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2cl5

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{{STRUCTURE_2cl5| PDB=2cl5 | SCENE= }}
{{STRUCTURE_2cl5| PDB=2cl5 | SCENE= }}
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'''CATECHOL-O-METHYLTRANSFERASE IN COMPLEX WITH AN INHIBITOR'''
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===CATECHOL-O-METHYLTRANSFERASE IN COMPLEX WITH AN INHIBITOR===
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==Overview==
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In this work, we present a comparative case study of "ortho-" and "meta-nitrated" catecholic inhibitors of catechol-O-methyltransferase (COMT), with regard to their interaction with the catalytic site of the enzyme and the in vitro regioselective formation of their mono-O-methyl ether metabolites. In particular, the effects of altering the attachment position of the inhibitors' side-chain substituent, within the classic nitrocatechol pharmacophore, were investigated. For this purpose, we compared two simple regioisomeric nitrocatechol-type inhibitors of COMT, BIA 3-228 and BIA 8-176, which contain the benzoyl substituent attached at the meta and ortho positions, respectively, relative to the nitro group. The two compounds were slowly O-methylated by COMT in vitro, but the particular substitution pattern of each compound was shown to have a profound impact on the regioselectivity of their O-methylation. To provide a plausible interpretation of these results, a comprehensive analysis of the protein-inhibitor interactions and of the relative chemical susceptibility to O-methylation of the catechol hydroxyl groups was performed by means of docking simulations and ab initio molecular orbital calculations. The major structural and chemical factors that determine the enzyme regioselectivity of O-methylation were identified, and the X-ray structure of the complex of COMT with S-adenosyl-l-methionine and BIA 8-176 is herein disclosed. This is the first reported structure of the soluble form of COMT complexed with a nitrocatecholic inhibitor having a bulky substituent group in adjacent position (ortho) to the nitro group. Structural and dynamic aspects of this complex are analyzed and discussed, in the context of the present study.
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{{ABSTRACT_PUBMED_16618795}}
==About this Structure==
==About this Structure==
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[[Category: Transferase]]
[[Category: Transferase]]
[[Category: Transmembrane]]
[[Category: Transmembrane]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 20:27:34 2008''

Revision as of 17:27, 27 July 2008

Image:2cl5.png

Template:STRUCTURE 2cl5

CATECHOL-O-METHYLTRANSFERASE IN COMPLEX WITH AN INHIBITOR

Template:ABSTRACT PUBMED 16618795

About this Structure

2CL5 is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Comparative study of ortho- and meta-nitrated inhibitors of catechol-O-methyltransferase: interactions with the active site and regioselectivity of O-methylation., Palma PN, Rodrigues ML, Archer M, Bonifacio MJ, Loureiro AI, Learmonth DA, Carrondo MA, Soares-da-Silva P, Mol Pharmacol. 2006 Jul;70(1):143-53. Epub 2006 Apr 17. PMID:16618795

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