1K6A

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.14 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.109 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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

  • Primary Citation of Related Structures:  1GOK, 1GOM, 1GOO, 1GOQ, 1GOR

  • 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 ...

    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.


    Related Citations: 
    • Crystal Structure at 1.8A resolution and proposed amino acid sequence of a thermostable xylanase from Thermoascus aurantiacus
      Natesh, R.,Bhanumoorthy, P.,Vithayathil, P.J.,Sekar, K.,Ramakumar, S.,Viswamitra, M.A.
      (1999) J.Mol.Biol. 288: 999
    • High Resolution Structure and Sequence of T.aurantiacus Xylanase I: Implications for the Evolution of thermostability in Family 10 xylanases and enzymes with (beta)alpha-barrel architecture
      Lo Leggio, L.,Kalogiannis, S.,Bhat, M.K.,Pickersgill, R.W.
      (1999) Proteins 36: 295
    • Anisotropic refinement of the structure of Thermoascus aurantiacus xylanase I
      Teixeira, S.C.M.,Lo Leggio, L.,Pickersgill, R.,Cardin, C.
      (2001) Acta Crystallogr.,Sect.D 57: 385


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
xylanase I
A
303Thermoascus aurantiacusGene Names: XYNA
EC: 3.2.1.8
Find proteins for P23360 (Thermoascus aurantiacus)
Go to UniProtKB:  P23360
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.14 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.109 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 46.220α = 90.00
b = 59.240β = 109.80
c = 51.310γ = 90.00
Software Package:
Software NamePurpose
SHELXphasing
SCALEPACKdata scaling
SHELXL-97refinement
SHELXmodel building
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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