@article{AbdelmohsenPimentelElardoHanoraetal.2010,
  author    = {Abdelmohsen, Usama Ramadan and Pimentel-Elardo, Sheila M. and Hanora, Amro and Radwan, Mona and Abou-El-Ela, Soad H. and Ahmed, Safwat and Hentschel, Ute},
  title     = {Isolation, Phylogenetic Analysis and Anti-infective Activity Screening of Marine Sponge-Associated Actinomycetes},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-68307},
  year      = {2010},
  abstract  = {Terrestrial actinomycetes are noteworthy producers of a multitude of antibiotics, however the marine representatives are much less studied in this regard. In this study, 90 actinomycetes were isolated from 11 different species of marine sponges that had been collected from offshore Ras Mohamed (Egypt) and from Rovinj (Croatia). Phylogenetic characterization of the isolates based on 16S rRNA gene sequencing supported their assignment to 18 different actinomycete genera representing seven different suborders. Fourteen putatively novel species were identified based on sequence similarity values below 98.2\% to other strains in the NCBI database. A putative new genus related to Rubrobacter was isolated on M1 agar that had been amended with sponge extract, thus highlighting the need for innovative cultivation protocols. Testing for anti-infective activities was performed against clinically relevant, Gram-positive (Enterococcus faecalis, Staphylococcus aureus) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) bacteria, fungi (Candida albicans) and human parasites (Leishmania major, Trypanosoma brucei). Bioactivities against these pathogens were documented for 10 actinomycete isolates. These results show a high diversity of actinomycetes associated with marine sponges as well as highlight their potential to produce anti-infective agents.},
  subject      = {Biologie},
  language  = {en}
}
@article{PimentelElardoKozytskaBugnietal.2010,
  author    = {Pimentel-Elardo, Sheila Marie and Kozytska, Svitlana and Bugni, Tim S. and Ireland, Chris M. and Moll, Heidrun and Hentschel, Ute},
  title     = {Anti-Parasitic Compounds from Streptomyces sp. Strains Isolated from Mediterranean Sponges},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-68312},
  year      = {2010},
  abstract  = {Actinomycetes are prolific producers of pharmacologically important compounds accounting for about 70\% of the naturally derived antibiotics that are currently in clinical use. In this study, we report on the isolation of Streptomyces sp. strains from Mediterranean sponges, on their secondary metabolite production and on their screening for anti-infective activities. Bioassay-guided isolation and purification yielded three previously known compounds namely, cyclic depsipeptide valinomycin, indolocarbazole alkaloid staurosporine and butenolide. This is the first report of the isolation of valinomycin from a marine source. These compounds exhibited novel anti-parasitic activities specifically against Leishmania major (valinomycin IC50 < 0.11 μM; staurosporine IC50 5.30 μM) and Trypanosoma brucei brucei (valinomycin IC50 0.0032 μM; staurosporine IC50 0.022 μM; butenolide IC50 31.77 μM). These results underscore the potential of marine actinomycetes to produce bioactive compounds as well as the re-evaluation of previously known compounds for novel anti-infective activities.},
  subject      = {Biologie},
  language  = {en}
}