Structure of Human Epoxide Hydrolase Reveals Mechanistic Inferences on Bifunctional Catalysis in Epoxide and Phosphate Ester Hydrolysis

German A. Gomez, Christophe Morisseau, Bruce D. Hammock, David W. Christianson

Research output: Contribution to journalArticle

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Abstract

The X-ray crystal structure of human soluble epoxide hydrolase (sEH) has been determined at 2.6 Å resolution, revealing a domain-swapped quaternary structure identical to that observed for the murine enzyme [Argiriadi, M. A., Morisseau, C., Hammock, B. D., and Christianson, D. W. (1999) Proc. Natl. Acad. Sci. U.S.A. 96, 10637-10642]. As with the murine enzyme, the epoxide hydrolytic mechanism of the human enzyme proceeds through an alkyl-enzyme intermediate with Asp-333 in the C-terminal domain. The structure of the human sEH complex with N-cyclohexyl-N′-(iodophenyl)urea (CIU) has been determined at 2.35 Å resolution. Tyr-381 and Tyr-465 donate hydrogen bonds to the alkylurea carbonyl group of CIU, consistent with the proposed roles of these residues as proton donors in the first step of catalysis. The N-terminal domain of mammalian sEH contains a 15 Å deep cleft, but its biological function is unclear. Recent experiments demonstrate that the N-terminal domain of human sEH catalyzes the metal-dependent hydrolysis of phosphate esters [Cronin, A., Mowbray, S., Dürk, H., Homburg, S., Fleming, I., Fisslthaler, B., Oesch, F., and Arand, M. (2003) Proc. Natl. Acad. Sci. U.S.A. 100, 1552-1557; Newman, J. W., Morisseau, C., Harris, T. R., and Hammock, B. D. (2003) Proc. Natl. Acad. Sci. U.S.A. 100, 1558-1563]. The binding of Mg2+-HPO4 2- to the N-terminal domain of human sEH in its CIU complex reveals structural features relevant to those of the enzyme-substrate complex in the phosphatase reaction.

Original languageEnglish (US)
Pages (from-to)4716-4723
Number of pages8
JournalBiochemistry
Volume43
Issue number16
DOIs
StatePublished - Apr 27 2004

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Epoxide Hydrolases
Epoxy Compounds
Catalysis
Hydrolysis
Esters
Phosphates
Enzymes
Phosphoric Monoester Hydrolases
Urea
Protons
Hydrogen
Hydrogen bonds
Crystal structure
Metals
X-Rays
X rays
Substrates
Experiments

ASJC Scopus subject areas

  • Biochemistry

Cite this

Structure of Human Epoxide Hydrolase Reveals Mechanistic Inferences on Bifunctional Catalysis in Epoxide and Phosphate Ester Hydrolysis. / Gomez, German A.; Morisseau, Christophe; Hammock, Bruce D.; Christianson, David W.

In: Biochemistry, Vol. 43, No. 16, 27.04.2004, p. 4716-4723.

Research output: Contribution to journalArticle

Gomez, German A. ; Morisseau, Christophe ; Hammock, Bruce D. ; Christianson, David W. / Structure of Human Epoxide Hydrolase Reveals Mechanistic Inferences on Bifunctional Catalysis in Epoxide and Phosphate Ester Hydrolysis. In: Biochemistry. 2004 ; Vol. 43, No. 16. pp. 4716-4723.
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abstract = "The X-ray crystal structure of human soluble epoxide hydrolase (sEH) has been determined at 2.6 {\AA} resolution, revealing a domain-swapped quaternary structure identical to that observed for the murine enzyme [Argiriadi, M. A., Morisseau, C., Hammock, B. D., and Christianson, D. W. (1999) Proc. Natl. Acad. Sci. U.S.A. 96, 10637-10642]. As with the murine enzyme, the epoxide hydrolytic mechanism of the human enzyme proceeds through an alkyl-enzyme intermediate with Asp-333 in the C-terminal domain. The structure of the human sEH complex with N-cyclohexyl-N′-(iodophenyl)urea (CIU) has been determined at 2.35 {\AA} resolution. Tyr-381 and Tyr-465 donate hydrogen bonds to the alkylurea carbonyl group of CIU, consistent with the proposed roles of these residues as proton donors in the first step of catalysis. The N-terminal domain of mammalian sEH contains a 15 {\AA} deep cleft, but its biological function is unclear. Recent experiments demonstrate that the N-terminal domain of human sEH catalyzes the metal-dependent hydrolysis of phosphate esters [Cronin, A., Mowbray, S., D{\"u}rk, H., Homburg, S., Fleming, I., Fisslthaler, B., Oesch, F., and Arand, M. (2003) Proc. Natl. Acad. Sci. U.S.A. 100, 1552-1557; Newman, J. W., Morisseau, C., Harris, T. R., and Hammock, B. D. (2003) Proc. Natl. Acad. Sci. U.S.A. 100, 1558-1563]. The binding of Mg2+-HPO4 2- to the N-terminal domain of human sEH in its CIU complex reveals structural features relevant to those of the enzyme-substrate complex in the phosphatase reaction.",
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