6KMO

Crystal structure of a novel esterase CinB from Enterobacter asburiae

6KMO の概要

• エントリーDOI: 10.2210/pdb6kmo/pdb
• 分子名称: Alpha/beta hydrolase (2 entities in total)
• 機能のキーワード: enterobacter asburiae, esterase, cinb, hydrolase
• 由来する生物種: Enterobacter asburiae
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 72700.21

構造登録者

Shang, F.,Xu, Y. (登録日: 2019-07-31, 公開日: 2019-09-04, 最終更新日: 2024-03-27)

主引用文献

Shang, F.,Lan, J.,Liu, W.,Chen, Y.,Wang, L.,Zhao, J.,Chen, J.,Gao, P.,Ha, N.C.,Quan, C.,Nam, K.H.,Xu, Y.
Structural and functional analyses of the lipase CinB from Enterobacter asburiae.
Biochem.Biophys.Res.Commun., 519:274-279, 2019

PubMed Abstract: Lipases are widely present in various plants, animals and microorganisms, constituting a large category of enzymes. They have the ability to catalyze the cleavage of ester bonds. The lipase CinB from Enterobacter asburiae (E. asburiae) is an acetyl esterase. The primary amino acid sequence suggests that the EaCinB protein belongs to the α/β-hydrolase (ABH) superfamily of the esterase/lipase superfamily. However, its molecular functions have not yet been determined. Here, we report the crystal structure of E. asburiae CinB at a 1.45 Å resolution. EaCinB contains a signal peptide, cap domain and catalytic domain. The active site of EaCinB contains the catalytic triad (Ser180-His307-Asp277) on the catalytic domain. The oxyanion hole is composed of Gly106 and Gly107 within the conserved sequence motif HGGG (amino acid residues 106-109). The substrate is accessible between the α1 and α2 helices or the α1 helix and catalytic domain. Narrow substrate pockets are formed by the α2 helix of the cap domain. Site-directed mutagenesis showed that EaCinB-W208H exhibits a higher catalytic ability than EaCinB-WT by approximately nine times. Our results provide insight into the molecular function of EaCinB.

PubMed: 31493870
DOI: 10.1016/j.bbrc.2019.08.166

実験手法

X-RAY DIFFRACTION (1.45 Å)