title: Inactivation of beta-lactamase from Shigella flexneri UCSF-129 by BRL 42715, a potent inhibitor.
abstract: The effect of a powerful inhibitor, BRL 42715, on beta-lactamase from Shigella flexneri UCSF-129, to overcome the problem of shigellosis and its resistance to ampicillin, was studied. The I50 was determined for BRL 42715 [C6-(N1-methyl-1,2,3 triazolylmethylene)penem] as 0.0049 microgram/ml being 20-fold lower than the best inhibitor, 6-beta-iodopenicillanic acid, previously reported. The MIC fell from 2,048 to 2 micrograms/ml in the presence of 1 microgram/ml of BRL 42715. The synergism of the ampicillin plus this inhibitor lasted for 9 h. BRL 42715 is an irreversible inhibitor, according to the dialysis results, and a substrate analogue.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Concepción, Chile.
authors.forename: M
authors.initials: M
authors.lastname: Campos
authors.forename: G
authors.initials: G
authors.lastname: Bocaz
authors.forename: O
authors.initials: O
authors.lastname: Vasquez
authors.forename: H
authors.initials: H
authors.lastname: Gonzalez
authors.forename: J
authors.initials: J
authors.lastname: Caceres
authors.forename: C
authors.initials: C
authors.lastname: Yañez
mesh_terms: D000668:Ampicillin Resistance; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D007769:Lactams; D008826:Microbial Sensitivity Tests; D012763:Shigella flexneri / Q000201:enzymology*; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000378:metabolism; D047090:beta-Lactams
chemical_list: D000900:Anti-Bacterial Agents; D007769:Lactams; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams; C061593:C6-(N1-methyl-1,2,3-trazolylmethylene)penem; D001618:beta-Lactamases