TY - JOUR
A1 - Ondrusch, Nicolai
A1 - Kreft, Jürgen
T1 - Blue and Red Light Modulates SigB-Dependent Gene Transcription, Swimming Motility and Invasiveness in Listeria monocytogenes
N2 - Background: In a number of gram-positive bacteria, including Listeria, the general stress response is regulated by the alternative sigma factor B (SigB). Common stressors which lead to the activation of SigB and the SigB-dependent regulon are high osmolarity, acid and several more. Recently is has been shown that also blue and red light activates SigB in Bacillus subtilis. Methodology/Principal Findings: By qRT-PCR we analyzed the transcriptional response of the pathogen L. monocytogenes to blue and red light in wild type bacteria and in isogenic deletion mutants for the putative blue-light receptor Lmo0799 and the stress sigma factor SigB. It was found that both blue (455 nm) and red (625 nm) light induced the transcription of sigB and SigB-dependent genes, this induction was completely abolished in the SigB mutant. The blue-light effect was largely dependent on Lmo0799, proving that this protein is a genuine blue-light receptor. The deletion of lmo0799 enhanced the red-light effect, the underlying mechanism as well as that of SigB activation by red light remains unknown. Blue light led to an increased transcription of the internalin A/B genes and of bacterial invasiveness for Caco-2 enterocytes. Exposure to blue light also strongly inhibited swimming motility of the bacteria in a Lmo0799- and SigB-dependent manner, red light had no effect there. Conclusions/Significance: Our data established that visible, in particular blue light is an important environmental signal with an impact on gene expression and physiology of the non-phototrophic bacterium L. monocytogenes. In natural environments these effects will result in sometimes random but potentially also cyclic fluctuations of gene activity, depending on the light conditions prevailing in the respective habitat.
KW - Listeria monocytogenes
Y1 - 2011
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-75451
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Goebel, Werner
T1 - Complex Co1E1 DNA in Escherichia coli and Proteus mirabilis
N2 - Incubation of the colicinogenic Escherichia coli strain JC 411 (ColE1) at elevated temperatures (47-49°) leads to the accumulation of catenated molecules and replicative intermediates of this plasmid. Mature supercoiled OolE1 DNA molecules synthesized under these conditions have an increased number of tertiary turns as shown by electron microscopy. The monomeric tightly supercoiled molecules possess a slightly slower sedimentation rate and a higher binding capacity for ethidium bromide than supercoiJed monomers synthesized at lower temperatures. Recombination deficient mutants of E. coli recA, recB and recC, which carry the ColE1 plasmid, form about the same amount of catenated molecules at the elevated temperature as a rec+ strain. In addition, we have observed by electron microscopy a small percentage (.--.5% of the circular DNA molecules) of minicircular DNA molecules in all preparations of JC 411 (CoIE1). They are homogenous in size, with a molecular weight of 1.4 X 106 daltons. Addition of chloramphenicol to a culture of Proteus mirabilis (ColE1) leads to an increased amount of higher multiple circular oligomers and to a stimulated accumulation of catenated OolE1 DNA molecules of varying sizes. ColE1 DNA synthesis is more thermosensitive than chromosomal DNA replication in P. mirabili8. Plasmid replication stops completely at temperatures above 43°C.
Y1 - 1974
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-47044
ER -
TY - JOUR
A1 - Kreft, Jürgen
T1 - Reovirus-specific messenger ribonucleoprotein particles from Hela cells
N2 - When reovirus-infected Hela cells are incubated at 43°C virus-specific messenger RNA is released ~rom the polysomes. It accumulates free in the cytoplasm as messenger ribonucleoprotem partIcles (mRNPs). The:e part~cles have a sedimentati~n rate of about 50S and a buoyant densIty m CsCI of 1.42 g/cm . ReovIrus mRNPs contam, beSIdes all three size classes of reovirus messenger RNA, the same spectrum of proteins found in the polysomal mRNPs from uninfected cells, plus t~o addi~ional pr?teins with molecular masses of 7000~ d and 110000 d, respectively. Electron mIcroscoPIc exammatlOn of the reovIrus mRNP fractIOn reveals specific Y-shaped structures wIth a total mean length ofO.5Ilm.
KW - Hela Cells
KW - Reovirus
KW - Messenger Ribonucleoprotein Particles
KW - mRNP-Proteins
KW - Electron Microscopy
Y1 - 1980
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-47028
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Bernhard, K.
