Structure-related cytotoxic activity of derivatives from kulokekahilide-2, a cyclodepsipeptide in Hawaiian marine mollusk

Masahiro Umehara, Takayuki Negishi, Tomoko Tashiro, Youichi Nakao, Junji Kimura

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    10 Citations (Scopus)


    Kulokekahilide-2, a 26-membered cyclodepsipeptide, was isolated from Hawaiian marine mollusk and possessed potent cytotoxicity in mammalian tumor cells. In the present study, we synthesized kulokekahilide-2 and its derivatives and examined the structure-activity relationships of these peptides in human cancer cells (A549, K562, and MCF7 cells). This study demonstrated that the cyclization of depsipeptide and the chirality of the 21 position in Ala in kulokekahilide-2 were important for its cytotoxic property and that addition of halogen at the para position of phenyl group in the 24-d-MePhe in kulokekahilide-2 as well as some derivatives remarkably increased their cytotoxicity in human cancer cells. These results suggest that the modifications of 24-d-MePhe in kulokekahilide-2, preserving its cyclization and the chirality at the 21-position, are promising strategy for exploring new derivative of kulokekahilide-2 as anti-tumor drug.

    Original languageEnglish
    Pages (from-to)7422-7425
    Number of pages4
    JournalBioorganic and Medicinal Chemistry Letters
    Issue number24
    Publication statusPublished - 2012 Dec 15



    • Cyclodepsipeptide
    • Cytotoxic activity
    • Kulokekahilide-2
    • Structure-activity relationship

    ASJC Scopus subject areas

    • Pharmaceutical Science
    • Drug Discovery
    • Organic Chemistry
    • Molecular Medicine
    • Molecular Biology
    • Clinical Biochemistry
    • Biochemistry

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