2HQM

Crystal Structure of Glutathione Reductase Glr1 from the Yeast Saccharomyces cerevisiae

2HQM の概要

• エントリーDOI: 10.2210/pdb2hqm/pdb
• 分子名称: Glutathione reductase, 2-acetamido-2-deoxy-beta-D-glucopyranose, PHOSPHATE ION, ... (7 entities in total)
• 機能のキーワード: glutathione reductase complexed with fad, oxidoreductase
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 110153.47

構造登録者

Yu, J.,Zhou, C.Z. (登録日: 2006-07-19, 公開日: 2007-06-12, 最終更新日: 2023-10-25)

主引用文献

Yu, J.,Zhou, C.Z.
Crystal structure of glutathione reductase Glr1 from the yeast Saccharomyces cerevisiae.
Proteins, 68:972-979, 2007

PubMed Abstract: Yeast glutathione (GSH) reductase Glr1 is a dimeric flavo-oxidoreductase involved in cytoplasmic and mitochondrial redox regulatory systems. It reduces the oxidized GSH GSSG to the reduced form, GSH with NADPH as electron donor and FAD as coenzyme. Crystal structures and enzymatic mechanisms of GSH reductases from Escherichia coli and Homo sapiens have been well investigated, whereas the structural properties of yeast Glr1 remain unknown. Herein, we overexpressed Saccharomyces cerevisiae Glr1 in Pichia pastoris GS115 and determined its crystal structure at 2.40 A resolution. Although the overall structure and the active site are much conserved, obvious variety was found at the interface of Glr1 monomers when superimposed against the homolog from E. coli or human. The nonconserved C239 is exposed to the solvent and accessible to GSH or GSSG enriched in a microenvironment around the Glr1 molecules, leading to the partial and transient glutathionylation, as primarily identified from the 2Fo-Fc electron density map and further confirmed by biochemical assays. Meanwhile N278 at the vicinity of NADP-binding pocket was artificially glycosylated when heterogeneously overexpressed in P. pastoris. The highly motile oligosaccharide chain linked to N278 of the recombinant Glr1 interferes with the entry of NADPH, which results in a dramatic increase of Km for NAPDH and a significant decrease of turnover number, when compared with the native protein.

PubMed: 17554778
DOI: 10.1002/prot.21354

実験手法

X-RAY DIFFRACTION (2.4 Å)