5f1f

Crystal structure of CMY-10 adenylylated by acetyl-AMP

spinqualitylabelsall models 5f1f, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5f1f is a 1 chain structure with sequence from Klebsiella aerogenes. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.548Å Ligands: AMP, CD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function BLC10_KLEAE Class C beta-lactamase which confers resistance to penicillins and cephalosporins (PubMed:15383166). Has benzylpenicillin-, ceftazidime-, nitrocefin- and imipenem-hydrolyzing activity (PubMed:16677302, PubMed:28242658). Publication Abstract from PubMed Objectives: : Investigation into the adenylylation of the nucleophilic serine in AmpC BER and CMY-10 extended-spectrum class C beta-lactamases. Methods: : The formation and the stability of the adenylate adduct were examined by X-ray crystallography and MS. Inhibition assays for kinetic parameters were performed by monitoring the hydrolytic activity of AmpC BER and CMY-10 using nitrocefin as a reporter substrate. The effect of adenosine 5'-(P-acetyl)monophosphate (acAMP) on the MIC of ceftazidime was tested with four Gram-negative clinical isolates. Results: : The crystal structures and MS analyses confirmed the acAMP-mediated adenylylation of the nucleophilic serine in AmpC BER and CMY-10. acAMP inhibited AmpC BER and CMY-10 through the adenylylation of the nucleophilic serine, which could be modelled as a two-step mechanism. The initial non-covalent binding of acAMP to the active site is followed by the covalent attachment of its AMP moiety to the nucleophilic serine. The inhibition efficiencies ( k inact / K I ) of acAMP against AmpC BER and CMY-10 were determined to be 320 and 140 M -1 s -1 , respectively. The combination of ceftazidime and acAMP reduced the MIC of ceftazidime against the tested bacteria. Conclusions: : Our structural and kinetic studies revealed the detailed mechanism of adenylylation of the nucleophilic serine and may serve as a starting point for the design of novel class C beta-lactamase inhibitors on the basis of the nucleotide scaffold. Structural and mechanistic insights into the inhibition of class C beta-lactamases through the adenylylation of the nucleophilic serine.,Kim MK, An YJ, Na JH, Seol JH, Ryu JY, Lee JW, Kang LW, Chung KM, Lee JH, Moon JH, Lee JS, Cha SS J Antimicrob Chemother. 2017 Mar 1;72(3):735-743. doi: 10.1093/jac/dkw491. PMID:27999057 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-lactamase 3D structures

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