1EHY

X-ray structure of the epoxide hydrolase from agrobacterium radiobacter ad1

1EHY の概要

• エントリーDOI: 10.2210/pdb1ehy/pdb
• 分子名称: PROTEIN (SOLUBLE EPOXIDE HYDROLASE), POTASSIUM ION (3 entities in total)
• 機能のキーワード: hydrolase, alpha/beta hydrolase fold, epoxide degradation, epichlorohydrin
• 由来する生物種: Agrobacterium tumefaciens
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 136455.02

構造登録者

Nardini, M.,Ridder, I.S.,Rozeboom, H.J.,Kalk, K.H.,Rink, R.,Janssen, D.B.,Dijkstra, B.W. (登録日: 1998-10-17, 公開日: 1999-10-16, 最終更新日: 2024-10-30)

主引用文献

Nardini, M.,Ridder, I.S.,Rozeboom, H.J.,Kalk, K.H.,Rink, R.,Janssen, D.B.,Dijkstra, B.W.
The x-ray structure of epoxide hydrolase from Agrobacterium radiobacter AD1. An enzyme to detoxify harmful epoxides.
J.Biol.Chem., 274:14579-14586, 1999

PubMed Abstract: Epoxide hydrolases catalyze the cofactor-independent hydrolysis of reactive and toxic epoxides. They play an essential role in the detoxification of various xenobiotics in higher organisms and in the bacterial degradation of several environmental pollutants. The first x-ray structure of one of these, from Agrobacterium radiobacter AD1, has been determined by isomorphous replacement at 2.1-A resolution. The enzyme shows a two-domain structure with the core having the alpha/beta hydrolase-fold topology. The catalytic residues, Asp107 and His275, are located in a predominantly hydrophobic environment between the two domains. A tunnel connects the back of the active-site cavity with the surface of the enzyme and provides access to the active site for the catalytic water molecule, which in the crystal structure, has been found at hydrogen bond distance to His275. Because of a crystallographic contact, the active site has become accessible for the Gln134 side chain, which occupies a position mimicking a bound substrate. The structure suggests Tyr152/Tyr215 as the residues involved in substrate binding, stabilization of the transition state, and possibly protonation of the epoxide oxygen.

PubMed: 10329649
DOI: 10.1074/jbc.274.21.14579

実験手法

X-RAY DIFFRACTION (2.1 Å)