title: Penicillin-binding protein 5 as an inhibitory target of cefozopran in Enterococcus faecalis.
abstract: The concentration of cefozopran which inhibits binding of [14C]benzylpenicillin to penicillin-binding protein (PBP) 5 of Enterococcus faecalis TN2OO5 by 50% was 11 mg/L, and its MIC was 12.5 mg/L. Ceftazidime and cefmenoxime, which were inactive at 100 mg/L, showed no affinity for PBP 5 at this concentration. Ampicillin, benzylpenicillin and imipenem showed higher affinity for PBPs 3/4 and PBP 5 than cefozopran, and their MICs were lower than that of cefozopran. No correlation between MICs of the test compounds and the affinity for PBP 1, 2 or 6 was found. These results suggest that cefozopran exhibits antimicrobial activity against E. faecalis TN2OO5 by binding to PBP 5.
authors.affiliation: Takeda Chemical Industries Ltd, Osaka 532, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Tsuchimori
authors.forename: K
authors.initials: K
authors.lastname: Okonogi
mesh_terms: D000900:Anti-Bacterial Agents / Q000378:metabolism / Q000494:pharmacology; D001426:Bacterial Proteins; D002352:Carrier Proteins / Q000378:metabolism*; D002509:Cephaloridine / Q000378:metabolism / Q000494:pharmacology; D002511:Cephalosporins / Q000378:metabolism* / Q000494:pharmacology*; D013293:Enterococcus faecalis / Q000187:drug effects* / Q000378:metabolism*; D006602:Hexosyltransferases; D008826:Microbial Sensitivity Tests; D002267:Muramoylpentapeptide Carboxypeptidase / Q000378:metabolism*; D046915:Penicillin-Binding Proteins; D010458:Peptidyl Transferases; D011485:Protein Binding; D000097586:Cefozopran
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D002352:Carrier Proteins; D002509:Cephaloridine; D002511:Cephalosporins; D006602:Hexosyltransferases; D002267:Muramoylpentapeptide Carboxypeptidase; D046915:Penicillin-Binding Proteins; D010458:Peptidyl Transferases; D000097586:Cefozopran