4U5I

Complex structure of mutant CtCel5E (E314A) with xylobiose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1074/jbc.M114.604454
  • Primary Citation of Related Structures:  

  • 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-1 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Endoglucanase H
A, B
403Clostridium thermocellum (strain ATCC 27405 / DSM 1237 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372)Mutation(s): 1 
Gene Names: celH
EC: 3.2.1.4
Find proteins for P16218 (Clostridium thermocellum (strain ATCC 27405 / DSM 1237 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Go to UniProtKB:  P16218
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BXP
Query on BXP

Download SDF File 
Download CCD File 
A, B
4-O-beta-D-xylopyranosyl-beta-D-xylopyranose
XYLOBIOSE
C10 H18 O9
LGQKSQQRKHFMLI-SJYYZXOBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.205 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 75.018α = 90.00
b = 75.018β = 90.00
c = 256.179γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-02-18
    Type: Database references
  • Version 1.2: 2015-03-11
    Type: Database references