title: 19-epi-okadaic acid, a novel protein phosphatase inhibitor with enhanced selectivity.
abstract: A new protein phosphatase inhibitor, 19-epi-okadaic acid, was isolated from the marine dinoflagellate Prorocentrum belizeanum. Its structure and conformation in solution has been determined, and important differences were found when compared with the lead compound okadaic acid. The new metabolite showed nanomolar activities, and its selectivity for PP2A versus PP1 surpasses that shown by okadaic acid 10-fold, making it one of the most selective inhibitors of this class.
authors.affiliation: Instituto Universitario de Bio-OrgAnica Antonio GonzAlez, Universidad de La Laguna, Astrofísico Francisco SAnchez 2, 38206 La Laguna, Tenerife, Spain.
authors.forename: Patricia G
authors.initials: PG
authors.lastname: Cruz
authors.forename: Antonio Hernández
authors.initials: AH
authors.lastname: Daranas
authors.forename: José J
authors.initials: JJ
authors.lastname: Fernández
authors.forename: Manuel
authors.initials: M
authors.lastname: Norte
mesh_terms: D000818:Animals; D018360:Crystallography, X-Ray; D004141:Dinoflagellida / Q000737:chemistry*; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D019319:Okadaic Acid / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D010749:Phosphoprotein Phosphatases / Q000037:antagonists & inhibitors*
chemical_list: C522300:19-epi-okadaic acid; D004791:Enzyme Inhibitors; D019319:Okadaic Acid; D010749:Phosphoprotein Phosphatases