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7cpp

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{{STRUCTURE_7cpp| PDB=7cpp | SCENE= }}
{{STRUCTURE_7cpp| PDB=7cpp | SCENE= }}
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'''THE STRUCTURAL BASIS FOR SUBSTRATE-INDUCED CHANGES IN REDOX POTENTIAL AND SPIN EQUILIBRIUM IN CYTOCHROME P450(CAM)'''
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===THE STRUCTURAL BASIS FOR SUBSTRATE-INDUCED CHANGES IN REDOX POTENTIAL AND SPIN EQUILIBRIUM IN CYTOCHROME P450(CAM)===
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==Overview==
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The crystal structures of cytochrome P-450CAM complexed with the alternative substrates norcamphor and adamantanone have been refined at 2.0-A resolution and compared with the native, camphor-bound form of the enzyme. Norcamphor lacks the 8-, 9-, and 10-methyl groups of camphor. Thus, specific interactions between these groups and phenylalanine 87 and valines 247 and 295 are missing in the norcamphor complex. As a result, norcamphor binds about 0.9 A further from the oxygen-binding site than does camphor, which allows sufficient room for a water molecule or hydroxide ion to remain coordinated with the heme iron atom. The larger adamantanone occupies a position closer to that of camphor and, as in the camphor-bound enzyme, the heme iron remains pentacoordinate with no solvent molecule coordinated as a sixth ligand. A comparison of crystallographic temperature factors indicates that norcamphor is more "loosely" bound than are either camphor or adamantanone, as might be expected from the relative sizes of the different substrates. The looser fit of norcamphor in the active-site pocket results in a less specific pattern of hydroxylation. The presence of an aqua ligand is the likely structural basis for the norcamphor-P-450CAM complex having both a lower redox potential and higher percentage of low-spin heme than do either the camphor-P-450CAM or adamantanone-P-450CAM complexes.
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(as it appears on PubMed at http://www.pubmed.gov), where 2713354 is the PubMed ID number.
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{{ABSTRACT_PUBMED_2713354}}
==About this Structure==
==About this Structure==
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[[Category: Poulos, T L.]]
[[Category: Poulos, T L.]]
[[Category: Raag, R.]]
[[Category: Raag, R.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 14:31:54 2008''

Revision as of 11:31, 3 July 2008

Image:7cpp.png

Template:STRUCTURE 7cpp

THE STRUCTURAL BASIS FOR SUBSTRATE-INDUCED CHANGES IN REDOX POTENTIAL AND SPIN EQUILIBRIUM IN CYTOCHROME P450(CAM)

Template:ABSTRACT PUBMED 2713354

About this Structure

7CPP is a Single protein structure of sequence from Pseudomonas putida. Full crystallographic information is available from OCA.

Reference

The structural basis for substrate-induced changes in redox potential and spin equilibrium in cytochrome P-450CAM., Raag R, Poulos TL, Biochemistry. 1989 Jan 24;28(2):917-22. PMID:2713354

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