5xao | pdb_00005xao

Crystal structure of Phaeospaeria nodrum fructosyl peptide oxidase mutant Asn56Ala in complexes with sodium and chloride ions

spinqualitylabelsall models 5xao, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5xao is a 2 chain structure with sequence from Parastagonospora nodorum SN15. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: ACY, CL, FAD, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q0UIL6_PHANO Publication Abstract from PubMed Current enzymatic systems for quantifying glycated hemoglobin are based on the FAD-containing enzyme fructosyl peptide oxidase (FPOX). FPOX has substrate specificity for fructosyl-alpha N-valyl-histidine derived from proteolytic digestion of the N-terminus of the HbA1c beta-chain. This study reports the X-ray structures of the wild-type and Asn56Ala (N56A) mutant of Phaeosphaeria nodorum fructosyl peptide oxidase (PnFPOX) to elucidate the residues responsible for the oxidative half-reaction. N56A showed decreased oxidase activity compared to the wild -type, while its dye-mediated dehydrogenase activity was higher than that of wild type. In wild-type PnFPOX, Asn56 forms a hydrogen bond with Lys274, thereby preventing it from forming a salt bridge with Asp54. By contrast, Lys274 of PnFPOX N56A moves toward Asp54, and they approach each other to form a salt bridge at a distance of 2.92-3.35 A. Site-directed mutagenesis studies and protein channel analysis suggest that Asp54 assists in accepting oxygen properly at the position of the bound water molecule in the main oxygen channel. These results reveal that Asn56 in PnFPOX is essential for maintaining an effective oxygen accession path, and support the role of Asp54 as a gate keeper that cooperates with Lys274 to enable oxygen to reach the active site properly. X-ray structures of fructosyl peptide oxidases revealing residues responsible for gating oxygen access in the oxidative half reaction.,Shimasaki T, Yoshida H, Kamitori S, Sode K Sci Rep. 2017 Jun 5;7(1):2790. doi: 10.1038/s41598-017-02657-5. PMID:28584265 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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