A1 - Goebel, Werner
T1 - Recombinant plasmids capable to replication in B. subtilis and E. coli
N2 - The plasmid pBC16 (4.25 kbases), ongtnally isolated from Bacillus cereus, determines tetracycline resistance and can be transformed into competent cells of B. subtilis. A miniplasmid of pBCl6 (pBCI6-1), 2,7 kb) which has lost an EcoRI fragment of pBCI6 retains the replication functions and the tetracycline resistance. This plasmid which carries only one EcoRI site has been joined in vitro to pBS], a cryptic plasmid previously isolated from B. subtilis and shown to carry also a single EcoRI site (Bernhard et aI., 1978). The recombinant plasmid is unstable and dissociates into the plasmid pBSl61 (8.2 kb) and the smaller plasmid pBS162 (2. I kb). Plasmid pBS161 retains the tetracycline resistance. It possesses a single EcoRI site and 6 HindlII sites. The largest HindIII fragment of pBS161 carries the tetracycline resistance gene and the replication function. After circularization in vitro of this fragment a new plasmid, pBS161-l is generated, which can be used as a HindlII and EcoRI cloning vector in Bacillus suhtilis. Hybrid plasmids consisting of the E. coli plasmids pBR322, p WL 7 or pACl84 and different HindlII fragments of pBSI61 were constructed in vitro. Hybrids containing together with the E. coli plasmid the largest HindlII fragment of pBS161 can replicate in E. coli and B. sublilis. In E. coli only the replicon of the E. coli plasmid part is functioning whereas in B. suhtilis replication of the hybrid plasmid is under the control of the Bacillus replicon. The tetracycline resistance of the B. subtilis plasmid is expressed in E. coli, but several antibiotic resistances of the E. coli plasmids (ampicillin, kanamycin and chloramphenicol) are not expressed in B. suhtilis. The hybrid plasmids seem to be more unstable in B. subtilis than in E. coli.
Y1 - 1978
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-47000
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Hughes, Colin
T1 - Cloning vectors derived from plasmids and phage of Bacillus
N2 - No abstract available
Y1 - 1982
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-47014
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Funke, D.
A1 - Schlesinger, R.
A1 - Lottspeich, F.
A1 - Goebel, Werner
T1 - Purification and characterization of cytolysins from Listeria monocytogenes serovar 4b and Listeria ivanovii
N2 - Several exoproteins from Listeria monocytogenes serovar 4b (NCTC 10527) and Listeria ivanovii (ATCC) 19119, SLCC 2379), respectively, have been purified to homogeneity by thiol-disulfide exchange chromatography and gel filtration. Both strains produce a haemolytic/cytolytic protein of Mr 58 kDa, which has all the properties of a SH-activated cytolysin, the prototype of which is streptolysin 0 (SLO), and this protein has therefore heen termed Iisteriolysin 0 (LLO). In addition a protein of Mr 24 kDa from culture supernatants of L. ivanovii co-purified withLLO. The N-terminal aminoacid sequences of both proteins from L. ivanovii have been determined. By mutagenesis with transposons of Gram-positive origin (Tn916 and TnI545), which have been introduced via conjugation into L. ivanovii, several phenotypic mutants (altered haemolysis on sheep blood agar or lecithinase-negative) were obtained. Results on the properties of these muntants will he presented.
Y1 - 1989
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-47036
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Haas, Albert
A1 - Goebel, Werner
T1 - Isolation and characterization of genes coding for proteins involved in the cytolysis by Listeria ivanovii
N2 - We established a library of chromosomal DNA of Listeria ivanovii in the pTZ19R plasmid system, using Escherichia coli DH5alpha as the host. One recombinant clone reacted strongly with a polyclonal antiserum raised against the listeriolysin 0 and a second exoprotein (24kDa) of L. ivanovii, which is most probably also involved in cytolytic processes. The recombinant E. coli clone may contain part of the listeriolysin 0 gene of L. ivanovii.
Y1 - 1989
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-46991
ER -
TY - JOUR
A1 - Lampidis, Robert
A1 - Gross, Roy
A1 - Sokolovic, Zeljka
A1 - Goebel, Werner
A1 - Kreft, Jürgen
T1 - The virulence regulator protein of Listeria ivanovii is highly homologous to PrfA from Listeria monocytogenes and both belong to the Crp-Fnr family of transcription regulators
N2 - No abstract available
KW - Biologie
Y1 - 1994
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60503
ER -
TY - JOUR
A1 - Brehm, Klaus
A1 - Haas, Albert
A1 - Goebel, Werner
A1 - Kreft, Jürgen
T1 - A gene encoding a superoxide dismutase of the facultative intracellular bacterium Listeria monocytogenes
N2 - A gene (Imsod) encoding superoxide dismutase (SOD; EC 1.15.1.1) of the facultative intracellular pathogen, Listeria monocytogenes, was cloned by functional complementation of an SOD-deficient Escherichia coli mutant. The nucleotide sequence was determined and the deduced amino acid (aa) sequence (202 aa) showed close similarity to manganese-containing SOD's from other organisms. Subunits of the recombinant L. monocytogenes SOD (re-SOD) and of both E. coli SODs formed enzymatically active hybrid enzymes in vivo. DNA/DNA-hybridization experiments showed that this type of recombinant re-sod gene is conserved within the genus Listeria.
