Apo structure of a beta-glucosidase 1317

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 

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Improving the cellobiose-hydrolysis activity and glucose-tolerance of a thermostable beta-glucosidase through rational design.

Liu, X.Cao, L.Zeng, J.Liu, Y.Xie, W.

(2019) Int J Biol Macromol 136: 1052-1059

  • DOI: https://doi.org/10.1016/j.ijbiomac.2019.06.029
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    β-Glucosidase is the rate-limiting component of a cellulase-hydrolyzing reaction. Thermostability and glucose-tolerance are two critical criteria of the enzyme, which practically determine its performance in industrial applications. In this study, a thermostable and glucose-tolerant β-glucosidase (named Bgl1317) belonging to the glycoside hydrolase family 1 was acquired from a metagenomic library of Turpan soil through functional screening. Bgl1317 showed excellent thermostability and glucose-tolerance and its crystal structure was subsequently determined at a high resolution. Rational design based on the structure was conducted, producing three beneficial mutations A397R, L188A and A262S. While A397R improved the cellobiose activity by 80%, L188A and A262S increased the IC 50 value of glucose from 0.8 to 1.5 M. The residues that may play a role in glucose-tolerance of GH1 β-glucosidases were summarized and the performances of glucose-tolerant β-glucosidases reported in recent years were discussed and compared. This study provides insights into enzymatic properties of Bgl1317 for engineering it into a powerful catalyst and β-glucosidases in general.

  • Organizational Affiliation

    MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory for Biocontrol, School of Life Sciences, The Sun Yat-Sen University, Guangzhou, Guangdong 510006, People's Republic of China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
beta-glucosidase 1317446uncultured bacteriumMutation(s): 0 
Find proteins for A0A5H1ZR35 (uncultured bacterium)
Explore A0A5H1ZR35 
Go to UniProtKB:  A0A5H1ZR35
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A5H1ZR35
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on TRS

Download Ideal Coordinates CCD File 
C4 H12 N O3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 
  • Space Group: P 62
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.99α = 90
b = 122.99β = 90
c = 48.76γ = 120
Software Package:
Software NamePurpose
CrysalisProdata reduction
SCALAdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31700657

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-24
    Type: Initial release
  • Version 1.1: 2023-11-22
    Changes: Data collection, Database references, Refinement description