1GZJ

Structure of Thermoascus aurantiacus family 5 endoglucanase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.159 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The 1.62 A Structure of Thermoascus Aurantiacus Endoglucanase: Completing the Structural Picture of Subfamilies in Glycoside Hydrolase Family 5

Lo Leggio, L.Larsen, S.

(2002) FEBS Lett. 103: 523


  • PubMed Abstract: 
  • The crystal structure of Thermoascus aurantiacus endoglucanase (Cel5A), a family 5 glycoside hydrolase, has been determined to 1.62 A resolution by multiple isomorphous replacement with anomalous scattering. It is the first report of a structure in t ...

    The crystal structure of Thermoascus aurantiacus endoglucanase (Cel5A), a family 5 glycoside hydrolase, has been determined to 1.62 A resolution by multiple isomorphous replacement with anomalous scattering. It is the first report of a structure in the subfamily to which Cel5A belongs. Cel5A consists solely of a catalytic module with compact eight-fold beta/alpha barrel architecture. The length of the tryptophan-rich substrate binding groove suggests the presence of substrate binding subsites -4 to +3. Structural comparison shows that two glycines are completely conserved in the family, in addition to the two catalytic glutamates and six other conserved residues previously identified. Gly 44 in particular is part of a type IV C-terminal helix capping motif, whose disruption is likely to affect the position of an essential conserved arginine. One aromatic residue (Trp 170 in Cel5A), not conserved in term of sequence, is nonetheless spatially conserved in the substrate binding groove. Its role might be to force the bend that occurs in the polysaccharide chain on binding, thus favoring substrate distortion at subsite -1.


    Related Citations: 
    • Crystallization and Preliminaryx-Ray Analysis of the Major Endoglucanase from Thermoascus Aurantiacus
      Loleggio, L.,Parry, N.J.,Van Beeumen, J.,Claeyssens, M.,Bhat, M.W.,Pickersgill, R.W.
      (1997) Acta Crystallogr.,Sect.D 53: 599


    Organizational Affiliation

    Centre for Crystallographic Studies, Department of Chemistry, Chemical Institute, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen, Denmark. leila@ccs.ki.ku.dk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDO TYPE CELLULASE ENGI
A, B
304Thermoascus aurantiacusGene Names: eg1
Find proteins for Q8TG26 (Thermoascus aurantiacus)
Go to UniProtKB:  Q8TG26
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 76.510α = 90.00
b = 85.850β = 90.00
c = 89.640γ = 90.00
Software Package:
Software NamePurpose
Agrovatadata scaling
ARPphasing
SHARPphasing
DMphasing
ROTAVATAdata scaling
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-08-06
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance