4U3A

Crystal structure of CtCel5E


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.42 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Biochemical Characterization and Structural Analysis of a Bifunctional Cellulase/Xylanase from Clostridium thermocellum

Yuan, S.F.Wu, T.H.Lee, H.L.Hsieh, H.Y.Lin, W.L.Yang, B.Chang, C.K.Li, Q.Gao, J.Huang, C.H.Ho, M.C.Guo, R.T.Liang, P.H.

(2015) J Biol Chem 290: 5739-5748

  • DOI: https://doi.org/10.1074/jbc.M114.604454
  • Primary Citation of Related Structures:  
    4U3A, 4U5I, 4U5K

  • PubMed Abstract: 

    We expressed an active form of CtCel5E (a bifunctional cellulase/xylanase from Clostridium thermocellum), performed biochemical characterization, and determined its apo- and ligand-bound crystal structures. From the structures, Asn-93, His-168, His-169, Asn-208, Trp-347, and Asn-349 were shown to provide hydrogen-bonding/hydrophobic interactions with both ligands. Compared with the structures of TmCel5A, a bifunctional cellulase/mannanase homolog from Thermotoga maritima, a flexible loop region in CtCel5E is the key for discriminating substrates. Moreover, site-directed mutagenesis data confirmed that His-168 is essential for xylanase activity, and His-169 is more important for xylanase activity, whereas Asn-93, Asn-208, Tyr-270, Trp-347, and Asn-349 are critical for both activities. In contrast, F267A improves enzyme activities.


  • Organizational Affiliation

    the Institute of Biochemical Sciences, and.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endoglucanase H
A, B
403Acetivibrio thermocellus ATCC 27405Mutation(s): 0 
Gene Names: celHCthe_1472
EC: 3.2.1.4
UniProt
Find proteins for P16218 (Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Explore P16218 
Go to UniProtKB:  P16218
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16218
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.42 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.93α = 90
b = 74.93β = 90
c = 254.195γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-02-18
    Changes: Database references
  • Version 1.2: 2015-03-11
    Changes: Database references
  • Version 1.3: 2017-08-30
    Changes: Data collection, Database references, Derived calculations, Source and taxonomy
  • Version 1.4: 2017-10-04
    Changes: Data collection
  • Version 1.5: 2024-03-20
    Changes: Data collection, Database references