1G1K

COHESIN MODULE FROM THE CELLULOSOME OF CLOSTRIDIUM CELLULOLYTICUM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.230 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of a cohesin module from Clostridium cellulolyticum: implications for dockerin recognition.

Spinelli, S.Fierobe, H.P.Belaich, A.Belaich, J.P.Henrissat, B.Cambillau, C.

(2000) J Mol Biol 304: 189-200

  • DOI: https://doi.org/10.1006/jmbi.2000.4191
  • Primary Citation of Related Structures:  
    1G1K

  • PubMed Abstract: 

    In the assembly of the Clostridium cellulolyticum cellulosome, the multiple cohesin modules of the scaffolding protein CipC serve as receptors for cellulolytic enzymes which bear a dockerin module. The X-ray structure of a type I C. cellulolyticum cohesin module (Cc-cohesin) has been solved using molecular replacement, and refined at 2.0 A resolution. Despite a rather low sequence identity of 32 %, this module has a fold close to those of the two Clostridium thermocellum cohesin (Ct-cohesin) modules whose 3D structures have been determined previously. Cc-cohesin forms a dimer in the crystal, as do the two Ct-cohesins. We show here that the dimer exists in solution and that addition of dockerin-containing proteins dissociates the dimer. This suggests that the dimerization interface and the cohesin/dockerin interface may overlap. The nature of the overall surface and of the dimer interface of Cc-cohesin differ notably from those of the Ct-cohesin modules, being much less polar, and this may explain the species specificity observed in the cohesin/dockerin interaction of C. cellulolyticum and C. thermocellum. We have produced a topology model of a C. cellulolyticum dockerin and of a Cc-cohesin/dockerin complex using homology modeling and available biochemical data. Our model suggests that a special residue pair, already identified in dockerin sequences, is located at the center of the cohesin surface putatively interacting with the dockerin.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SCAFFOLDING PROTEIN
A, B
143Ruminiclostridium cellulolyticumMutation(s): 0 
Gene Names: cipC
UniProt
Find proteins for Q45996 (Ruminiclostridium cellulolyticum)
Explore Q45996 
Go to UniProtKB:  Q45996
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ45996
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.230 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.5α = 90
b = 57.25β = 90
c = 105.72γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
MOSFLMdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-11-22
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance