Affiliation:
1. Banyu Tsukuba Research Institute, 3 Okubo, Tsukuba 300-2611, Japan
Abstract
ABSTRACT
A variety of 1β-methylcarbapenem derivatives were screened to identify inhibitors of IMP-1 metallo-β-lactamase, a class B β-lactamase, in an automated microassay system using nitrocefin as a substrate. The structure–inhibitory-activity relationship study revealed that three types of 1β-methylcarbapenems having benzothienylthio, dithiocarbamate, or pyrrolidinylthio moieties at the C-2 position showed good inhibitory activity. Among the compounds screened, J-110,441, having a benzothienylthio moiety at the C-2 position of 1β-methylcarbapenem, was the most potent inhibitor of class B metallo-β-lactamases with
K
i
values of 0.0037, 0.23, 1.00, and 0.83 μM for IMP-1 encoded by the
bla
IMP
gene, CcrA from
Bacteroides fragilis
, L1 from
Stenotrophomonas maltophilia
, and type II from
Bacillus cereus
, respectively. In a further characterization study, J-110,441 also showed inhibitory activity against TEM-type class A serine β-lactamase and chromosomal class C serine β-lactamase from
Enterobacter cloacae
with
K
i
values of 2.54 and 0.037 μM, respectively. Combining imipenem or ceftazidime with J-110,441 had a synergistic effect on the antimicrobial activity against β-lactamase-producing bacteria. Against the isolates of IMP-1-producing
Serratia marcescens
, the MICs of imipenem decreased to levels ranging from 1/64 to 1/4 in the presence of one-fourth of the MIC of J-110,441. Against
E. cloacae
producing high levels of class C β-lactamase, the MIC of ceftazidime decreased from 64 to 4 μg/ml in the presence of 4 μg of J-110,441 per ml. This is the first report to describe a new class of inhibitor of class B and class C β-lactamases including transferable IMP-1 metallo-β-lactamases.
Publisher
American Society for Microbiology
Subject
Infectious Diseases,Pharmacology (medical),Pharmacology
Cited by
66 articles.
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