3AUT

Crystal structure of Bacillus megaterium glucose dehydrogenase 4 in complex with NADH

3AUT の概要

• エントリーDOI: 10.2210/pdb3aut/pdb
• 関連するPDBエントリー: 3AUS 3AUU 3AY6 3AY7
• 分子名称: Glucose 1-dehydrogenase 4, 1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE (3 entities in total)
• 機能のキーワード: rossmann fold, oxidoreductase, nad, oxidation-reduction process, cytosol
• 由来する生物種: Bacillus megaterium
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 59063.57

構造登録者

Nishioka, T.,Yasutake, Y.,Nishiya, Y.,Tamura, T. (登録日: 2011-02-16, 公開日: 2012-02-22, 最終更新日: 2024-03-13)

主引用文献

Nishioka, T.,Yasutake, Y.,Nishiya, Y.,Tamura, T.
Structure-guided mutagenesis for the improvement of substrate specificity of Bacillus megaterium glucose 1-dehydrogenase IV
Febs J., 279:3264-3275, 2012

PubMed Abstract: Bacillus megaterium IAM 1030 (Bacillus sp. JCM 20016) possesses four d-glucose 1-dehydrogenase isozymes (BmGlcDH-I, -II, -III and -IV) that belong to the short-chain dehydrogenase/reductase superfamily. The BmGlcDHs are currently used for a clinical assay to examine blood glucose levels. Of these four isozymes, BmGlcDH-IV has relatively high thermostability and catalytic activity, but the disadvantage of its broad substrate specificity remains to be overcome. Here, we describe the crystal structures of BmGlcDH-IV in ligand-free, NADH-bound and β-D-glucose-bound forms to a resolution of 2.0 Å. No major conformational differences were found among these structures. The structure of BmGlcDH-IV in complex with β-D-glucose revealed that the carboxyl group at the C-terminus, derived from a neighboring subunit, is inserted into the active-site pocket and directly interacts with β-D-glucose. A site-directed mutagenic study showed that destabilization of the BmGlcDH-IV C-terminal region by substitution with more bulky and hydrophobic amino acid residues greatly affects the activity of the enzyme, as well as its thermostability and substrate specificity. Of the six mutants created, the G259A variant exhibited the narrowest substrate specificity, whilst retaining comparable catalytic activity and thermostability to the wild-type enzyme.

PubMed: 22804868
DOI: 10.1111/j.1742-4658.2012.08713.x

実験手法

X-RAY DIFFRACTION (2 Å)