Identification, characterization, and crystal structure of the omega class glutathione transferases

P. G. Board*, M. Coggan, G. Chelvanayagam, S. Easteal, L. S. Jermiin, G. K. Schulte, D. E. Danley, L. R. Hoth, M. C. Griffor, A. V. Kamath, M. H. Rosner, B. A. Chrunyk, D. E. Perregaux, C. A. Gabel, K. F. Geoghegan, J. Pandit

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

631 Citations (Scopus)

Abstract

A new class of glutathione transferases has been discovered by analysis of the expressed sequence tag data base and sequence alignment. Glutathione S-transferases (GSTs) of the new class, named Omega, exist in several mammalian species and Caenorhabditis elegans. In humans, GSTO 1-1 is expressed in most tissues and exhibits glutathione-dependent thiol transferase and dehydroascorbate reductase activities characteristic of the glutaredoxins. The structure of GSTO 1-1 has been determined at 2.0-Å resolution and has a characteristic GST fold (Protein Data Bank entry code leem). The Omega class GSTs exhibit an unusual N-terminal extension that abuts the C terminus to form a novel structural unit, Unlike other mammalian GSTs, GSTO 1-1 appears to have an active site cysteine that can form a disulfide bond with glutathione.

Original languageEnglish
Pages (from-to)24798-24806
Number of pages9
JournalJournal of Biological Chemistry
Volume275
Issue number32
DOIs
Publication statusPublished - 11 Aug 2000

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