6ol8

Crystal structure of NDM-12 metallo-beta-lactamase in complex with hydrolyzed ampicillin

spinqualitylabelsall models 6ol8, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ol8 is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: CL, NA, ZN, ZZ7 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A024FRL9_ECOLX Publication Abstract from PubMed Two accessory loop regions that are present in numerous variants of New Delhi metallo-beta-lactamases (NDM) are important for the enzymatic activity. The first one is a flexible loop L3 that is located near the active site and is thought to play an important role in the catalytic process. The second region, Omega loop is located close to a structural element that coordinates two essential zinc ions. Both loops are not involved in any specific interactions with a substrate. Herein, we investigated how the length and hydrophobicity of loop L3 influence the enzymatic activity of NDMs, by analyzing mutants of NDM-1 with various deletions/point mutations within the L3 loop. We also investigated NDM variants with sequence variations/artificial deletions within the Omega loop. For all these variants we determined kinetic parameters for the hydrolysis of ampicillin, imipenem, and a chromogenic cephalosporin (CENTA). None of the mutations in the L3 loop completely abolished the enzymatic activity of NDM-1. Our results suggest that various elements of the loop play different roles in the hydrolysis of different substrates and the flexibility of the loop seems necessary to fulfill the requirements imposed by various substrates. Deletions within the Omega loop usually enhanced the enzymatic activity, particularly for the hydrolysis of ampicillin and imipenem. However, the exact role of the Omega loop in the catalytic reaction remains unclear. In our kinetic tests, the NDM enzymes were inhibited in the beta-lactamase reaction by the CENTA substrate. We also present the X-ray crystal structures of the NDM-1, NDM-9 and NDM-12 proteins. Flexible loops of New Delhi metallo-beta-lactamase modulate its activity towards different substrates.,Raczynska JE, Imiolczyk B, Komorowska M, Sliwiak J, Czyrko-Horczak J, Brzezinski K, Jaskolski M Int J Biol Macromol. 2020 Apr 28;158:104-115. doi:, 10.1016/j.ijbiomac.2020.04.219. PMID:32353499 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-lactamase 3D structures

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