5GYG

Crystal structure of ENZbleach xylanase T28C+T60C mutant with three N-teminal residue truncation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure-based protein engineering for thermostable and alkaliphilic enhancement of endo-beta-1,4-xylanase for applications in pulp bleaching.

Boonyapakron, K.Jaruwat, A.Liwnaree, B.Nimchua, T.Champreda, V.Chitnumsub, P.

(2017) J Biotechnol 259: 95-102

  • DOI: 10.1016/j.jbiotec.2017.07.035
  • Primary Citation of Related Structures:  
    5GV1, 5GYB, 5GYA, 5GYC, 5GYF, 5GYE, 5GY8, 5GY9, 5GYH, 5GYG, 5GYI

  • PubMed Abstract: 
  • In the pulp bleaching industry, enzymes with robust activity at high pH and temperatures are desirable for facilitating the pre-bleaching process with simplified processing and minimal use of chlorinated compounds. To engineer an enzyme for this purpose, we determined the crystal structure of the Xyn12 ...

    In the pulp bleaching industry, enzymes with robust activity at high pH and temperatures are desirable for facilitating the pre-bleaching process with simplified processing and minimal use of chlorinated compounds. To engineer an enzyme for this purpose, we determined the crystal structure of the Xyn12.2 xylanase, a xylan-hydrolyzing enzyme derived from the termite gut symbiont metagenome, as the basis for structure-based protein engineering to improve Xyn12.2 stability in high heat and alkaline conditions. Engineered cysteine pairs that generated exterior disulfide bonds increased the k cat of Xyn12.2 variants and melting temperature at all tested conditions. These improvements led to up to 4.2-fold increases in catalytic efficiency at pH 9.0, 50°C for 1h and up to 3-fold increases at 60°C. The most effective variants, XynTT and XynTTTE, exhibited 2-3-fold increases in bagasse hydrolysis at pH 9.0 and 60°C compared to the wild-type enzyme. Overall, engineering arginines and phenylalanines for increased pK a and hydrogen bonding improved enzyme catalytic efficiency at high stringency conditions. These modifications were the keys to enhancing thermostability and alkaliphilicity in our enzyme variants, with XynTT and XynTTTE being especially promising for their application to the pulp and paper industry.


    Organizational Affiliation

    Biomolecular Analysis and Application Laboratory, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Thailand Science Park, Klong Luang, Pathumthani 12120, Thailand. Electronic address: penchit@biotec.or.th.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Endo-1,4-beta-xylanaseA, B278termite gut metagenomeMutation(s): 0 
EC: 3.2.1.8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.74 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.253α = 90
b = 70.886β = 90.23
c = 85.254γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Center for Genetic Engineering and BiotechnologyThailand--

Revision History  (Full details and data files)

  • Version 1.0: 2017-09-27
    Type: Initial release
  • Version 1.1: 2019-04-10
    Changes: Data collection, Database references