4uwr

Mono-zinc VIM-26. Leu224 in VIM-26 from Klebsiella pneumoniae has implications for drug binding.

spinqualitylabelsall models 4uwr, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4uwr is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FMT, NA, ZN NonStd Res: OCS Related: 4uwo, 4uwp, 4uws Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed During the last decades antimicrobial resistance has become a global health problem. Metallo-beta-lactamases (MBLs) which are broad-spectrum beta-lactamases that inactivate virtually all beta-lactams including carbapenems, are contributing to this health problem. In this study a novel MBL variant, termed VIM-26, identified in a Klebsiella pneumoniae isolate was studied. VIM-26 belongs to the Verona integron-encoded metallo-beta-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 A, 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. Structural and biochemical characterization of VIM-26 shows that Leu224 has implications for the substrate specificity of VIM metallo-beta-lactamases.,Leiros HK, Edvardsen KS, Bjerga GE, Samuelsen O FEBS J. 2015 Jan 19. doi: 10.1111/febs.13200. PMID:25601024 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-lactamase

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