the solute carriers during specific phases of the cell cycle.
The majority of rapid cell-to-cell communication mechanisms and information processing within the nervous system makes use of chemical synapses. Fast neurotransmission on these sites not only requires very close apposition of pre- and postsynaptic partners, but also depends on an effective structural arrangement of cellular components on both sides of the synaptic cleft. Synaptic vesicles fuse at active zones (AZs), characterized by an electron-dense protein mesh of insufficiently characterized composition and function. EM analysis of synapses identified electron dense structures thought (but not proven) to play an important role for vesicle release efficacy. The molecular organization of presynaptic AZs during Ca2+ influx–triggered neurotransmitter release is currently a focus of intense investigation. Due to its appearance in electron micrographs, dense bodies at Drosophila synapses were named T-bars. Together with the lab of Erich Buchner, we recently showed that Bruchpilot (BRP) of the Drosophila melanogaster, homologous to the mammalian CAST/ERC family in its N-terminal half, is essential for the T-bar assembly at AZs and efficient neurotransmitter release respectively. The question, in which way BRP contributes to functional and structural organization of the AZ, was a major focus of this thesis. First, stimulated emission depletion microscopy (STED), featuring significantly increased optical resolution, was used to achieve first insights into ‘cytoarchitecture’ of the AZ compartment. In addition, in vivo live imaging experiments following identified populations of synapses over extended periods were preformed to address the trafficking of protein at forming synapses and thereby providing a temporal sequence for the AZ assembly process. Apart from BRP, two additional AZ proteins, DLiprin-α and DSyd-1, were included into the analysis, which were both shown to contribute to efficient AZ assembly. Drosophila Syd-1 (DSyd-1) and Drosophila Liprin-α (DLiprin-α) clusters initiated AZ assembly, finally forming discrete ‘quanta’ at the AZ edge. ELKS-related Bruchpilot, in contrast, accumulated late from diffuse pools in the AZ center, where it contributed to the electron dense specialization by adopting an extended conformation vertical to the AZ membrane. We show that DSyd-1 and DLiprin-α are important for efficient AZ formation. The results of this thesis describe AZ assembly as a sequential protracted process, with matured AZs characterized by sub-compartments and likely quantal building blocks. This step-wise, in parts reversible path leading to mature AZ structure and function offers new control possibilities in the development and plasticity of synaptic circuits.
Diverse roles of B cells in the pathophysiology of rheumatoid arthritis are now well established. B cells contribute to autoimmunity by producing autoantibodies, processing autoantigen and the production of different cytokines which are involved in the inflammatory cascade. Therefore approaches to target B lymphocytes directly or indirectly are developed for clinical practice to treat autoimmune diseases including rheumatoid arthritis. Transient B cell depletion by rituximab (anti-CD20 antibody) has gained prime importance in recent years. Meanwhile anti-CD20 mediated transient B cell depletion therapy is now used with clinical efficiency in the treatment of patients with rheumatoid arthritis. Rituximab induces noteworthy changes in the homeostasis of peripheral B cell subpopulations during the repletion phase with emerging immature B cells in peripheral blood followed by normalization of the naïve B cell pool and a longterm delay in memory B cell subsets in patients with rheumatoid arthritis. Particularly IgD+CD27+ memory B cells repopulate very slowly during B cell regeneration. In a prospective clinical study, our laboratory has shown that the overall number of memory B cells correlates well to the duration of clinical response to rituximab. Little is known about the particular molecular changes in the memory B cell repertoire after rituximab therapy. To better understand peripheral memory B cell subsets, we explored in detail the somatic mutational frequency and pattern of Ig-VH3 gene rearrangements by using a single B cell sorting technique followed by nested PCR before and up to 6 years after rituximab therapy in 18 RA patients. We compared rituximab inflicted dynamics of mutational acquisition to memory B cell repopulation in 4 healthy donors and 6 non RA patients undergoing high dose chemotherapy followed by