5g5u

Crystal structure of NagZ H174A mutant from Pseudomonas aeruginosa

spinqualitylabelsall models 5g5u, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5g5u is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Activity: Beta-N-acetylhexosaminidase, with EC number 3.2.1.52 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [NAGZ_PSEAE] Plays a role in peptidoglycan recycling by cleaving the terminal beta-1,4-linked N-acetylglucosamine (GlcNAc) from peptide-linked peptidoglycan fragments, giving rise to free GlcNAc, anhydro-N-acetylmuramic acid and anhydro-N-acetylmuramic acid-linked peptides.[HAMAP-Rule:MF_00364] Publication Abstract from PubMed The N-acetylglucosaminidase NagZ of Pseudomonas aeruginosa catalyzes the first cytoplasmic step in recycling of muropeptides, cell-wall-derived natural products. This reaction regulates gene expression for the beta-lactam resistance enzyme, beta-lactamase. The enzyme catalyzes hydrolysis of N-acetyl-beta-d-glucosamine-(1-->4)-1,6-anhydro-N-acetyl-beta-d-muramyl-peptide (1) to N-acetyl-beta-d-glucosamine (2) and 1,6-anhydro-N-acetyl-beta-d-muramyl-peptide (3). The structural and functional aspects of catalysis by NagZ were investigated by a total of seven X-ray structures, three computational models based on the X-ray structures, molecular-dynamics simulations and mutagenesis. The structural insights came from the unbound state and complexes of NagZ with the substrate, products and a mimetic of the transient oxocarbenium species, which were prepared by synthesis. The mechanism involves a histidine as acid/base catalyst, which is unique for glycosidases. The turnover process utilizes covalent modification of D244, requiring two transition-state species and is regulated by coordination with a zinc ion. The analysis provides a seamless continuum for the catalytic cycle, incorporating large motions by four loops that surround the active site. Catalytic Cycle of the N-Acetylglucosaminidase NagZ from Pseudomonas aeruginosa.,Acebron I, Mahasenan KV, De Benedetti S, Lee M, Artola-Recolons C, Hesek D, Wang H, Hermoso JA, Mobashery S J Am Chem Soc. 2017 May 10. doi: 10.1021/jacs.7b01626. PMID:28482153 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-Hexosaminidase Beta-Hexosaminidase 3D structures

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