2E4T

Crystal structure of Cel44A, GH family 44 endoglucanase from Clostridium thermocellum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.96 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.133 
  • R-Value Observed: 0.133 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of Cel44A, a glycoside hydrolase family 44 endoglucanase from Clostridium thermocellum.

Kitago, Y.Karita, S.Watanabe, N.Kamiya, M.Aizawa, T.Sakka, K.Tanaka, I.

(2007) J Biol Chem 282: 35703-35711

  • DOI: 10.1074/jbc.M706835200
  • Primary Citation of Related Structures:  
    2E0P, 2E4T, 2EEX, 2EJ1, 2EO7, 2EQD

  • PubMed Abstract: 
  • The crystal structure of Cel44A, which is one of the enzymatic components of the cellulosome of Clostridium thermocellum, was solved at a resolution of 0.96 A. This enzyme belongs to glycoside hydrolase family (GH family) 44. The structure reveals that Cel44A consists of a TIM-like barrel domain and a beta-sandwich domain ...

    The crystal structure of Cel44A, which is one of the enzymatic components of the cellulosome of Clostridium thermocellum, was solved at a resolution of 0.96 A. This enzyme belongs to glycoside hydrolase family (GH family) 44. The structure reveals that Cel44A consists of a TIM-like barrel domain and a beta-sandwich domain. The wild-type and the E186Q mutant structures complexed with substrates suggest that two glutamic acid residues, Glu(186) and Glu(359), are the active residues of the enzyme. Biochemical experiments were performed to confirm this idea. The structural features indicate that GH family 44 belongs to clan GH-A and that the reaction catalyzed by Cel44A is retaining type hydrolysis. The stereochemical course of hydrolysis was confirmed by a (1)H NMR experiment using the reduced cellooligosaccharide as a substrate.


    Organizational Affiliation

    Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 0600810, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
EndoglucanaseA519Acetivibrio thermocellusMutation(s): 0 
Gene Names: celJ
EC: 3.2.1.4 (PDB Primary Data), 3.2.1.151 (PDB Primary Data)
UniProt
Find proteins for P71140 (Acetivibrio thermocellus)
Explore P71140 
Go to UniProtKB:  P71140
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.96 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.133 
  • R-Value Observed: 0.133 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.077α = 90
b = 59.155β = 90
c = 170.684γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PFdata collection
DENZOdata reduction
SCALEPACKdata scaling
SHELXEmodel building

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-09-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance