Binding of D- and L-captopril inhibitors to metallo-β-lactamase studied by polarizable molecular mechanics and quantum mechanics

被引:53
作者
Antony, J
Gresh, N
Olsen, L
Hemmingsen, L
Schofield, CJ
Bauer, R [1 ]
机构
[1] Royal Vet & Agr Univ, Dept Math & Phys, DK-1871 Frederiksberg C, Denmark
[2] UFR Sci Pharmaceut & Biol, Equipe Pharmacochim Mol & Cellulaire, CNRS, UMR 8638, F-75270 Paris 06, France
[3] Univ Oxford, Dyson Perrins Lab, Dept Chem, Oxford OX1 3QY, England
关键词
metallo-beta-lactamase; inhibitor docking; polarizable molecular mechanics; ab initio HF and DFT computations; resistance of bacteria against antibiotics;
D O I
10.1002/jcc.10111
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The bacterial Zn2+ metallo-beta-lactamase from B. fragilis is a zinc-enzyme with two potential metal ion binding sites. It cleaves the lactam ring of antibiotics, thus contributing to the acquired resistance of bacteria against antibiotics, The present study bears on the binuclear form of the enzyme. We compare several possible binding modes of captopril, a mercaptocarboxamide inhibitor of several zinc-metalloenzymes. Two diastereoisomers of captopril were considered, with either a D- or an L-proline residue. We have used the polarizable molecular mechanics procedure SIBFA (Sum of Interactions Between Fragments ab initio computed). Two beta-lactamase models were considered, encompassing 104 and 188 residues, respectively. The energy balances included the inter and intramolecular interaction energies as well as the contribution from solvation computed using a continuum reaction field procedure. The thiolate ion of the inhibitor is binding to both metal ions. expelling the bridging solvent molecule from the uncomplexed enzyme. Different competing binding modes of captopril were considered, either where the inhibitor binds in a monodentate mode to the zinc cations only with its thiolate ion, or in bidentate modes involving additional zinc binding by its carboxylate or ketone carbonyl groups. The additional coordination by the inhibitor's carboxylate or carbonyl group always occurs at the zinc ion, which is bound by a histidine, a cysteine, and an aspartate side chain, For both diastereomers, the energy balances favor monodentate binding of captopril via S-. The preference over bidentate binding is small. The interaction energies were recomputed in model sites restricted to captopril, the Zn2+ cations, and their coordinating end side chains from beta-lactamase (98 atoms). The interaction energies and their ranking among competing arrangements were consistent with those computed by ab initio HF and DFT procedures.
引用
收藏
页码:1281 / 1296
页数:16
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