The antibacterial ent-eusynstyelamide B and eusynstyelamides D, E, and F from the Arctic bryozoan Tegella cf. spitzbergensis

The brominated tryptophan-derived ent-eusynstyelamide B (1) and three new derivatives, eusynstyelamides D, E, and F (2−4), were isolated from the Arctic bryozoan Tegella cf. spitzbergensis. The structures were elucidated by spectroscopic methods including 1D and 2D NMR and analysis of mass spectrome...

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Bibliographic Details
Main Authors: Tadesse, Marg, Tabudravu, Jioji N., Jaspars, Marcel, Str, Morten B., Hansen, Espen, Andersen, Jeanette Hammer, Kristiansen, Per E., Haug, Tor
Format: Article in Journal/Newspaper
Language:unknown
Published: ACS Publications 2011
Subjects:
QD Chemistry
Arctic
Online Access:http://repository.usp.ac.fj/9904/
http://pubs.acs.org/doi/abs/10.1021/np100499c
Description
Summary:The brominated tryptophan-derived ent-eusynstyelamide B (1) and three new derivatives, eusynstyelamides D, E, and F (2−4), were isolated from the Arctic bryozoan Tegella cf. spitzbergensis. The structures were elucidated by spectroscopic methods including 1D and 2D NMR and analysis of mass spectrometric data. The enantiomer of 1, eusynstyelamide B, has previously been isolated from the Australian ascidian Eusynstyela latericius. Antimicrobial activities are here reported for 1−4, with minimum inhibitory concentrations (MIC) as low as 6.25 μg/mL for 1 and 4 against Staphylococcus aureus. Eusynstyelamides 2 and 3 showed weak cytotoxic activity against the human melanoma A 2058 cell line.

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