Endoglucanase A from Clostridium thermocellum at atomic resolution

Experimental Data Snapshot

  • Resolution: 1.03 Å
  • R-Value Free: 0.149 
  • R-Value Work: 0.131 

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This is version 1.3 of the entry. See complete history


Advantages of high-resolution phasing: MAD to atomic resolution.

Schmidt, A.Gonzalez, A.Morris, R.J.Costabel, M.Alzari, P.M.Lamzin, V.S.

(2002) Acta Crystallogr D Biol Crystallogr 58: 1433-1441

  • DOI: https://doi.org/10.1107/S0907444902011368
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of the endoglucanase A from Clostridium thermocellum CelA was re-solved by three-wavelength MAD. Experimental phases were obtained in the resolution range 25-1.0 A. Various structure-solution approaches were tested in order to quantify the contribution of each wavelength. Two-wavelength MAD phasing was sufficient to obtain excellent experimental phases. SAD at the remote wavelength also resulted in interpretable maps. The three-wavelength MAD electron-density map was of excellent quality: for parts of the structure, atom types and bond types could be easily assigned. Double bonds in peptide links and side chains could be located owing to their increased electron density indicating their pi character. Comparison with a previously determined structure of CelA at 1.65 A showed that, apart from a few additional multiple conformers and differently oriented side chains, major differences occur at the protein-solvent interface. A complete additional solvent shell could be observed and the inner shells have been completed. The high accuracy of the structure allowed unambiguous assignment of the protonation state for the active-site catalytic carboxylates.

  • Organizational Affiliation

    EMBL Hamburg c/o DESY, Notkestrasse 85, Germany. andrea@embl-hamburg.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
endoglucanase A363Acetivibrio thermocellusMutation(s): 0 
Find proteins for A3DC29 (Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Explore A3DC29 
Go to UniProtKB:  A3DC29
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA3DC29
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HG

Download Ideal Coordinates CCD File 
B [auth A]
C [auth A]
D [auth A]
E [auth A]
F [auth A]
B [auth A],
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A]
Query on CL

Download Ideal Coordinates CCD File 
H [auth A]
I [auth A]
J [auth A]
K [auth A]
L [auth A]
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.03 Å
  • R-Value Free: 0.149 
  • R-Value Work: 0.131 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.441α = 90
b = 62.829β = 90
c = 103.891γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-09-04
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references, Derived calculations