1UKR

STRUCTURE OF ENDO-1,4-BETA-XYLANASE C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional structure of Endo-1,4-beta-xylanase I from Aspergillus niger: molecular basis for its low pH optimum.

Krengel, U.Dijkstra, B.W.

(1996) J.Mol.Biol. 263: 70-78

  • DOI: 10.1006/jmbi.1996.0556

  • PubMed Abstract: 
  • The crystal structure of endo-1,4-beta-xylanase I from Aspergillus niger has been solved by molecular replacement and was refined to 2.4 A resolution. The final R-factor for all data from 6 to 2.4 A is 17.9%. The A. niger xylanase has a characteristi ...

    The crystal structure of endo-1,4-beta-xylanase I from Aspergillus niger has been solved by molecular replacement and was refined to 2.4 A resolution. The final R-factor for all data from 6 to 2.4 A is 17.9%. The A. niger xylanase has a characteristic fold which is unique for family G xylanases (root-mean-square deviation = 1.1 A to Trichoderma reesei xylanase I, which has 53% sequence identity). It consists of a single domain composed predominantly of beta-strands. Two beta-sheets are twisted around a deep, long cleft, which is lined with many aromatic amino acid residues and is large enough to accommodate at least four xylose residues. The two conserved glutamate residues, Glu79 and Glu170, which are likely to be involved in catalysis, reach into this cleft from opposite sides. A niger xylanase I is of particular commercial interest because of its low pH optimum. A model is proposed which explains this low pH optimum compared to other members of xylanase family G.


    Related Citations: 
    • Crystallization and Preliminary Crystallographic Analysis of Endo-1,4-Beta-Xyalanase I from Aspergillus Niger
      Krengel, U.,Rozeboom, H.J.,Kalk, K.H.,Dijkstra, B.W.
      (1996) Acta Crystallogr.,Sect.D 52: 571


    Organizational Affiliation

    BIOSON Research Institute, University of Groningen, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDO-1,4-B-XYLANASE I
A, B, C, D
184Aspergillus nigerMutation(s): 0 
Gene Names: xynA
EC: 3.2.1.8
Find proteins for P55329 (Aspergillus niger)
Go to UniProtKB:  P55329
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 84.300α = 90.00
b = 85.300β = 90.00
c = 113.800γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
BRUTEphasing
XDSdata scaling
BRUTEmodel building
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-12-24
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance