1f25 | pdb_00001f25
CRYSTAL STRUCTURE OF NO COMPLEX OF THR243ASN MUTANTS OF CYTOCHROME P450NOR
Structural highlights
Function[NOR_FUSOX] Nitric oxide reductase which is involved in a dissimilatory reduction of nitrite. Acts as a nitric oxide reductase. Is able to reduce nitrate and nitrite to a gaseous form of N(2)O when oxygen supply is limited or discontinued. May function as a detoxification mechanism.[1] [2] 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 PubMedThreonine 243 of cytochrome P450nor (fungal nitric oxide reductase) corresponds to the 'conserved' Thr in the long I helix of monooxygenase cytochrome P450s. In P450nor, the replacement of Thr243 with Asn, Ala or Val makes the enzymatic activity dramatically reduce. In order to understand the roles of Thr243 in the reduction reaction of NO by P450nor, the crystal structures of three Thr243 mutants (Thr243-->Asn, Thr243-->Val, Thr243-->Ala) of P450nor were determined at a 1.4-A resolution and at cryogenic temperature. However, the hydrogen-bonding pattern in the heme pocket of these mutants is essentially similar for that of the WT enzyme. This suggests that the determination of the structure of the NADH complex of P450nor is required, in order to evaluate the role of Thr243 in its enzymatic reaction. We attempted to crystallize the NADH complex under several conditions, but have not yet been successful. Mutation effects of a conserved threonine (Thr243) of cytochrome P450nor on its structure and function.,Obayashi E, Shimizu H, Park SY, Shoun H, Shiro Y J Inorg Biochem. 2000 Nov;82(1-4):103-11. PMID:11132616[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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