KW - Biologie
Y1 - 1992
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60515
ER -
TY - JOUR
A1 - Haas, Albert
A1 - Dumbsky, Martina
A1 - Kreft, Jürgen
T1 - Listeriolysin genes: complete sequence of ilo from Listeria ivanovii and of lso from Listeria seeligeri
N2 - The completc DNA scqucnccs coding for thc thiol-activated cytolysins from Listeria ivanovii, ivanolysin 0 (ILO) and for sccligerolysin 0 (LSO) from Listeria seeligeri have been dctermined. Thc deduced amino acid scquences revealed that: (i) the primary translation products comprise 528 (ILO) and 530 (LSO) amino acids. respectively. (ii) ILO contains two cysteines. LSO has a substitution in the conserved cysteine motif.
KW - Biologie
KW - Thiol-activated cytolysin
KW - Listeriolysin O
KW - Cysteine: motif
KW - ( L. ivanovii )
KW - ( L. selligeri)
Y1 - 1992
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60529
ER -
TY - JOUR
A1 - Haas, Albert
A1 - Brehm, Klaus
A1 - Kreft, Jürgen
A1 - Goebel, Werner
T1 - Cloning, characterization, and expression in Escherichia coli of a gene encoding Listeria seeligeri catalase, a bacterial enzyme highly homologous to mammalian catalases
N2 - A gene coding for catalase (hydrogen-peroxide:hydrogen-peroxide oxidoreductase; EC 1.11.1.6) of the grain-positive bacterium Listeria seeligeri was cloned from a plasmid library of EcoRI-digested chromosomal DNA, with Escherichia coli DHSa as a host. The recombinant catalase was expressed in E. coli to an enzymatic activity approximately SO times that of the combined E. coli catalases. The nucleutide sequence was determined, and the deduced amino acid sequence revealed 43.2% amino acid sequence identity between bovine liver catalase and L. seeligeri catalase. Most of the amino acid residues which are involved in catalytic activity, the formation of the active center accession channel, and heme binding in bovine liver catalase were also present in L. seeligeri catalase at the corresponding positions. The recombinant protein contained 488 amino acid residues and had a calculated molecular weight of 55,869. The predicted isoelectric point was 5.0. Enzymatic and genetic analyses showed that there is most probably a single catalase of this type in L. seeligeri. A perfect 21-bp inverted repeat, which was highly homologous to previously reported binding sequences of the Fur (ferric uptake regulon) protein of E. coli, was detected next to the putative promoter region of tbe L. seeligeri catalase gene.
KW - Biologie
Y1 - 1991
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60536
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Burger, Klaus J.
A1 - Goebel, Werner
T1 - Expression of antibiotic resistance genes from Escherichia coli in Bacillus subtilis
N2 - Bifunctional recombinant plasmids were constructed, comprised of the E. coli vectors pBR322, pBR325 and pACYC184 and different plasmids from Gram-positive bacteria, e.g. pBSU161-1 of B. subtilis and pUB110 and pC221 of S. aureus. The beta-lactamase (bla) gene and the chloramphenicol acetyltransferase (cat) gene from the E. coli plasmids were not transcribed and therefore not expressed in B. subtilis. However, tetracycline resistance from the E. coli plasmids was expressed in B. subtilis. Transcription of the tetracycline resistance gene(s) started in B. subtilis at or near the original E. coli promoter, the sequence of which is almost identical with the sequence recognized by σ55 of B. subtilis RNA polymerase.
