3gx0
From Proteopedia
Crystal Structure of GSH-dependent Disulfide bond Oxidoreductase
Structural highlights
Function[YFCG_ECOLI] Exhibits a very robust glutathione (GSH)-dependent disulfide-bond reductase activity toward the model substrate, 2-hydroxyethyl disulfide; the actual physiological substrates are not known. Has also a low GSH-dependent hydroperoxidase activity toward cumene hydroperoxide, but does not reduce H(2)O(2), tert-butyl hydroperoxide, benzyl peroxide, or lauroyl peroxide. Exhibits little or no GSH transferase activity with most typical electrophilic substrates, and has no detectable transferase activity using glutathionylspermidine (GspSH) as the nucleophilic substrate. Is involved in defense against oxidative stress, probably via its peroxidase activity.[1] [2] 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 PubMedYfcG is one of eight glutathione (GSH) transferase homologues encoded in the Escherichia coli genome. The protein exhibits low or no GSH transferase activity toward a panel of electrophilic substrates. In contrast, it has a very robust disulfide-bond reductase activity toward 2-hydroxyethyldisulfide on par with mammalian and bacterial glutaredoxins. The structure of YfcG at 2.3 A-resolution from crystals grown in the presence of GSH reveals a molecule of glutathione disulfide in the active site. The crystallographic results and the lack of functional cysteine residues in the active site of YfcG suggests that the reductase activity is unique in that no sulfhydryl groups in the YfcG protein are covalently involved in the redox chemistry. Analysis of the Structure and Function of YfcG from Escherichia coli Reveals an Efficient and Unique Disulfide Bond Reductase.,Wadington MC, Ladner JE, Stourman NV, Harp JM, Armstrong RN Biochemistry. 2009 Jun 23. PMID:19537707[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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