1TA3

Crystal Structure of xylanase (GH10) in complex with inhibitor (XIP)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.133 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Dual Nature of the Wheat Xylanase Protein Inhibitor XIP-I: STRUCTURAL BASIS FOR THE INHIBITION OF FAMILY 10 AND FAMILY 11 XYLANASES.

Payan, F.Leone, P.Porciero, S.Furniss, C.Tahir, T.Williamson, G.Durand, A.Manzanares, P.Gilbert, H.J.Juge, N.Roussel, A.

(2004) J.Biol.Chem. 279: 36029-36037

  • DOI: 10.1074/jbc.M404225200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The xylanase inhibitor protein I (XIP-I) from wheat Triticum aestivum is the prototype of a novel class of cereal protein inhibitors that inhibit fungal xylanases belonging to glycoside hydrolase families 10 (GH10) and 11 (GH11). The crystal structur ...

    The xylanase inhibitor protein I (XIP-I) from wheat Triticum aestivum is the prototype of a novel class of cereal protein inhibitors that inhibit fungal xylanases belonging to glycoside hydrolase families 10 (GH10) and 11 (GH11). The crystal structures of XIP-I in complex with Aspergillus nidulans (GH10) and Penicillium funiculosum (GH11) xylanases have been solved at 1.7 and 2.5 A resolution, respectively. The inhibition strategy is novel because XIP-I possesses two independent enzyme-binding sites, allowing binding to two glycoside hydrolases that display a different fold. Inhibition of the GH11 xylanase is mediated by the insertion of an XIP-I Pi-shaped loop (Lalpha(4)beta(5)) into the enzyme active site, whereas residues in the helix alpha7 of XIP-I, pointing into the four central active site subsites, are mainly responsible for the reversible inactivation of GH10 xylanases. The XIP-I strategy for inhibition of xylanases involves substrate-mimetic contacts and interactions occluding the active site. The structural determinants of XIP-I specificity demonstrate that the inhibitor is able to interact with GH10 and GH11 xylanases of both fungal and bacterial origin. The biological role of the xylanase inhibitors is discussed in light of the present structural data.


    Organizational Affiliation

    Architecture et Fonction de Macromolécules Biologiques, UMR-6098, CNRS et Universités d'Aix-Marseille I et II, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
xylanase inhibitor protein I
A
274Triticum aestivumMutation(s): 0 
Gene Names: XIPI
Find proteins for Q8L5C6 (Triticum aestivum)
Go to UniProtKB:  Q8L5C6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Endo-1,4-beta-xylanase
B
303Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139)Mutation(s): 0 
Gene Names: xlnC
EC: 3.2.1.8
Find proteins for Q00177 (Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139))
Go to UniProtKB:  Q00177
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.133 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 46.730α = 90.00
b = 75.872β = 90.00
c = 159.654γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
DENZOdata reduction
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-07-20
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance