2NTO

Structure of the Glutathione Transferase from Ochrobactrum anthropi in complex with glutathione

2NTO の概要

• エントリーDOI: 10.2210/pdb2nto/pdb
• 分子名称: glutathione S-transferase, SULFATE ION, GLUTATHIONE, ... (4 entities in total)
• 機能のキーワード: n-terminal alpha+beta domain; c-terminal all helical domain, transferase
• 由来する生物種: Ochrobactrum anthropi
• 細胞内の位置: Cytoplasm (By similarity): P81065
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 22167.21

構造登録者

Federici, L.,Bonivento, D.,Di Matteo, A.,Allocati, N. (登録日: 2006-11-08, 公開日: 2007-09-25, 最終更新日: 2023-08-30)

主引用文献

Federici, L.,Masulli, M.,Bonivento, D.,Di Matteo, A.,Gianni, S.,Favaloro, B.,Di Ilio, C.,Allocati, N.
Role of Ser11 in the stabilization of the structure of Ochrobactrum anthropi glutathione transferase
Biochem.J., 403:267-274, 2007

PubMed Abstract: GSTs (glutathione transferases) are a multifunctional group of enzymes, widely distributed and involved in cellular detoxification processes. In the xenobiotic-degrading bacterium Ochrobactrum anthropi, GST is overexpressed in the presence of toxic concentrations of aromatic compounds such as 4-chlorophenol and atrazine. We have determined the crystal structure of the GST from O. anthropi (OaGST) in complex with GSH. Like other bacterial GSTs, OaGST belongs to the Beta class and shows a similar binding pocket for GSH. However, in contrast with the structure of Proteus mirabilis GST, GSH is not covalently bound to Cys10, but is present in the thiolate form. In our investigation of the structural basis for GSH stabilization, we have identified a conserved network of hydrogen-bond interactions, mediated by the presence of a structural water molecule that links Ser11 to Glu198. Partial disruption of this network, by mutagenesis of Ser11 to alanine, increases the K(m) for GSH 15-fold and decreases the catalytic efficiency 4-fold, even though Ser11 is not involved in GSH binding. Thermal- and chemical-induced unfolding studies point to a global effect of the mutation on the stability of the protein and to a central role of these residues in zippering the terminal helix of the C-terminal domain to the starting helix of the N-terminal domain.

PubMed: 17223798
DOI: 10.1042/BJ20061707

実験手法

X-RAY DIFFRACTION (2.095 Å)