Mebamamides A and B, Cyclic Lipopeptides Isolated from the Green Alga Derbesia marina
Arihiro Iwasaki1, Osamu Ohno1, Shinpei Sumimoto1
1†Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku Yokohama, Kanagawa 223-8522, Japan.
Abstract:
Mebamamides A and B, new lipopeptides with four d-amino acid residues and a 3,8-dihydroxy-9-methyldecanoic acid residue, were isolated from the green alga Derbesia marina. Their gross structures were elucidated by spectroscopic and ESI-ITMS analyses. The absolute configurations except for the two leucines were revealed based on chiral-phase HPLC analyses of the acid hydrolysate and a modified Mosher's method. A distinction between D-Leu and L-Leu in the sequence was established by the application of a dansyl-Edman method to the partial acid hydrolysate. Mebamamide A did not exhibit any growth inhibitory activity against HeLa and HL60 cells at 10 μM, and mebamamide B did not exhibit any growth inhibitory activity against those cells at 100 μM. Additionally, it was suggested that mebamamide B induced the differentiation of HL60 cells into macrophage-like cells at 100 μM.
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