Structures of Clostridium thermocellum CbhA fibronectin(III)-like modules

Experimental Data Snapshot

  • Resolution: 1.69 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

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Structure and function of the Clostridium thermocellum cellobiohydrolase A X1-module repeat: enhancement through stabilization of the CbhA complex.

Brunecky, R.Alahuhta, M.Bomble, Y.J.Xu, Q.Baker, J.O.Ding, S.Y.Himmel, M.E.Lunin, V.V.

(2012) Acta Crystallogr D Biol Crystallogr 68: 292-299

  • DOI: https://doi.org/10.1107/S0907444912001680
  • Primary Citation of Related Structures:  
    3PDD, 3PDG, 3PE9

  • PubMed Abstract: 

    The efficient deconstruction of lignocellulosic biomass remains a significant barrier to the commercialization of biofuels. Whereas most commercial plant cell-wall-degrading enzyme preparations used today are derived from fungi, the cellulosomal enzyme system from Clostridium thermocellum is an equally effective catalyst, yet of considerably different structure. A key difference between fungal enzyme systems and cellulosomal enzyme systems is that cellulosomal enzyme systems utilize self-assembled scaffolded multimodule enzymes to deconstruct biomass. Here, the possible function of the X1 modules in the complex multimodular enzyme system cellobiohydrolase A (CbhA) from C. thermocellum is explored. The crystal structures of the two X1 modules from C. thermocellum CbhA have been solved individually and together as one construct. The role that calcium may play in the stability of the X1 modules has also been investigated, as well as the possibility that they interact with each other. Furthermore, the results show that whereas the X1 modules do not seem to act as cellulose disruptors, they do aid in the thermostability of the CbhA complex, effectively allowing it to deconstruct cellulose at a higher temperature.

  • Organizational Affiliation

    Biosciences Center, National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fibronectin(III)-like module
A, B, C, D
98Acetivibrio thermocellusMutation(s): 0 
Gene Names: Cthe_0413
Find proteins for A3DCH2 (Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Explore A3DCH2 
Go to UniProtKB:  A3DCH2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA3DCH2
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IOD

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth B]
H [auth B]
I [auth B]
E [auth A],
F [auth A],
G [auth B],
H [auth B],
I [auth B],
J [auth C],
K [auth C],
L [auth D],
M [auth D],
N [auth D],
O [auth D]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.69 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.128α = 90
b = 103.281β = 106.53
c = 45.632γ = 90
Software Package:
Software NamePurpose
PROTEUM PLUSdata collection
SHELXmodel building
SAINTdata reduction
PROTEUM PLUSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-23
    Type: Initial release
  • Version 1.1: 2012-05-09
    Changes: Database references
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations