5KVC

Thermostable mutant of halohydrin dehalogenase (HheC)

5KVC の概要

• エントリーDOI: 10.2210/pdb5kvc/pdb
• 分子名称: Halohydrin dehalogenase, CHLORIDE ION, IMIDAZOLE, ... (6 entities in total)
• 機能のキーワード: thermostable mutant, engineered mutant, lyase
• 由来する生物種: Rhizobium radiobacter (Agrobacterium tumefaciens)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 57180.23

構造登録者

Dal Lago, M.,Terwisscha van Scheltinga, A.C. (登録日: 2016-07-14, 公開日: 2017-01-11, 最終更新日: 2024-01-10)

主引用文献

Arabnejad, H.,Dal Lago, M.,Jekel, P.A.,Floor, R.J.,Thunnissen, A.W.H.,Terwisscha van Scheltinga, A.C.,Wijma, H.J.,Janssen, D.B.
A robust cosolvent-compatible halohydrin dehalogenase by computational library design.
Protein Eng. Des. Sel., 30:173-187, 2017

PubMed Abstract: To improve the applicability of halohydrin dehalogenase as a catalyst for reactions in the presence of organic cosolvents, we explored a computational library design strategy (Framework for Rapid Enzyme Stabilization by Computational libraries) that involves discovery and in silico evaluation of stabilizing mutations. Energy calculations, disulfide bond predictions and molecular dynamics simulations identified 218 point mutations and 35 disulfide bonds with predicted stabilizing effects. Experiments confirmed 29 stabilizing point mutations, most of which were located in two distinct regions, whereas introduction of disulfide bonds was not effective. Combining the best mutations resulted in a 12-fold mutant (HheC-H12) with a 28°C higher apparent melting temperature and a remarkable increase in resistance to cosolvents. This variant also showed a higher optimum temperature for catalysis while activity at low temperature was preserved. Mutant H12 was used as a template for the introduction of mutations that enhance enantioselectivity or activity. Crystal structures showed that the structural changes in the H12 mutant mostly agreed with the computational predictions and that the enhanced stability was mainly due to mutations that redistributed surface charges and improved interactions between subunits, the latter including better interactions of water molecules at the subunit interfaces.

PubMed: 27999093
DOI: 10.1093/protein/gzw068

実験手法

X-RAY DIFFRACTION (1.501 Å)