autologous or allogeneic stem cell transplantation (SCT). Firstly we analyzed the peripheral composition of memory B cell subsets. The phenotypic analysis of peripheral pre-switch (IgD+CD27+) and post-switch (IgD-CD27+) memory B cells did not reveal any quantitative differences in RA patients prior to B cell depletion therapy compared to healthy donors. However extending those studies in directly analysing the B cell immunoglobulin receptor from individual B cells of RA patients and healthy controls brought interesting results. Pre-switched and post-switched memory B cells showed a highly significant difference in the amount of mutations/sequence. The population of IgD+CD27+ memory B cells is comprised of non-mutated, low and highly mutated (median= 9 mutations/ sequence) rearranged Ig receptors whereas the IgD-CD27+ memory B cell compartment shows quite uniformly highly mutated (median 18 mutations/ sequence) sequences indicating a significant difference between these two groups (mutational frequencies 3.83±0.19% vs. 7.1±0.53%; P=0.0001). Profound changes were noted in the re-emerging pre-switch memory B cells (IgD+/ CD27+) after transient B cell depletion with rituximab. These cells showed over a time period of 6 years after treatment with rituximab significantly delayed acquisition of mutations in Ig receptors on the single B cell level. One year after a single course of rituximab 84% of single repopulating IgD+/CD27+ B cells were unmutated and no highly mutated Ig-VH gene rearrangements were found(P=0.0001). Over time increasing numbers of mutations could be detected i-e 7.8% during 2nd year of regeneration (P=0.0001), 14% after 4 years (n=2). Nevertheless even 6 years after rituximab, VH mutations in IgD+ memory B cells were still reduced with 27% highly mutated sequences compared to 52% pre therapy(P=0.0001). Post-therapy analysis of CDR3 length of regenerated IgD+ memory B cells revealed increased CDR3 length which also correlates well with elevated number of non-mutated VH gene rearrangements observed during repletion phase. In comparison patients undergoing high dose chemotherapy followed by allogeneic stem cell transplantation repopulated IgD+ memory cells earlier with higher numbers of mutations in IgD+ memory B cells. One year after transplantation Ig receptors showed already 22% highly mutated and 42 % unmutated VH rearrangements. These findings indicated that anti-CD20 mediated B cell depletion seems not only to delay the production of pre-switch memory B cells but also significantly affects the acquisition of mutations in the IgD+ memory B cell pool. In contrary to the mutational pattern of IgD+ memory B cells after rituximab class switched memory B cells repopulate in the periphery with quantitatively normal mutations in their Ig receptors. Although the numeric replenishment of these recirculating class-switched memory B cells was also reduced after rituximab, we found no delay in quantitative acquisition of mutations also an increased proportion of IgA expressing B cells in this memory B cell subset was detected. Our data showed that post-therapy mutational targeting in RGYW/WRCY motifs were significantly increased as compared with that of pre-treatment (27% before rituximab vs. 43% after therapy, P=0.0003) indicating that affinity maturation may operate differently in class-switched memory B cells before and after B cell depletion. These results indicate a normal development process with an unimpaired mechanism of mutational acquisition in class-switched memory B cells. These data argue for different requirements to undergo somatic hypermutations in IgD+ memory B cells in comparison to class switched memory B cells. To conclude, our work has demonstrated for the first time a delayed acquisition of somatic hypermutations at single Ig receptor VH gene rearrangements of IgD+ memory B cells in comparison to class-switched memory B cells. These results demonstrate that IgD+ memory B cells are particularly susceptible to anti-CD20 treatment in patients with rheumatoid arthritis. In addition antigenic pressure and/or selection are substantially reduced by rituximab therapy which is basically not seen in the class-switched memory compartment. These data are in line with the hypothesis that IgD+ memory B cells have distinct requirements for activating their mutational machinery compared to class-switched memory B cells which recover normal mutations during regeneration phase. The results have implications in understanding the pathophysiology of memory B cell in rheumatoid arthritis and may be helpful in designing new targeted therapies.
The proteins of the RAF family (A-RAF, B-RAF, and C-RAF) are serine/threonine-kinases that play important roles in development, mature cell regulation and cancer. Although it is widely held that their localization on membranes is an important aspect of their function, there are few data addressing this aspect of their mode of action. Here, we report that each member of the RAF family exhibits a specific distribution at the level of cellular membranes, and that C-RAF is the only isoform that directly targets mitochondria. We find that the RAF kinases exhibit intrinsic differences in terms of mitochondrial affinity, and that C-RAF is the only isoform that binds this organelle efficiently. This affinity is conferred by the C-RAF amino-terminal domain, and does not depend on the presence of RAS GTPases on the surface of mitochondria. Furthermore, we analyze the consequences of C-RAF activation on the cellular and molecular level. C-RAF activation on mitochondria dramatically changes their morphology and their subcellular distribution. On the molecular level, we examine the role of C-RAF in the regulation of the pro-apoptotic Bcl-2 family member BAD. This protein exhibits the original mode of regulation by phosphorylation. Although several reports addressed the regulation of BAD by C-RAF, the exact mode of action as well as the consequences of C-RAF activation on BAD are still not completely understood. We show that the inducible activation of C-RAF promotes the rapid phosphorylation of BAD on Serine-112 (Ser-75 in the human protein), through a cascade involving the kinases MEK and RSK. Our findings reveal a new aspect of the regulation of BAD protein and its control by the RAF pathway: we find that C-RAF activation promotes BAD poly-ubiquitylation in a phosphorylation-dependent fashion, and increases the turn-over of this protein through proteasomal degradation.
Echinococcus multilocularis is the causative agent of alveolar echinococcosis (AE), a life-threatening disease with limited options of chemotherapeutic treatment. Anti-AE chemotherapy is currently based on a single class of drugs, the benzimidazoles. Although acting parasitocidic in vitro, benzimidazoles are merely parasitostatic during in vivo treatment of AE and cause severe site effects. In the case of operable lesions, the resection of parasite tissue needs to be supported by a prolonged chemotherapy. Thus, the current treatment options for AE are inadequate and require alternatives. In the present work, the flatworm signaling pathways were analyzed to establish potential targets for novel therapeutic approaches. I focused on factors that are involved in development and proliferation of E. multilocularis using molecular, biochemical and cell biological methods. Among the analysed factors were three MAP kinases of the parasite, EmMPK1, an Erk-1/2 orthologue, EmMPK2, a p38 orthologue and EmMPK3, an Erk7/8 orthologue. Further, I identified and characterized EmMKK2, a MEK1/2 orthologue of the parasite, which, together with the known kinases EmRaf and EmMPK1, forms an Erk1/2-like MAPK module. Moreover, I was able to demonstrate several influences of host growth factors such as EGF (epidermal growth factor) and insulin on worm signaling mechanisms and larval growth, including the phosphorylation of Elp, an ezrin-radixin-moesin like protein, EmMPK1, EmMPK3 and increased mitotic activity of Echinococcus cells. In addition, several substances were examined for their efficacy against the parasite including (i) general tyrosine kinase inhibitors (PP2, leflunamide), (ii) compounds designed to inhibit the activity of receptor tyrosine kinases, (iii) anti-neoplastic agents (miltefosine, perifosine), (iv) serine/threonine kinase inhibitors that have been designed to block the Erk1/2 MAPK cascade and (v) inhibitors of p38 MAPKs. In these studies, EmMPK2 proved to be a promising drug target for the following reasons. Amino acid sequence analysis disclosed several differences to human p38 MAPKs, which is likely to be the reason for the observed enhanced basal activity of recombinant EmMPK2 towards myelin basic protein in comparison to human recombinant p38 MAPK-α. In addition, the prominent auto-phosphorylation activity of the recombinant EmMPK2 protein together with the absence of an interaction with the Echinococcus MKKs suggest a different mechanism of regulation compared to the human enzyme. EmMPK2 activity could be effectively inhibited in vitro and in cultivated metacestode vesicles by treatment with SB202190 and ML3403, two ATP-competitive pyridinyl imidazole inhibitors of p38 MAPKs, in a concentration-dependent manner. Moreover, both