KW - Biologie
Y1 - 1983
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60600
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Berger, Harald
A1 - Härtlein, Michael
A1 - Müller, Bodo
A1 - Weidinger, Gerhard
A1 - Goebel, Werner
T1 - Cloning and expression in Escherichia coli and Bacillus subtilis of the hemolysin (cereolysin) determinant from Bacillus cereus
N2 - From a cosmid gene bank of Bacillus cereus GP4 in Escherichia coli we isolated clones which, after several days of incubation, formed hemolysis zones on erythrocyte agar plates. These clones contained recombinant cosmids with B. cereus DNA insertions of varying lengths which shared some common restriction fragments. The smallest insertionwas recloned as aPstl fragment into pJKK3-1, a shuttle vector which repücates in Bacillus subtilis and E. coli. When this recombinant plasmid (pJKK3-1 hly-1) was transformed into E. coli, it caused hemolysis on erythrocyte agar plates, but in liquid assays no extemal or intemal hemolytic activity could be detected with the E. coli transformants. B. subtilis carrying the same plasmid exhibited hemolytic activity at Ievels comparable to those ofthe B. cereus donor strain. The hemolysin produced in B. subtilis seemed to be indistinguishable from cereolysin in its sensitivity to cholesterol, activation by dithiothreitol, and inactivation by antibodies raised against cereolysin. When the recombinant DNA carrying the cereolysin gene was used as a probe in hybridization experiments with chromosomal DNA from a streptolysin 0-producing strain of Streptococcus pyogenes or from üsteriolysin-producing strains of Usteria monoeytogenes, no positive hybridization signals were obtained. These data soggest that the genes for these three SH-activated cytolysins do not have extended sequence homology.
KW - Biologie
Y1 - 1983
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60596
ER -
TY - JOUR
A1 - Kreft, Jürgen
A1 - Funke, Dorothee
A1 - Haas, Albert
A1 - Lottspeich, Friedrich
A1 - Goebel, Werner
T1 - Production, purification and characterization of hemolysins from Listeria ivanovii and Listeria monocytogenes Sv4b.
N2 - In culture supematants of both Listeria ivanovii and Listeria monocytogenes Sv4b, for the first time a hemolysin of molecular weight 58 kDa was identified, which had all the characteristics of an SH-activated cytolysin, and which was therefore identified as Iisteriolysin 0 (LLO). In the case of L. ivanovii a second major supematant protein of molecular weight 24 kDa co-purified with LLO. However, the function of this protein has to be determined. In culture supematants of L. ivanovii a sphingomyelinase and a Iecithinase activity could be detected, both enzymatic activities together contributing to the pronounced hemolysis caused by L. ivanovii. The N-tenninal amino acid sequences of LLO and the 24 kDa from L. ivanovii are shown.
KW - Biologie
KW - Hemolysin
KW - Listeria
Y1 - 1989
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60545
ER -
TY - JOUR
A1 - Goebel, Werner
A1 - Chakraborty, T.
A1 - Kreft, Jürgen
T1 - Bacterial hemolysins as virulence factors
N2 - No abstract available
KW - Biologie
Y1 - 1988
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60553
ER -
TY - JOUR
A1 - Goebel, Werner
A1 - Kathariou, S.
A1 - Kuhn, M.
A1 - Sokolovic, Z.
A1 - Kreft, Jürgen
A1 - Köhler, S.
A1 - Funke, D.
A1 - Chakraborty, T.
A1 - Leimeister-Wächter, M.
T1 - Hemolysin from Listeria-biochemistry, genetics and function in pathogenesis
N2 - No abstract available
KW - Biologie
Y1 - 1988
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60563
ER -
TY - JOUR
A1 - Schülein, Ralf
A1 - Kreft, Jürgen
A1 - Gonski, Sigrid
A1 - Goebel, Werner
T1 - Preprosubtilisin Carlsberg processing and secretion is blocked after deletion of amino acids 97-101 in the mature part of the enzyme
N2 - During an investigation into the substrate specificity and processing of subtilisin Carlsberg from Bacillus licheniformis, two major independent findings were made: (i) as has been shown previously, a stretch of five amino acids (residues 97-101 of the mature enzyme) that loops out into the binding cleft is involved in substrate binding by subtilisin Carlsberg. In order to see whether this loop element also determines substrate specificity, the coding region for these five amino acids was deleted from the cloned gene for subtilisin Carlsberg by site-directed mutagenesis. Unexpectedly the resulting mutant preproenzyme (P42c, Mr=42 kDa) was not processed to the mature form (Mr = 30 kDa) and was not released into the medium by a proteasedeficient B. subtilis host strain; rather, it accumulated in the cell membrane. This result demonstrates that the integrity of this loop element, which is very distant from the processing cleavage sites in the preproenzyme, is required for secretion of subtilisin Carlsberg. (ii) In culture supernatants from B. subtilis harbouring the cloned wild-type subtilisin Carlsberg gene the transient appearance (at 0-3 h after onset of stationary phase) of a processing intermediate (P38c, Mr = 38 kDa) oftbis protease could be demonstrated. P38c very probably represents a genuine proform of subtilisin Carlsberg.
KW - Biologie
KW - Bacillus
KW - Proenzyme
KW - Subtilisin maturation
KW - Site-directed mutagenesis
KW - Subtilisin Carlsberg
Y1 - 1991
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60577
ER -
TY - JOUR
A1 - Gilmore, Michael S.
A1 - Cruz-Rodz, Armando L.
A1 - Leimeister-Wächter, Michaela
A1 - Kreft, Jürgen
A1 - Goebel, Werner
T1 - A Bacillus cereus cytolytic determinant, cereolysin AB, which comprises the phospholipase C and sphingomyelinase genes: nucleotide sequence and genetic linkage
N2 - A cloned cytolytic determinant from the genome of Bacillus cereus GP-4 has been characterized at the molecular Ievel. Nucleotide sequence determination revealed the presence of two open reading frames. 8oth open reading frames were found by deletion and complementation analysis to be necessary for expression of the hemolytic phenotype by Bacillus subtilis and Escherichia coli hosts. The 5' open reading frame was found to be nearly identical to a recently reported phospholipase C gene derived from a mutant B. cereus strain which overexpresses the respective protein, and it conferred a lecithinase-positive phenotype to the B. subtilis host. The 3' open reading frame encoded a sphingomyelinase. The two tandemly encoded activities, phospholipase C and sphingomyelinase, constitute a biologically functional cytolytic determinant of B. cereus termed cereolysin AB.
KW - Biologie
Y1 - 1989
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60588
ER -
TY - JOUR
A1 - Härtlein, Michael
A1 - Schiessl, Sigrid
A1 - Wagner, Wilma
A1 - Rdest, Ursula
A1 - Kreft, Jürgen
A1 - Goebel, Werner
T1 - Transport of hemolysin by Escherichia coli
N2 - No abstract available
KW - Biologie
KW - Hemolysin
KW - Escberichia coli
KW - Gene cloning
KW - Expression
KW - Transport
Y1 - 1983
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60619
ER -
TY - JOUR
A1 - Goebel, Werner
A1 - Kreft, Jürgen
T1 - Accumulation of replicative intermediates and catenated forms of the colicinogenic factor E\(_1\) in E. coli during the replication at elevated temperatures
N2 - No abstract available
KW - Biologie
Y1 - 1972
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-60625
ER -
TY - JOUR
A1 - Ondrusch, Nicolai
A1 - Kreft, Jürgen
T1 - Blue and Red Light Modulates SigB-Dependent Gene Transcription, Swimming Motility and Invasiveness in \(Listeria\) \(monocytogenes\)
JF - PLoS ONE
N2 - Background:
In a number of gram-positive bacteria, including Listeria, the general stress response is regulated by the alternative sigma factor B (SigB). Common stressors which lead to the activation of SigB and the SigB-dependent regulon are high osmolarity, acid and several more. Recently is has been shown that also blue and red light activates SigB in Bacillus subtilis.
Methodology/Principal Findings:
By qRT-PCR we analyzed the transcriptional response of the pathogen L. monocytogenes to blue and red light in wild type bacteria and in isogenic deletion mutants for the putative blue-light receptor Lmo0799 and the stress sigma factor SigB. It was found that both blue (455 nm) and red (625 nm) light induced the transcription of sigB and SigB-dependent genes, this induction was completely abolished in the SigB mutant. The blue-light effect was largely dependent on Lmo0799, proving that this protein is a genuine blue-light receptor. The deletion of lmo0799 enhanced the red-light effect, the underlying mechanism as well as that of SigB activation by red light remains unknown. Blue light led to an increased transcription of the internalin A/B genes and of bacterial invasiveness for Caco-2 enterocytes. Exposure to blue light also strongly inhibited swimming motility of the bacteria in a Lmo0799- and SigB-dependent manner, red light had no effect there.
Conclusions/Significance:
Our data established that visible, in particular blue light is an important environmental signal with an impact on gene expression and physiology of the non-phototrophic bacterium L. monocytogenes. In natural environments these effects will result in sometimes random but potentially also cyclic fluctuations of gene activity, depending on the light conditions prevailing in the respective habitat.
KW - Gram-positive bacteria
KW - Sigma(B)-dependent stress-response
KW - Non-phototrophic bacteria
KW - Prfa-mediated virulence
KW - NTP-binding-properties
KW - Bacillus-subtilis
KW - Receptor ytva
KW - Lov domain
KW - Factor sigma(B)
Y1 - 2011
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-134050
VL - 6
IS - 1
ER -