The Enzyme Database

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Accepted name: bis-γ-glutamylcystine reductase
Reaction: 2 γ-glutamylcysteine + NADP+ = bis-γ-glutamylcystine + NADPH + H+
Other name(s): NADPH2:bis-γ-glutamylcysteine oxidoreductase; GSR
Systematic name: γ-glutamylcysteine:NADP+ oxidoreductase
Comments: Contains FAD. The enzyme, which is found only in halobacteria, maintains the concentration of γ-glutamylcysteine, the major low molecular weight thiol in halobacteria. Not identical with EC (glutathione-disulfide reductase) or EC (CoA-disulfide reductase).
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 117056-54-9
1.  Sundquist, A.R. and Fahey, R.C. The novel disulfide reductase bis-γ-glutamylcystine reductase and dihydrolipoamide dehydrogenase from Halobacterium halobium: purification by immobilized-metal-ion affinity chromatography and properties of the enzymes. J. Bacteriol. 170 (1988) 3459–3467. [PMID: 3136140]
2.  Sundquist, A.R. and Fahey, R.C. The function of γ-glutamylcysteine and bis-γ-glutamylcystine reductase in Halobacterium halobium. J. Biol. Chem. 264 (1989) 719–725. [PMID: 2910862]
3.  Kim, J. and Copley, S.D. The orphan protein bis-γ-glutamylcystine reductase joins the pyridine nucleotide disulfide reductase family. Biochemistry 52 (2013) 2905–2913. [PMID: 23560638]
[EC created 1992 as EC, transferred 2002 to EC, modified 2013]

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