期刊
FEBS JOURNAL
卷 282, 期 6, 页码 1031-1042出版社
WILEY
DOI: 10.1111/febs.13200
关键词
antibiotic resistance; drug binding site; Klebsiellapneumoniae; metallo--lactamase; minimum inhibitory concentrations
资金
- Norwegian Structural Biology Centre (NorStruct)
- Research Council of Norway (FRIMEDBIO) [213808]
- Tromso Research Foundation
During the last decades antimicrobial resistance has become a global health problem. Metallo--lactamases (MBLs) which are broad-spectrum -lactamases that inactivate virtually all -lactams including carbapenems, are contributing to this health problem. In this study a novel MBL variant, termed VIM-26, identified in a Klebsiellapneumoniae isolate was studied. VIM-26 belongs to the Verona integron-encoded metallo--lactamase (VIM) family of MBLs and is a His224Leu variant of the well-characterized VIM-1 variant. In this study, we report the kinetic parameters, minimum inhibitory concentrations and crystal structures of a recombinant VIM-26 protein, and compare them to previously published data on VIM-1, VIM-2 and VIM-7. The kinetic parameters and minimum inhibitory concentration determinations show that VIM-26, like VIM-7, has higher penicillinase activity but lower cephalosporinase activity than VIM-1 and VIM-2. The four determined VIM-26 crystal structures revealed mono- and di-zinc forms, where the Zn1 ion has distorted tetrahedral coordination geometry with an additional water molecule (W2) at a distance of 2.6-3.7 angstrom, which could be important during catalysis. The R2 drug binding site in VIM-26 is more open compared to VIM-2 and VIM-7 and neutrally charged due to Leu224 and Ser228. Thus, the VIM-26 drug binding properties are different from the VIM-2 (Tyr224/Arg228) and VIM-7 (His224/Arg228) structures, indicating a role of these residues in the substrate specificity.
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