Abstract
A Tripterygium wilfordii endophyte, Streptomyces sp. CB04723, was shown to produce an unusually highly reduced cytotoxic cinnamoyl lipid, tripmycin A (1). Structure-activity relationship studies revealed that both the cinnamyl moiety and the saturated fatty acid side chain are indispensable to the over 400-fold cytotoxicity improvement of 1 against the triple-negative breast cancer cell line MDA-MB-231 compared to 5-(2-methylphenyl)-4-pentenoic acid (2). Bioinformatical analysis, gene inactivation, and overexpression revealed that Hxs15 most likely acted as an enoyl reductase and was involved with the side chain reduction of 1, which provides a new insight into the biosynthesis of cinnamoyl lipids.
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