1K0A

Ure2p in Complex with S-hexylglutathione

1K0A の概要

• エントリーDOI: 10.2210/pdb1k0a/pdb
• 関連するPDBエントリー: 1G6W 1JZR 1K0B 1K0C 1K0D
• 分子名称: URE2 PROTEIN, S-HEXYLGLUTATHIONE, GLUTATHIONE, ... (4 entities in total)
• 機能のキーワード: nitrate assimilation, structural genomics, gene regulation
• 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: 60369.63

構造登録者

Bousset, L.,Belrhali, H.,Melki, R.,Morera, S. (登録日: 2001-09-19, 公開日: 2001-12-21, 最終更新日: 2024-02-07)

主引用文献

Bousset, L.,Belrhali, H.,Melki, R.,Morera, S.
Crystal structures of the yeast prion Ure2p functional region in complex with glutathione and related compounds.
Biochemistry, 40:13564-13573, 2001

PubMed Abstract: The [URE3] phenotype in yeast Saccharomyces cerevisiae is due to an altered prion form of Ure2p, a protein involved in nitrogen catabolism. To understand possible conformational changes at the origin of prion propagation, we previously solved the crystal structure of the Ure2p functional region [Bousset et al. (2001) Structure 9, 39-46]. We showed the protein to have a fold similar to that of the beta class of glutathione S-transferases (GSTs). Here we report crystal structures of the Ure2p functional region (extending from residues 95-354) in complex with glutathione (GSH), the substrate of all GSTs, and two widely used GST inhibitors, namely, S-hexylglutathione and S-p-nitrobenzylglutathione. In a manner similar to what is observed in many GSTs, ligand binding is not accompanied by a significant change in the conformation of the protein. We identify one GSH and one hydrophobic electrophile binding site per monomer as observed in all other GSTs. The sulfur group of GSH, that conjugates electrophiles, is located near the amide group of Asn124, allowing a hydrogen bond to be formed. Biochemical data indicate that GSH binds to Ure2p with high affinity. Its binding affects Ure2p oligomerization but has no effect on the assembly of the protein into amyloid fibrils. Despite results indicating that Ure2p lacks GST activity, we propose that Ure2p is a member of the GST superfamily that may describe a novel GST class. Our data bring new insights into the function of the Ure2p active region.

PubMed: 11695904
DOI: 10.1021/bi011007b

実験手法

X-RAY DIFFRACTION (2.5 Å)