title: Role of permeability in the activities of beta-lactams against gram-negative bacteria which produce a group 3 beta-lactamase.
abstract: The production of a group 3 beta-lactamase permitted Escherichia coli to raise the MICs of ceftazidime, cefpirome, and meropenem greatly but those of imipenem and piperacillin only slightly. The ratios of maximum rate of hydrolysis to K(m) of ceftazidime, cefpirome, and piperacillin were lower than those of meropenem and imipenem for the group 3 beta-lactamase. The permeability coefficients for piperacillin and meropenem were higher than those for ceftazidime and cefpirome. Imipenem had the highest permeability coefficient.
authors.affiliation: Research Laboratories, Toyama Chemical Co., Ltd., Shimookui, Toyama 930-8508, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Matsumura
authors.forename: S
authors.initials: S
authors.lastname: Minami
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: S
authors.initials: S
authors.lastname: Iyobe
authors.forename: S
authors.initials: S
authors.lastname: Mitsuhashi
mesh_terms: D000900:Anti-Bacterial Agents / Q000493:pharmacokinetics* / Q000494:pharmacology*; D002463:Cell Membrane Permeability; D016971:Citrobacter freundii / Q000187:drug effects / Q000201:enzymology / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology / Q000235:genetics / Q000378:metabolism; D006090:Gram-Negative Bacteria / Q000187:drug effects* / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D007700:Kinetics; D007711:Klebsiella pneumoniae / Q000187:drug effects / Q000201:enzymology / Q000235:genetics / Q000378:metabolism; D008826:Microbial Sensitivity Tests; D010957:Plasmids / Q000235:genetics; D001618:beta-Lactamases / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D047090:beta-Lactams
chemical_list: D000900:Anti-Bacterial Agents; D047090:beta-Lactams; D001618:beta-Lactamases