Structural studies on the mobility in the active site of the Thermoascus aurantiacus xylanase I

Experimental Data Snapshot

  • Resolution: 1.14 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.109 
  • R-Value Observed: 0.106 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Substrate specificity and subsite mobility in T. aurantiacus xylanase 10A.

Lo Leggio, L.Kalogiannis, S.Eckert, K.Teixeira, S.C.Bhat, M.K.Andrei, C.Pickersgill, R.W.Larsen, S.

(2001) FEBS Lett 509: 303-308

  • DOI: https://doi.org/10.1016/s0014-5793(01)03177-5
  • Primary Citation of Related Structures:  
    1GOK, 1GOM, 1GOO, 1GOQ, 1GOR, 1K6A

  • PubMed Abstract: 

    The substrate specificity of Thermoascus aurantiacus xylanase 10A (TAX) has been investigated both biochemically and structurally. High resolution crystallographic analyses at 291 K and 100 K of TAX complexes with xylobiose show that the ligand is in its alpha anomeric conformation and provide a rationale for specificity on p-nitrophenyl glycosides at the -1 and -2 subsites. Trp 275, which is disordered in uncomplexed structures, is stabilised by its interaction with xylobiose. Two structural subsets in family 10 are identified, which differ by the presence or absence of a short helical stretch in the eighth betaalpha-loop of the TIM barrel, the loop bearing Trp 275. This structural difference is discussed in the context of Trp 275 mobility and xylanase function.

  • Organizational Affiliation

    Centre for Crystallographic Studies, Chemical Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark. leila@ccs.ki.ku.dk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
xylanase I303Thermoascus aurantiacusMutation(s): 0 
Find proteins for P23360 (Thermoascus aurantiacus)
Explore P23360 
Go to UniProtKB:  P23360
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23360
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.14 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.109 
  • R-Value Observed: 0.106 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.22α = 90
b = 59.24β = 109.8
c = 51.31γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHELXmodel building

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-07-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance