2JKA

Native structure of a family 97 alpha-glucosidase from Bacteroides thetaiotaomicron

2JKA の概要

• エントリーDOI: 10.2210/pdb2jka/pdb
• 関連するPDBエントリー: 2JKE 2JKP
• 分子名称: ALPHA-GLUCOSIDASE (ALPHA-GLUCOSIDASE SUSB), CALCIUM ION, 1,2-ETHANEDIOL, ... (4 entities in total)
• 機能のキーワード: hydrolase, family 97, alpha-glucosidase, glycoside hydrolase, bacteroides thetaiotaomicron
• 由来する生物種: BACTEROIDES THETAIOTAOMICRON
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 167191.28

構造登録者

Gloster, T.M.,Turkenburg, J.P.,Potts, J.R.,Henrissat, B.,Davies, G.J. (登録日: 2008-08-23, 公開日: 2008-09-30, 最終更新日: 2024-05-08)

主引用文献

Gloster, T.M.,Turkenburg, J.P.,Potts, J.R.,Henrissat, B.,Davies, G.J.
Divergence of Catalytic Mechanism within a Glycosidase Family Provides Insight Into Evolution of Carbohydrate Metabolism by Human Gut Flora.
Chem.Biol., 15:1058-, 2008

PubMed Abstract: Enzymatic cleavage of the glycosidic bond yields products in which the anomeric configuration is either retained or inverted. Each mechanism reflects the dispositions of the enzyme functional groups; a facet of which is essentially conserved in 113 glycoside hydrolase (GH) families. We show that family GH97 has diverged significantly, as it contains both inverting and retaining alpha-glycosidases. This reflects evolution of the active center; a glutamate acts as a general base in inverting members, exemplified by Bacteroides thetaiotaomicron alpha-glucosidase BtGH97a, whereas an aspartate likely acts as a nucleophile in retaining members. The structure of BtGH97a and its complexes with inhibitors, coupled to kinetic analysis of active-site variants, reveals an unusual calcium ion dependence. 1H NMR analysis shows an inversion mechanism for BtGH97a, whereas another GH97 enzyme from B. thetaiotaomicron, BtGH97b, functions as a retaining alpha-galactosidase.

PubMed: 18848471
DOI: 10.1016/J.CHEMBIOL.2008.09.005

実験手法

X-RAY DIFFRACTION (1.9 Å)