4HU8

Crystal Structure of a Bacterial Ig-like Domain Containing GH10 Xylanase from Termite Gut


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 

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This is version 1.1 of the entry. See complete history


Literature

Biochemical characterization and crystal structure of a GH10 xylanase from termite gut bacteria reveal a novel structural feature and significance of its bacterial Ig-like domain.

Han, Q.Liu, N.Robinson, H.Cao, L.Qian, C.Wang, Q.Xie, L.Ding, H.Wang, Q.Huang, Y.Li, J.Zhou, Z.

(2013) Biotechnol Bioeng 110: 3093-3103

  • DOI: 10.1002/bit.24982
  • Primary Citation of Related Structures:  
    4HU8

  • PubMed Abstract: 
  • Bacterial Ig-like (Big) domains are commonly distributed in glycoside hydrolases (GH), but their structure and function remains undefined. Xylanase is a GH, and catalyzes the hydrolysis of the internal β-xylosidic linkages of xylan. In this study, we rep ...

    Bacterial Ig-like (Big) domains are commonly distributed in glycoside hydrolases (GH), but their structure and function remains undefined. Xylanase is a GH, and catalyzes the hydrolysis of the internal β-xylosidic linkages of xylan. In this study, we report the molecular cloning, biochemical and biophysical characterization, and crystal structure of a termite gut bacterial xylanase, Xyl-ORF19, which was derived from gut bacteria of a wood-feeding termite (Globitermes brachycerastes). The protein architecture of Xyl-ORF19 reveals that it has two domains, a C-terminal GH10 catalytic domain and an N-terminal Big_2 non-catalytic domain. The catalytic domain folds in an (α/β)8 barrel as most GH10 xylanases do, but it has two extra β-strands. The non-catalytic domain is structurally similar to an immunoglobulin-like domain of intimins. The recombinant enzyme without the non-catalytic domain has fairly low catalytic activity, and is different from the full-length enzyme in kinetic parameters, pH and temperature profiles, which suggests the non-catalytic domain could affect the enzyme biochemical and biophysical properties as well as the role for enzyme localization. This study provides a molecular basis for future efforts in xylanase bioengineering.


    Organizational Affiliation

    Department of Biochemistry, Virginia Tech, Blacksburg, Virginia, 24061.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GH10 Xylanase ABCDEFGH456Globitermes brachycerastesMutation(s): 0 
EC: 3.2.1.8
Find proteins for K7PDC1 (uncultured bacterium 35A20)
Explore K7PDC1 
Go to UniProtKB:  K7PDC1
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.685α = 92.96
b = 86.963β = 90.86
c = 246.433γ = 108.56
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-18
    Type: Initial release
  • Version 1.1: 2013-11-06
    Changes: Database references