compounds, in particular ML3403, caused parasite vesicle inactivation at concentrations which did not affect cultured mammalian cells. Likewise, during the cultivation of Echinococcus primary cells, the presence of ML3403 prevented the generation of new vesicles. Targeting members of the EGF signaling pathway, particulary of the Erk1/2-like MAPK cascade, with Raf and MEK inhibitors prevented the phosphorylation of EmMPK1 in metacestodes cultivated in vitro. However, although parasite growth was prevented under these conditions, the structural integrity of the metacestode vesicles maintained during long-term cultivation in the presence of the MAPK cascade inhibitors. Similar results were obtained when studying the effects of other drugs mentioned above. Taken together, several targets could be identified that reacted with high sensitivity to the presence of inhibitory substances, but did not cause the parasite’s death with one exception, the pyridinyl imidazoles. Based on the presented data, I suggest pyridinyl imidazoles as a novel class of anti-Echinococcus drugs and imply EmMPK2 as survival signal mediating factor, the inhibition of which could be used for the treatment of AE.
Cancer immune therapy represents a promising alternative to conventional anti tumour therapy like radiation, surgical excision of the tumour or classical chemotherapy. The biggest advantage of cancer immune therapy is specificity, achieved by targeting tumour-associated antigens with the effector arms of the host immune system. This is believed to result in less adverse effects than standard therapy and reaches presumably also metastatic lesions at distant sites from the primary tumour. However, cancer immune therapy by vaccination against tumour antigens failed to translate into clinical success, yet. Furthermore, despite tremendous clinical efforts malignant disease still results in high mortalities giving rise to the need for novel vaccination-based therapies against cancer. An interesting approach in this respect is the use of bacteria like attenuated salmonellae as carriers for heterologous cancer antigens. In numerous preclinical studies Salmonella-based vaccines could elicit cell mediated immune responses of the CD4+ and CD8+ type against own and heterologous antigens which make them ideally suited for anti tumour therapy. Special delivery systems in Salmonella carriers like surface display or secretion of antigens were shown to be advantageous for the immunological outcome. This work focussed on developing novel Salmonella carriers for immune therapy against cancer. In a first project, TolC, a multifunctional outer membrane protein of E. coli was utilized as membrane anchor for 3 heterologous antigens. Respective TolC fusion proteins encoded on plasmids were analysed for expression, functionality and plasmid stability in different engineered Salmonella strains. The amount of membrane localized recombinant TolC was enhanced in tolC-deficient strains. Furthermore, fusion proteins were functional and plasmid stability was very high in vitro and in vivo. Disappointingly, neither specific CD4+/CD8+ T-cell responses against the model antigen ovalbumin nor CD8+ responses against the cancer antigen BRAFV600E were detectable in murine model systems. However, mice immunized with Salmonella strains displaying an immunodominant epitope of the cancer related prostate specific antigen (PSA) were partially protected from subsequent tumour challenge with a PSA expressing melanoma cell line. Tumour growth in mice immunized with the respective strain was significantly decelerated compared to controls, thus indicating that this surface display system confers protective immunity against tumours. In a second study, the approved typhoid vaccine strain Salmonella enterica serovar Typhi Ty21a (Ty21a) was improved for the hemolysin type I secretion system of E. coli. This secretion system is widely used for heterologous antigen delivery in live bacterial vaccines. It was demonstrated throughout this work that a mutation of rpoS in Ty21a correlated with decreased ability for hemolysin secretion compared to other Salmonella strains. Complementation with rpoS or the presumed downstream target of rpoS, rfaH resulted in enhanced expression and secretion of heterologous hemolysin in Ty21a. Presumably by raising the amount of free antigen, rfaHcomplemented Ty21a elicited higher antibody titres against heterologous hemolysin in immunized mice than controls and even rpoS-positive Ty21a. Therefore, rfaHcomplemented Ty21a could form the basis of a novel generation of vaccines for human use based on (cancer) antigen secretion.
