1OA7

Structure of Melanocarpus albomyces endoglucanase in complex with cellobiose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of a Family 45 Endoglucanase from Melanocarpus Albomyces: Mechanistic Implications Based on the Free and Cellobiose-Bound Forms

Hirvonen, M.Papageorgiou, A.C.

(2003) J.Mol.Biol. 329: 403

  • Primary Citation of Related Structures:  1OA9

  • PubMed Abstract: 
  • Cellulose, a polysaccharide of beta-1,4-linked D-glucosyl units, is the major component of plant cell walls and one of the most abundant biopolymers in nature. Cellulases (cellobiohydrolases and endoglucanases) are enzymes that catalyse the hydrolysi ...

    Cellulose, a polysaccharide of beta-1,4-linked D-glucosyl units, is the major component of plant cell walls and one of the most abundant biopolymers in nature. Cellulases (cellobiohydrolases and endoglucanases) are enzymes that catalyse the hydrolysis of cellulose to smaller oligosaccharides, a process of paramount importance in biotechnology. The thermophilic fungus Melanocarpus albomyces produces a 20 kDa endoglucanase known as 20K-cellulase that has been found particularly useful in the textile industry. The crystal structures of free 20K-cellulase and its complex with cellobiose have been determined at 2.0 A resolution. The enzyme, classified into the glycoside hydrolase family 45, exhibits the characteristic six-stranded beta-barrel found before in Humicola insolens endoglucanase V structure. However, the active site in the 20K-cellulase shows a closing of approximately 2.5-3.5A while a mobile loop identified previously in Humicola insolens endoglucanase V and implicated in the catalytic mechanism is well-defined in 20K-cellulase. In addition, the crystal structure of the cellobiose complex shows a shift in the cellobiose position at the substrate-binding cleft. It is therefore proposed that these alterations may reflect differences in the binding mechanism and catalytic action of the enzyme.


    Organizational Affiliation

    Turku Centre for Biotechnology, University of Turku, P.O. Box 123, Turku 20521, Finland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CELLULASE
A
214Melanocarpus albomycesGene Names: cel45A
EC: 3.2.1.4
Find proteins for Q8J0K8 (Melanocarpus albomyces)
Go to UniProtKB:  Q8J0K8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CBI
Query on CBI

Download SDF File 
Download CCD File 
A
CELLOBIOSE
C12 H22 O11
GUBGYTABKSRVRQ-QRZGKKJRSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.191 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 47.300α = 90.00
b = 47.300β = 90.00
c = 178.200γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-29
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance