4FQU

Glutathionyl-Hydroquinone Reductase PcpF of Sphingobium chlorophenolicum

4FQU の概要

• エントリーDOI: 10.2210/pdb4fqu/pdb
• 分子名称: Putative glutathione transferase (2 entities in total)
• 機能のキーワード: glutathionyl-hydroquinone reductases, transferase, oxidoreductase
• 由来する生物種: Sphingobium chlorophenolicum
• タンパク質・核酸の鎖数: 8
• 化学式量合計: 283383.10

構造登録者

Green, A.R.,Hayes, R.P.,Xun, L.,Kang, C. (登録日: 2012-06-25, 公開日: 2012-09-12, 最終更新日: 2024-02-28)

主引用文献

Green, A.R.,Hayes, R.P.,Xun, L.,Kang, C.
Structural understanding of the glutathione-dependent reduction mechanism of glutathionyl-hydroquinone reductases.
J.Biol.Chem., 287:35838-35848, 2012

PubMed Abstract: Glutathionyl-hydroquinone reductases (GS- HQRs) are a newly identified group of glutathione transferases, and they are widely distributed in bacteria, halobacteria, fungi, and plants. GS-HQRs catalyze glutathione (GSH)-dependent reduction of glutathionyl-hydroquinones (GS-hydroquinones) to hydroquinones. GS-hydroquinones can be spontaneously formed from benzoquinones reacting with reduced GSH via Michael addition, and GS-HQRs convert the conjugates to hydroquinones. In this report we have determined the structures of two bacterial GS-HQRs, PcpF of Sphingobium chlorophenolicum and YqjG of Escherichia coli. The two structures and the previously reported structure of a fungal GS-HQR shared many features and displayed complete conservation for all the critical residues. Furthermore, we obtained the binary complex structures with GS-menadione, which in its reduced form, GS-menadiol, is a substrate. The structure revealed a large H-site that could accommodate various substituted hydroquinones and a hydrogen network of three Tyr residues that could provide the proton for reductive deglutathionylation. Mutation of the Tyr residues and the position of two GSH molecules confirmed the proposed mechanism of GS-HQRs. The conservation of GS-HQRs across bacteria, halobacteria, fungi, and plants potentiates the physiological role of these enzymes in quinone metabolism.

PubMed: 22955277
DOI: 10.1074/jbc.M112.395541

実験手法

X-RAY DIFFRACTION (3 Å)