Structural Basis of Metallo-β-Lactamase Inhibition by Captopril Stereoisomers

• Published in: Antimicrobial agents and chemotherapy Vol. 60; no. 1; pp. 142 - 150
• Main Authors: Brem, Jürgen, van Berkel, Sander S, Zollman, David, Lee, Sook Y, Gileadi, Opher, McHugh, Peter J, Walsh, Timothy R, McDonough, Michael A, Schofield, Christopher J
• Format: Journal Article
• Language: English
• Published: United States American Society for Microbiology 01.01.2016
• Subjects: Angiotensin-Converting Enzyme Inhibitors; Angiotensin-Converting Enzyme Inhibitors - chemistry; Angiotensin-Converting Enzyme Inhibitors - pharmacology; Anti-Bacterial Agents - pharmacology; beta-Lactam Resistance - drug effects; beta-Lactam Resistance - genetics; beta-Lactamase Inhibitors; beta-Lactamase Inhibitors - chemistry; beta-Lactamase Inhibitors - pharmacology; beta-Lactamases; beta-Lactamases - chemistry; beta-Lactamases - genetics; beta-Lactamases - metabolism; Captopril; Captopril - chemistry; Captopril - pharmacology; Carbapenems - pharmacology; Cloning, Molecular; Crystallography, X-Ray; Drug Repositioning; Enterobacteriaceae; Enterobacteriaceae - drug effects; Enterobacteriaceae - enzymology; Enterobacteriaceae - genetics; Gene Expression; Hydrolysis; Kinetics; Mechanisms of Resistance; Microbial Sensitivity Tests; Models, Molecular; Recombinant Proteins - chemistry; Recombinant Proteins - genetics; Recombinant Proteins - metabolism; Stereoisomerism; Structure-Activity Relationship
• ISSN: 0066-4804; 1098-6596
• DOI: 10.1128/AAC.01335-15

β-Lactams are the most successful antibacterials, but their effectiveness is threatened by resistance, most importantly by production of serine- and metallo-β-lactamases (MBLs). MBLs are of increasing concern because they catalyze the hydrolysis of almost all β-lactam antibiotics, including recent-generation carbapenems. Clinically useful serine-β-lactamase inhibitors have been developed, but such inhibitors are not available for MBLs. l-Captopril, which is used to treat hypertension via angiotensin-converting enzyme inhibition, has been reported to inhibit MBLs by chelating the active site zinc ions via its thiol(ate). We report systematic studies on B1 MBL inhibition by all four captopril stereoisomers. High-resolution crystal structures of three MBLs (IMP-1, BcII, and VIM-2) in complex with either the l- or d-captopril stereoisomer reveal correlations between the binding mode and inhibition potency. The results will be useful in the design of MBL inhibitors with the breadth of selectivity required for clinical application against carbapenem-resistant Enterobacteriaceae and other organisms causing MBL-mediated resistant infections.