title: Microcyclamide, a cytotoxic cyclic hexapeptide from the cyanobacterium Microcystis aeruginosa.
abstract: Microcyclamide (1), a cytotoxic cyclic hexapeptide, was isolated from the cultured cyanobacterium Microcystis aeruginosa (NIES-298). Its structure was elucidated to be 1 on the basis of two-dimensional (1)H-(1)H, (1)H-(13)C, and (1)H-(15)N NMR correlation experiments and the HRFABMS measurement. The absolute stereochemistry of the asymmetric centers was determined by the Marfey's method. This peptide showed a moderate cytotoxicity against P388 murine leukemia cells.
authors.affiliation: Laboratory of Marine Biochemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ishida
authors.forename: H
authors.initials: H
authors.lastname: Nakagawa
authors.forename: M
authors.initials: M
authors.lastname: Murakami
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D051379:Mice; D046931:Microcystis / Q000737:chemistry*; D009842:Oligopeptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D010456:Peptides, Cyclic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D011487:Protein Conformation; D013057:Spectrum Analysis; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D009842:Oligopeptides; D010456:Peptides, Cyclic; C417936:microcyclamide