Catalytic domain of Clostridium thermocellum CelT

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.182 

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This is version 1.2 of the entry. See complete history


Structure of the Catalytic Domain of the Clostridium Thermocellum Cellulase Celt

Kesavulu, M.M.Tsai, J.-Y.Lee, H.-L.Liang, P.-H.Hsiao, C.-D.

(2012) Acta Crystallogr D Biol Crystallogr 68: 310

  • DOI: https://doi.org/10.1107/S0907444912001990
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cellulases hydrolyze cellulose, a major component of plant cell walls, to oligosaccharides and monosaccharides. Several Clostridium species secrete multi-enzyme complexes (cellulosomes) containing cellulases. C. thermocellum CelT, a family 9 cellulase, lacks the accessory module(s) necessary for activity, unlike most other family 9 cellulases. Therefore, characterization of the CelT structure is essential in order to understand its catalytic mechanism. Here, the crystal structure of free CelTΔdoc, the catalytic domain of CelT, is reported at 2.1 Å resolution. Its structure differs in several aspects from those of other family 9 cellulases. CelTΔdoc contains an additional α-helix, α-helices of increased length and two additional surface-exposed β-strands. It also contains three calcium ions instead of one as found in C. cellulolyticum Cel9M. CelTΔdoc also has two flexible loops at the open end of its active-site cleft. Movement of these loops probably allows the substrate to access the active site. CelT is stable over a wide range of pH and temperature conditions, suggesting that CelT could be used to convert cellulose biomass into biofuel.

  • Organizational Affiliation

    Institute of Molecular Biology, Academia Sinica, Taipei 115, Taiwan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ENDOGLUCANASE611Acetivibrio thermocellusMutation(s): 0 
Find proteins for A3DJ82 (Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Explore A3DJ82 
Go to UniProtKB:  A3DJ82
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA3DJ82
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.182 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.86α = 90
b = 96.86β = 90
c = 159.92γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-29
    Type: Initial release
  • Version 1.1: 2012-03-28
    Changes: Other
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description