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1ek1

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{{STRUCTURE_1ek1| PDB=1ek1 | SCENE= }}
{{STRUCTURE_1ek1| PDB=1ek1 | SCENE= }}
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'''CRYSTAL STRUCTURE OF MURINE SOLUBLE EPOXIDE HYDROLASE COMPLEXED WITH CIU INHIBITOR'''
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===CRYSTAL STRUCTURE OF MURINE SOLUBLE EPOXIDE HYDROLASE COMPLEXED WITH CIU INHIBITOR===
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==Overview==
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The structures of two alkylurea inhibitors complexed with murine soluble epoxide hydrolase have been determined by x-ray crystallographic methods. The alkyl substituents of each inhibitor make extensive hydrophobic contacts in the soluble epoxide hydrolase active site, and each urea carbonyl oxygen accepts hydrogen bonds from the phenolic hydroxyl groups of Tyr(381) and Tyr(465). These hydrogen bond interactions suggest that Tyr(381) and/or Tyr(465) are general acid catalysts that facilitate epoxide ring opening in the first step of the hydrolysis reaction; Tyr(465) is highly conserved among all epoxide hydrolases, and Tyr(381) is conserved among the soluble epoxide hydrolases. In one enzyme-inhibitor complex, the urea carbonyl oxygen additionally interacts with Gln(382). If a comparable interaction occurs in catalysis, then Gln(382) may provide electrostatic stabilization of partial negative charge on the epoxide oxygen. The carboxylate side chain of Asp(333) accepts a hydrogen bond from one of the urea NH groups in each enzyme-inhibitor complex. Because Asp(333) is the catalytic nucleophile, its interaction with the partial positive charge on the urea NH group mimics its approach toward the partial positive charge on the electrophilic carbon of an epoxide substrate. Accordingly, alkylurea inhibitors mimic features encountered in the reaction coordinate of epoxide ring opening, and a structure-based mechanism is proposed for leukotoxin epoxide hydrolysis.
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(as it appears on PubMed at http://www.pubmed.gov), where 10747889 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10747889}}
==About this Structure==
==About this Structure==
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[[Category: Disubstituted urea inhibitor]]
[[Category: Disubstituted urea inhibitor]]
[[Category: Homodimer]]
[[Category: Homodimer]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:11:50 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 00:52:18 2008''

Revision as of 21:52, 30 June 2008

Image:1ek1.png

Template:STRUCTURE 1ek1

CRYSTAL STRUCTURE OF MURINE SOLUBLE EPOXIDE HYDROLASE COMPLEXED WITH CIU INHIBITOR

Template:ABSTRACT PUBMED 10747889

About this Structure

1EK1 is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.

Reference

Binding of alkylurea inhibitors to epoxide hydrolase implicates active site tyrosines in substrate activation., Argiriadi MA, Morisseau C, Goodrow MH, Dowdy DL, Hammock BD, Christianson DW, J Biol Chem. 2000 May 19;275(20):15265-70. PMID:10747889

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