title: IB-01212, a new cytotoxic cyclodepsipeptide isolated from the marine fungus Clonostachys sp. ESNA-A009.
abstract: IB-01212, a new cytotoxic cyclodepsipeptide featuring C2 symmetry, was isolated from the mycelium extract of Clonostachys sp. ESNA-A009. The amino acid sequence of the compound was determined by spectroscopy techniques. The absolute configuration of the amino acids was determined by a combination of the Marfey and menthol methods. The structure, which was confirmed by comparison of the analytical data for the natural product with a sample obtained by solid-phase peptide synthesis, was revealed to be a cyclic dimer formed by two chains of L-N,N-Me2Leu-L-Ser-L-N-MeLeu-L-N-MePhe bound by the two esters formed between the carboxylic acid of the L-N-MePhe and the hydroxyl function of the L-Ser. IB-01212 is highly cytotoxic to different tumor cell lines.
authors.affiliation: Barcelona Biomedical Research Institute, Barcelona Science Park, University of Barcelona, 08028-Barcelona, Spain.
authors.forename: Luis J
authors.initials: LJ
authors.lastname: Cruz
authors.forename: Marta Martínez
authors.initials: MM
authors.lastname: Insua
authors.forename: Julia Pérez
authors.initials: JP
authors.lastname: Baz
authors.forename: Martha
authors.initials: M
authors.lastname: Trujillo
authors.forename: Ricard A
authors.initials: RA
authors.lastname: Rodriguez-Mias
authors.forename: Eliandre
authors.initials: E
authors.lastname: Oliveira
authors.forename: Ernest
authors.initials: E
authors.lastname: Giralt
authors.forename: Fernando
authors.initials: F
authors.lastname: Albericio
authors.forename: Librada M
authors.initials: LM
authors.lastname: Cañedo
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D045744:Cell Line, Tumor; D047630:Depsipeptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D003904:Mitosporic Fungi / Q000378:metabolism*; D008968:Molecular Conformation; D021241:Spectrometry, Mass, Electrospray Ionization; D014871:Water Microbiology
chemical_list: D000903:Antibiotics, Antineoplastic; D047630:Depsipeptides; C519452:IB-01212