The yeast Candida albicans is a member of the normal microflora on the mucosal surfaces of the gastrointestinal and urogenital tract in healthy persons. However, it is an opportunistic pathogen that can cause a range of infections from superficial to disseminated, in response to perturbation of the normal microflora or alterations in the host immunity. C. albicans exhibits a variety of characteristics such as adhesion, morphogenetic switching and secreted aspartic protease production that contribute to its virulence. Expression of many of these virulence factors is controlled by the availability of essential element, nitrogen. C. albicans undergoes morphogenetic transition to form filaments under nitrogen starvation conditions and this switch is controlled by the ammonium permease Mep2p. However, little is known about how this signaling function of Mep2p is regulated. Mutational analysis of Mep2p was carried out to identify the residues that confer signaling activity to this permease. The C-terminal cytoplasmic tail of Mep2p contains a signaling domain that is dispensable for ammonium transport but essential for the signaling activity of Mep2p. In this work, progressive C-terminal truncations analysis demonstrated that a MEP2DC433 allele was still able to induce filamentation while nitrogen starvation-induced filamentous growth was abolished in cells expressing a MEP2DC432 allele. Therefore, tyrosine at position 433 (Y433) is the last amino acid in Mep2p that is essential for signaling. To gain insights into how the signaling activity of Mep2p is regulated by ammonium availability and transport, conserved residues that have been implicated in ammonium binding or uptake were mutated. Mutation of D180, which has been proposed to mediate initial contact with extracellular ammonium, or the pore-lining residues H188 and H342 abolished Mep2p expression, indicating that these residues are important for protein stability. Mutation of F239, which together with F126 is predicted to form an extracytosolic gate to the conductance channel, abolished both ammonium uptake and Mep2p-dependent filamentation, despite proper localization of the protein. On the other hand, mutation of W167, which is assumed to participate along with Y122, F126, and S243 in the recruitment and coordination of the ammonium ion at the extracytosolic side of the cell membrane, also abolished filamentation without having a strong impact on ammonium transport, demonstrating that extracellular alterations in Mep2p can affect intracellular signaling. Mutation of Y122 reduced ammonium uptake much more strongly than mutation of W167 but still allowed efficient filamentation, indicating that the signaling activity of Mep2p is not directly correlated with its transport activity. An important aspect in the ability of Mep2p to stimulate filamentation in response to nitrogen limitation is its high expression levels. The cis-acting sequences and trans-acting regulators that mediate MEP2 induction in response to nitrogen limitation were identified. Promoter analysis revealed that two putative binding sites for GATA transcription factors have a central role in MEP2 expression, as deletion of the region containing these sites or mutation of the GATAA sequences in the full-length MEP2 promoter strongly reduced MEP2 expression. To elucidate the roles of the GATA transcription factors GLN3 and GAT1 in regulating MEP2 expression, mutants lacking one or both of these transcription factors were constructed. Mep2p expression was strongly reduced in gln3D and gat1D single mutants and virtually abolished in gln3D gat1D double mutants. Deletion of GLN3 strongly inhibited filamentous growth under limiting nitrogen conditions, which could be rescued by constitutive expression of MEP2 from the ADH1 promoter. In contrast, inactivation of GAT1 had no effect on filamentation. Surprisingly, filamentation became partially independent of the presence of a functional MEP2 gene in the gat1D mutants, indicating that the loss of GAT1 function results in the activation of other pathways that induce filamentous growth. These findings demonstrated that the GATA transcription factors Gln3p and Gat1p control expression of the MEP2 ammonium permease and that GLN3 is also an important regulator of nitrogen starvation-induced filamentous growth in C. albicans. C. albicans mutants lacking both the GATA transcription factors Gln3p and Gat1p were unable to grow in a medium containing an alternative nitrogen source, bovine serum albumin (BSA) as the sole nitrogen source. The ability to utilize proteins as sole source of nitrogen for growth of C. albicans is conferred by the secreted aspartic protease Sap2p, which degrades the proteins, and oligopeptide transporters that mediate uptake of the proteolytic products into cell. The growth defect of gln3D gat1D mutants was mainly caused by their inability to express the SAP2 gene, as SAP2 expression from the constitutive ADH1 promoter restored the ability of the mutants to grow on BSA. Expression of STP1, which encodes a transcription factor that is required for SAP2 induction in the presence of proteins, was regulated by Gln3p and Gat1p. Forced expression of STP1 from a tetracycline-inducible promoter bypassed the requirement of the GATA transcription factors for growth of C. albicans on proteins. When preferred nitrogen sources are available, SAP2 is repressed and this nitrogen catabolite repression of SAP2 was correlated with downregulation of STP1 under these conditions. Tetracycline-induced STP1 expression abolished nitrogen catabolite repression of SAP2, demonstrating that regulation of STP1 expression levels by the GATA transcription factors is a key aspect of both positive and negative regulation of SAP2 expression. Therefore, by using a regulatory cascade in which expression of the specific transcription factor Stp1p is controlled by the general regulators Gln3p and Gat1p, C. albicans places SAP2 expression under nitrogen control and ensures proper expression of this virulence determinant. In summary, the present study illustrated how GATA factors, Gln3p and Gat1p, play partially overlapping, but distinct roles, in mediating the appropriate responses of C. albicans to the availability of different nitrogen sources. These responses are also determinants of pathogenicity of the fungus. The relative contributions of Gln3p and Gat1p vary with their target genes and the availability of nitrogen source. Overall, these findings provide us with a better understanding of the molecular basis of some of the important processes that help in adaptation of C. albicans to various environmental conditions. The yeast Candida albicans is a member of the normal microflora on the mucosal surfaces of the gastrointestinal and urogenital tract in healthy persons. However, it is an opportunistic pathogen that can cause a range of infections from superficial to disseminated, in response to perturbation of the normal microflora or alterations in the host immunity. C. albicans exhibits a variety of characteristics such as adhesion, morphogenetic switching and secreted aspartic protease production that contribute to its virulence. Expression of many of these virulence factors is controlled by the availability of essential element, nitrogen. C. albicans undergoes morphogenetic transition to form filaments under nitrogen starvation conditions and this switch is controlled by the ammonium permease Mep2p. However, little is known about how this signaling function of Mep2p is regulated. Mutational analysis of Mep2p was carried out to identify the residues that confer signaling activity to this permease. The C-terminal cytoplasmic tail of Mep2p contains a signaling domain that is dispensable for ammonium transport but essential for the signaling activity of Mep2p. In this work, progressive C-terminal truncations analysis demonstrated that a MEP2DC433 allele was still able to induce filamentation while nitrogen starvation-induced filamentous growth was abolished in cells expressing a MEP2DC432 allele. Therefore, tyrosine at position 433 (Y433) is the last amino acid in Mep2p that is essential for signaling. To gain insights into how the signaling activity of Mep2p is regulated by ammonium availability and transport, conserved residues that have been implicated in ammonium binding or uptake were mutated. Mutation of D180, which has been proposed to mediate initial contact with extracellular ammonium, or the pore-lining residues H188 and H342 abolished Mep2p expression, indicating that these residues are important for protein stability. Mutation of F239, which together with F126 is predicted to form an extracytosolic gate to the conductance channel, abolished both ammonium uptake and Mep2p-dependent filamentation, despite proper localization of the protein. On the other hand, mutation of W167, which is assumed to participate along with Y122, F126, and S243 in the recruitment and coordination of the ammonium ion at the extracytosolic side of the cell membrane, also abolished filamentation without having a strong impact on ammonium transport, demonstrating that extracellular alterations in Mep2p can affect intracellular signaling. Mutation of Y122 reduced ammonium uptake much more strongly than mutation of W167 but still allowed efficient filamentation, indicating that the signaling activity of Mep2p is not directly correlated with its transport activity. An important aspect in the ability of Mep2p to stimulate filamentation in response to nitrogen limitation is its high expression levels. The cis-acting sequences and trans-acting regulators that mediate MEP2 induction in response to nitrogen limitation were identified. Promoter analysis revealed that two putative binding sites for GATA transcription factors have a central role in MEP2 expression, as deletion of the region containing these sites or mutation of the GATAA sequences in the full-length MEP2 promoter strongly reduced MEP2 expression. To elucidate the roles of the GATA transcription factors GLN3 and GAT1 in regulating MEP2 expression, mutants lacking one or both of these transcription factors were constructed. Mep2p expression was strongly reduced in gln3D and gat1D single mutants and virtually abolished in gln3D gat1D double mutants. Deletion of GLN3 strongly inhibited filamentous growth under limiting nitrogen conditions, which could be rescued by constitutive expression of MEP2 from the ADH1 promoter. In contrast, inactivation of GAT1 had no effect on filamentation. Surprisingly, filamentation became partially independent of the presence of a functional MEP2 gene in the gat1D mutants, indicating that the loss of GAT1 function results in the activation of other pathways that induce filamentous growth. These findings demonstrated that the GATA transcription factors Gln3p and Gat1p control expression of the MEP2 ammonium permease and that GLN3 is also an important regulator of nitrogen starvation-induced filamentous growth in C. albicans. C. albicans mutants lacking both the GATA transcription factors Gln3p and Gat1p were unable to grow in a medium containing an alternative nitrogen source, bovine serum albumin (BSA) as the sole nitrogen source. The ability to utilize proteins as sole source of nitrogen for growth of C. albicans is conferred by the secreted aspartic protease Sap2p, which degrades the proteins, and oligopeptide transporters that mediate uptake of the proteolytic products into cell. The growth defect of gln3D gat1D mutants was mainly caused by their inability to express the SAP2 gene, as SAP2 expression from the constitutive ADH1 promoter restored the ability of the mutants to grow on BSA. Expression of STP1, which encodes a transcription factor that is required for SAP2 induction in the presence of proteins, was regulated by Gln3p and Gat1p. Forced expression of STP1 from a tetracycline-inducible promoter bypassed the requirement of the GATA transcription factors for growth of C. albicans on proteins. When preferred nitrogen sources are available, SAP2 is repressed and this nitrogen catabolite repression of SAP2 was correlated with downregulation of STP1 under these conditions. Tetracycline-induced STP1 expression abolished nitrogen catabolite repression of SAP2, demonstrating that regulation of STP1 expression levels by the GATA transcription factors is a key aspect of both positive and negative regulation of SAP2 expression. Therefore, by using a regulatory cascade in which expression of the specific transcription factor Stp1p is controlled by the general regulators Gln3p and Gat1p, C. albicans places SAP2 expression under nitrogen control and ensures proper expression of this virulence determinant. In summary, the present study illustrated how GATA factors, Gln3p and Gat1p, play partially overlapping, but distinct roles, in mediating the appropriate responses of C. albicans to the availability of different nitrogen sources. These responses are also determinants of pathogenicity of the fungus. The relative contributions of Gln3p and Gat1p vary with their target genes and the availability of nitrogen source. Overall, these findings provide us with a better understanding of the molecular basis of some of the important processes that help in adaptation of C. albicans to various environmental conditions.