2EEX

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.165 

Starting Model: experimental
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This is version 2.2 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: https://doi.org/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 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)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endoglucanase519Acetivibrio thermocellusMutation(s): 1 
Gene Names: Cel44A
EC: 3.2.1.4 (PDB Primary Data), 3.2.1.151 (PDB Primary Data)
UniProt
Find proteins for A3DD30 (Acetivibrio thermocellus (strain ATCC 27405 / DSM 1237 / JCM 9322 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Explore A3DD30 
Go to UniProtKB:  A3DD30
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA3DD30
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose
B
5N/A
Glycosylation Resources
GlyTouCan:  G91683DU
GlyCosmos:  G91683DU
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.944α = 90
b = 59.12β = 90
c = 171.113γ = 90
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

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
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2021-11-10
    Changes: Database references, Structure summary
  • Version 2.2: 2023-10-25
    Changes: Data collection, Refinement description