1xqd | pdb_00001xqd

Crystal structure of P450NOR complexed with 3-pyridinealdehyde adenine dinucleotide

spinqualitylabelsall models 1xqd, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xqd is a 1 chain structure with sequence from Fusarium oxysporum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DND, HEM Related: 1ulw Activity: Nitric-oxide reductase, with EC number 1.7.99.7 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Nitric oxide reductase cytochrome P450nor catalyzes an unusual reaction, direct electron transfer from NAD(P)H to bound heme. Here, we succeeded in determining the crystal structure of P450nor in a complex with an NADH analogue, nicotinic acid adenine dinucleotide, which provides conclusive evidence for the mechanism of the unprecedented electron transfer. Comparison of the structure with those of dinucleotide-free forms revealed a global conformational change accompanied by intriguing local movements caused by the binding of the pyridine nucleotide. Arg64 and Arg174 fix the pyrophosphate moiety upon the dinucleotide binding. Stereo-selective hydride transfer from NADH to NO-bound heme was suggested from the structure, the nicotinic acid ring being fixed near the heme by the conserved Thr residue in the I-helix and the upward-shifted propionate side-chain of the heme. A proton channel near the NADH channel is formed upon the dinucleotide binding, which should direct continuous transfer of the hydride and proton. A salt-bridge network (Glu71-Arg64-Asp88) was shown to be crucial for a high catalytic turnover. Structural evidence for direct hydride transfer from NADH to cytochrome P450nor.,Oshima R, Fushinobu S, Su F, Zhang L, Takaya N, Shoun H J Mol Biol. 2004 Sep 3;342(1):207-17. PMID:15313618 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome P450

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