title: Shishijimicins A-C, novel enediyne antitumor antibiotics from the ascidian Didemnum proliferum(1).
abstract: Three new compounds of the enediyne antibiotics, shishijimicins A-C (1-3), have been isolated from the ascidian Didemnum proliferum. They encompass a novel sugar component, which is a conjugation product of a hexose and a beta-carboline, attached to the calicheamicinone aglycone. Their structures have been determined by interpretation of spectral data. Shishijimicins showed extremely potent cytotoxicity against HeLa cells with IC(50) values of 1.8-6.9 pM.
authors.affiliation: Laboratory of Aquatic Natural Products Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Oku
authors.forename: Shigeki
authors.initials: S
authors.lastname: Matsunaga
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Fusetani
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D002243:Carbolines / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D004187:Disaccharides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D053281:Enediynes; D006367:HeLa Cells; D006801:Humans; D007941:Leukemia P388 / Q000188:drug therapy; D014561:Urochordata / Q000737:chemistry*
chemical_list: D000903:Antibiotics, Antineoplastic; D002243:Carbolines; D004187:Disaccharides; D053281:Enediynes; C472755:Shishijimicin A; C472753:Shishijimicin B; C472754:Shishijimicin C