1f26
From Proteopedia
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CRYSTAL STRUCTURE OF NO COMPLEX OF THR243VAL MUTANTS OF CYTOCHROME P450NOR
Overview
Threonine 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.
About this Structure
1F26 is a Single protein structure of sequence from Fusarium oxysporum with HEM, NO and GOL as ligands. Active as Nitric-oxide reductase, with EC number 1.7.99.7 Full crystallographic information is available from OCA.
Reference
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
Page seeded by OCA on Tue Nov 20 14:32:17 2007
