2CQS

Crystal Structure of Cellvibrio gilvus Cellobiose Phosphorylase Crystallized from Ammonium Sulfate

2CQS の概要

• エントリーDOI: 10.2210/pdb2cqs/pdb
• 関連するPDBエントリー: 2CQT
• 分子名称: Cellobiose Phosphorylase, beta-D-glucopyranose, SULFATE ION, ... (4 entities in total)
• 機能のキーワード: beta-sandwich, (alpha/alpha)6 barrel, transferase
• 由来する生物種: Cellvibrio gilvus
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 186696.05

構造登録者

Hidaka, M.,Kitaoka, M.,Hayashi, K.,Wakagi, T.,Shoun, H.,Fushinobu, S. (登録日: 2005-05-20, 公開日: 2006-05-16, 最終更新日: 2023-10-25)

主引用文献

Hidaka, M.,Kitaoka, M.,Hayashi, K.,Wakagi, T.,Shoun, H.,Fushinobu, S.
Structural dissection of the reaction mechanism of cellobiose phosphorylase.
Biochem.J., 398:37-43, 2006

PubMed Abstract: Cellobiose phosphorylase, a member of the glycoside hydrolase family 94, catalyses the reversible phosphorolysis of cellobiose into alpha-D-glucose 1-phosphate and D-glucose with inversion of the anomeric configuration. The substrate specificity and reaction mechanism of cellobiose phosphorylase from Cellvibrio gilvus have been investigated in detail. We have determined the crystal structure of the glucose-sulphate and glucose-phosphate complexes of this enzyme at a maximal resolution of 2.0 A (1 A=0.1 nm). The phosphate ion is strongly held through several hydrogen bonds, and the configuration appears to be suitable for direct nucleophilic attack to an anomeric centre. Structural features around the sugar-donor and sugar-acceptor sites were consistent with the results of extensive kinetic studies. When we compared this structure with that of homologous chitobiose phosphorylase, we identified key residues for substrate discrimination between glucose and N-acetylglucosamine in both the sugar-donor and sugar-acceptor sites. We found that the active site pocket of cellobiose phosphorylase was covered by an additional loop, indicating that some conformational change is required upon substrate binding. Information on the three-dimensional structure of cellobiose phosphorylase will facilitate engineering of this enzyme, the application of which to practical oligosaccharide synthesis has already been established.

PubMed: 16646954
DOI: 10.1042/BJ20060274

実験手法

X-RAY DIFFRACTION (2 Å)