4wm9 | pdb_00004wm9

Acinetobacter baumanii OXA-24 complex with Avibactam

spinqualitylabelsall models 4wm9, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4wm9 is a 1 chain structure with sequence from Acinetobacter baumannii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CO2, EDO, NXL, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8RLA6_ACIBA Publication Abstract from PubMed The Class D (or OXA-type) beta-lactamases have expanded to be the most diverse group of serine beta-lactamases with a highly heterogeneous beta-lactam hydrolysis profile and are typically resistant to marketed beta-lactamase inhibitors. Class D enzymes are increasingly found in multi-drug resistant (MDR) Acinetobacter baumannii, Pseudomonas aeruginosa, and various species of the Enterobacteriaceae and are posing a serious threat to the clinical utility of beta-lactams including the carbapenems, which are typically reserved as the drugs of last resort. Avibactam, a novel non-beta-lactam beta-lactamase inhibitor, not only inhibits all class A and class C beta-lactamases, but also has the promise of inhibition of certain OXA enzymes, thus extending the antibacterial activity of the beta-lactam used in combination to the organisms that produce these enzymes. X-ray structures of OXA-24 and OXA-48 in complex with avibactam revealed the binding mode of this inhibitor in this diverse class of enzymes and provide a rationale for selective inhibition of OXA-48 members. Additionally, various subunits of the OXA-48 structure in the asymmetric unit provide snapshots of different states of the inhibited enzyme. Overall, these data provide the first structural evidence of the exceptionally slow reversibility observed with avibactam in class D beta-lactamases. Mechanisms for acylation and deacylation of avibactam by class D enzymes are proposed, and the likely extent of inhibition of class D beta-lactamases by avibactam is discussed. Molecular basis of selective inhibition and slow reversibility of avibactam against Class D carbapenemases: a structure-guided study of OXA-24 and OXA-48.,Lahiri SD, Mangani S, Jahic H, Benvenuti M, Durand-Reville TF, De Luca F, Ehmann DE, Rossolini GM, Alm RA, Docquier JD ACS Chem Biol. 2014 Nov 19. PMID:25406838 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-lactamase 3D structures

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