5EB4

The crystal structure of almond HNL, PaHNL5 V317A, expressed in Aspergillus niger

5EB4 の概要

• エントリーDOI: 10.2210/pdb5eb4/pdb
• 分子名称: Hnl isoenzyme 5, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (5 entities in total)
• 機能のキーワード: hydroxynitrile lyase, prunus amygdalus, aspergillus niger, lyase
• 由来する生物種: Prunus dulcis (Almond)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 120862.73

構造登録者

Pavkov-Keller, T.,Steinkellner, G.,Gruber, K. (登録日: 2015-10-17, 公開日: 2016-04-20, 最終更新日: 2024-11-06)

主引用文献

Pavkov-Keller, T.,Bakhuis, J.,Steinkellner, G.,Jolink, F.,Keijmel, E.,Birner-Gruenberger, R.,Gruber, K.
Structures of almond hydroxynitrile lyase isoenzyme 5 provide a rationale for the lack of oxidoreductase activity in flavin dependent HNLs.
J.Biotechnol., 235:24-31, 2016

PubMed Abstract: Hydroxynitrile lyases (HNLs) catalyze the asymmetric addition of HCN to aldehydes producing enantiomerically pure cyanohydrins. These enzymes can be heterologously expressed in large quantities making them interesting candidates for industrial applications. The HNLs from Rosaceae evolved from flavin dependent dehydrogenase/oxidase structures. Here we report the high resolution X-ray structure of the highly glycosylated Prunus amygdalus HNL isoenzyme5 (PaHNL5 V317A) expressed in Aspergillus niger and its complex with benzyl alcohol. A comparison with the structure of isoenzyme PaHNL1 indicates a higher accessibility to the active site and a larger cavity for PaHNL5. Additionally, the PaHNL5 complex structure with benzyl alcohol was compared with the structurally related aryl-alcohol oxidase (AAO). Even though both enzymes contain an FAD-cofactor and histidine residues at crucial positions in the active site, PaHNL5 lacks the oxidoreductase activity. The structures indicate that in PaHNLs benzyl alcohol is bound too far away from the FAD cofactor in order to be oxidized.

PubMed: 27067080
DOI: 10.1016/j.jbiotec.2016.04.013

実験手法

X-RAY DIFFRACTION (2.3 Å)