Detoxification of environmental mutagens and carcinogens: structure, mechanism, and evolution of liver epoxide hydrolase.Argiriadi, M.A., Morisseau, C., Hammock, B.D., Christianson, D.W.
(1999) Proc.Natl.Acad.Sci.USA 96: 10637-10642
- PubMed: 10485878
- DOI: 10.1073/pnas.96.19.10637
- Primary Citation of Related Structures:
- PubMed Abstract:
- Molecular cloning and expression of murine liver soluble epoxide hydrolase
Grant, D.F.,Storms, D.H.,Hammock, B.D.
(1993) J.Biol.Chem. 268: 17628
- Gene evolution of epoxide hydrolases and recommended nomenclature
Beetham, J.K.,Grant, D.,Arand, M.,Garbarino, J.,Kiyosue, T.,Pinot, F.,Oesch, F.,Belknap, W.R.,Shinozaki, K.,Hammock, B.D.
(1995) DNA Cell Biol. 14: 61
The crystal structure of recombinant murine liver cytosolic epoxide hydrolase (EC 18.104.22.168) has been determined at 2.8-A resolution. The binding of a nanomolar affinity inhibitor confirms the active site location in the C-terminal domain; this domain ...
The crystal structure of recombinant murine liver cytosolic epoxide hydrolase (EC 22.214.171.124) has been determined at 2.8-A resolution. The binding of a nanomolar affinity inhibitor confirms the active site location in the C-terminal domain; this domain is similar to that of haloalkane dehalogenase and shares the alpha/beta hydrolase fold. A structure-based mechanism is proposed that illuminates the unique chemical strategy for the activation of endogenous and man-made epoxide substrates for hydrolysis and detoxification. Surprisingly, a vestigial active site is found in the N-terminal domain similar to that of another enzyme of halocarbon metabolism, haloacid dehalogenase. Although the vestigial active site does not participate in epoxide hydrolysis, the vestigial domain plays a critical structural role by stabilizing the dimer in a distinctive domain-swapped architecture. Given the genetic and structural relationships among these enzymes of xenobiotic metabolism, a structure-based evolutionary sequence is postulated.
Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA.