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 U S A 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 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 ...
The crystal structure of recombinant murine liver cytosolic epoxide hydrolase (EC 126.96.36.199) 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.