2r9z
From Proteopedia
Glutathione amide reductase from Chromatium gracile
Structural highlights
FunctionGASHR_MARGR Catalyzes the reduction of glutathione amide disulfide (GASSAG) to restore glutathione amide (GASH) in the presence of NADH. May play a role in GASH metabolism under anaerobic conditions as a sulfide carrier necessary for cytoplasmic sulfide oxidation.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedGlutathione reductase (GR) plays a vital role in maintaining the antioxidant levels of the cytoplasm by catalyzing the reduction of glutathione disulfide to reduced glutathione, thereby using NADPH and flavin adenine dinucleotide as cofactors. Chromatiaceae have evolved an unusual homolog that prefers both a modified substrate (glutathione amide disulfide [GASSAG]) and a different cofactor (NADH). Herein, we present the crystal structure of the Chromatium gracile glutathione amide reductase (GAR) both alone and in complex with NAD(+). An altered charge distribution in the GASSAG binding pocket explains the difference in substrate specificity. The NADH binding pocket of GAR differs from that of wild-type GR as well as that of a low active GR that was engineered to mimic NADH binding. Based on the GAR structure, we propose two attractive rationales for producing an efficient GR enzyme with NADH specificity. Understanding nicotinamide dinucleotide cofactor and substrate specificity in class I flavoprotein disulfide oxidoreductases: crystallographic analysis of a glutathione amide reductase.,Van Petegem F, De Vos D, Savvides S, Vergauwen B, Van Beeumen J J Mol Biol. 2007 Dec 7;374(4):883-9. Epub 2007 Sep 29. PMID:17977556[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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