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1nr6

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[[Image:1nr6.gif|left|200px]]
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{{STRUCTURE_1nr6| PDB=1nr6 | SCENE= }}
{{STRUCTURE_1nr6| PDB=1nr6 | SCENE= }}
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'''MICROSOMAL CYTOCHROME P450 2C5/3LVDH COMPLEX WITH DICLOFENAC'''
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===MICROSOMAL CYTOCHROME P450 2C5/3LVDH COMPLEX WITH DICLOFENAC===
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==Overview==
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The structure of the anti-inflammatory drug diclofenac bound in the active site of rabbit microsomal cytochrome P450 2C5/3LVdH was determined by X-ray crystallography to 2.1 A resolution. P450 2C5/3LVdH and the related enzyme 2C5dH catalyze the 4'-hydroxylation of diclofenac with apparent K(m) values of 80 and 57 microM and k(cat) values of 13 and 16 min(-1), respectively. Spectrally determined binding constants are similar to the K(m) values. The structure indicates that the pi-electron system of the dichlorophenyl moiety faces the heme Fe with the 3'- and 4'-carbons located 4.4 and 4.7 A, respectively, from the Fe. The carboxyl moiety of the substrate is hydrogen bonded to a cluster of waters that are also hydrogen bonded to the side chains of N204, K241, S289, and D290 as well as the backbone of the protein. The proximity of the diclofenac carboxylate to the side chain of D290 together with an increased binding affinity at lower pH suggests that diclofenac is protonated when bound to the enzyme. The structure exhibits conformational changes indicative of an adaptive fit to the substrate reflecting both the hydration and size of the substrate. These results indicate how structurally diverse substrates are recognized by drug-metabolizing P450 enzymes.
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{{ABSTRACT_PUBMED_12899620}}
==About this Structure==
==About this Structure==
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[[Category: Progesterone 21-hydroxylase]]
[[Category: Progesterone 21-hydroxylase]]
[[Category: Pyrene hydroxylase]]
[[Category: Pyrene hydroxylase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:53:06 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 14:09:50 2008''

Revision as of 11:09, 27 July 2008

Image:1nr6.png

Template:STRUCTURE 1nr6

MICROSOMAL CYTOCHROME P450 2C5/3LVDH COMPLEX WITH DICLOFENAC

Template:ABSTRACT PUBMED 12899620

About this Structure

1NR6 is a Single protein structure of sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA.

Reference

Structure of mammalian cytochrome P450 2C5 complexed with diclofenac at 2.1 A resolution: evidence for an induced fit model of substrate binding., Wester MR, Johnson EF, Marques-Soares C, Dijols S, Dansette PM, Mansuy D, Stout CD, Biochemistry. 2003 Aug 12;42(31):9335-45. PMID:12899620

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