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Mollamides B and C, Cyclic hexapeptides from the indonesian tunicate Didemnum molle.

ABSTRACT: Two new cyclic hexapeptides, mollamides B (1) and C (2), were isolated from the Indonesian tunicate Didemnum molle along with the known peptide keenamide A (3). The structures were established using 1D and 2D NMR experiments. The relative configuration of mollamide B at the thiazoline moiety was determined using molecular modeling coupled with NMR-derived restraints. Their absolute configuration was determined using Marfey's method. The new peptides have been evaluated for their antimicrobial, antimalarial, anticancer, anti-HIV-1, anti-Mtb, and anti-inflammatory activities. Keenamide A and mollamide B show cytotoxicity against several cancer cell lines.

SUBMITTER: Donia MS

PROVIDER: S-EPMC2651694 | biostudies-other | 2008 Jun

REPOSITORIES: biostudies-other

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