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1iwi
From Proteopedia
| 1iwi, resolution 2.00Å () | |||||
|---|---|---|---|---|---|
| Ligands: | , | ||||
| Activity: | Camphor 5-monooxygenase, with EC number 1.14.15.1 | ||||
| Domains: | CypX | ||||
| Related: | 1iwj, 1iwk | ||||
| |||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB, TOPSAN | ||||
| Coordinates: | save as pdb, mmCIF, xml | ||||
Putidaredoxin-Binding Stablilizes an Active Conformer of Cytochrome P450cam in its Reduced State; Crystal Structure of Cytochrome P450cam
Ferrous-carbon monoxide bound form of cytochrome P450cam (CO-P450cam) has two infrared (IR) CO stretching bands at 1940 and 1932 cm(-1). The former band is dominant (>95% in area) for CO-P450cam free of putidaredoxin (Pdx), while the latter band is dominant (>95% in area) in the complex of CO-P450cam with reduced Pdx. The binding of Pdx to CO-P450cam thus evokes a conformational change in the heme active site. To study the mechanism involved in the conformational change, surface amino acid residues Arg79, Arg109, and Arg112 in P450cam were replaced with Lys, Gln, and Met. IR spectroscopic and kinetic analyses of the mutants revealed that an enzyme that has a larger 1932 cm(-1) band area upon Pdx-binding has a larger catalytic activity. Examination of the crystal structures of R109K and R112K suggested that the interaction between the guanidium group of Arg112 and Pdx is important for the conformational change. The mutations did not change a coupling ratio between the hydroxylation product and oxygen consumed. We interpret these findings to mean that the interaction of P450cam with Pdx through Arg112 enhances electron donation from the proximal ligand (Cys357) to the O-O bond of iron-bound O(2) and, possibly, promotes electron transfer from reduced Pdx to oxyP450cam, thereby facilitating the O-O bond splitting.
Infrared spectroscopic and mutational studies on putidaredoxin-induced conformational changes in ferrous CO-P450cam., Nagano S, Shimada H, Tarumi A, Hishiki T, Kimata-Ariga Y, Egawa T, Suematsu M, Park SY, Adachi S, Shiro Y, Ishimura Y, Biochemistry. 2003 Dec 16;42(49):14507-14. PMID:14661963
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
1IWI is a 1 chain structure of sequence from Pseudomonas putida. Full crystallographic information is available from OCA.
Reference
Infrared spectroscopic and mutational studies on putidaredoxin-induced conformational changes in ferrous CO-P450cam., Nagano S, Shimada H, Tarumi A, Hishiki T, Kimata-Ariga Y, Egawa T, Suematsu M, Park SY, Adachi S, Shiro Y, Ishimura Y, Biochemistry. 2003 Dec 16;42(49):14507-14. PMID:14661963
Page seeded by OCA on Sun Nov 16 11:41:38 2008
Categories: Camphor 5-monooxygenase | Pseudomonas putida | Adachi, S. | Egawa, T. | Hishiki, T. | Ishimura, Y. | Kimata-Ariga, Y. | Nagano, S. | Park, S Y. | RSGI, RIKEN Structural Genomics/Proteomics Initiative. | Shimada, H. | Shiro, Y. | Tarumi, A. | Crystal structure | Cytochrome p450cam | Putidaredoxin binding site | Riken structural genomics/proteomics initiative | Rsgi | Structural genomic
