7E56

The mutant crystal structure of endo-polygalacturonase (T316C/G344C) from Talaromyces leycettanus JCM 12802


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Cysteine Engineering of an Endo-polygalacturonase from Talaromyces leycettanus JCM 12802 to Improve Its Thermostability.

Wang, S.Meng, K.Su, X.Hakulinen, N.Wang, Y.Zhang, J.Luo, H.Yao, B.Huang, H.Tu, T.

(2021) J Agric Food Chem 69: 6351-6359

  • DOI: https://doi.org/10.1021/acs.jafc.1c01618
  • Primary Citation of Related Structures:  
    7E56

  • PubMed Abstract: 

    Thermostable enzymes have many advantages for industrial applications. Therefore, in this study, computer-aided design technology was used to improve the thermostability of a highly active endo-polygalacturonase from Talaromyces leycettanus JCM12802 at an optimal temperature of 70 °C. The melting temperature and specific activity of the obtained mutant T316C/G344C were increased by 10 °C and 36.5%, respectively, compared with the wild-type enzyme. The crystal structure of the T316C/G344C mutant showed no formation of a disulfide bond between the introduced cysteines, indicating a different mechanism than the conventional mechanism underlying improved enzyme thermostability. The cysteine substitutions directly formed a new alkyl hydrophobic interaction and caused conformational changes in the side chains of the adjacent residues Asn315 and Thr343, which in turn caused a local reconstruction of hydrogen bonds. This method greatly improved the thermostability of the enzyme without affecting its activity; thus, our findings are of great significance for both theoretical research and practical applications.


  • Organizational Affiliation

    State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endo-polygalacturonase336Evansstolkia leycettanaMutation(s): 2 
Gene Names: TlPGA
EC: 3.2.1.15
UniProt
Find proteins for A0A6M9BP13 (Evansstolkia leycettana)
Explore A0A6M9BP13 
Go to UniProtKB:  A0A6M9BP13
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A6M9BP13
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.547α = 90
b = 68.707β = 90
c = 88.319γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31702145

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-25
    Type: Initial release
  • Version 1.1: 2022-03-09
    Changes: Database references
  • Version 1.2: 2023-11-29
    Changes: Data collection, Refinement description