1NLR

ENDO-1,4-BETA-GLUCANASE CELB2, CELLULASE, NATIVE STRUCTURE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Streptomyces lividans family 12 endoglucanase: construction of the catalytic cre, expression, and X-ray structure at 1.75 A resolution.

Sulzenbacher, G.Shareck, F.Morosoli, R.Dupont, C.Davies, G.J.

(1997) Biochemistry 36: 16032-16039

  • DOI: 10.1021/bi972407v

  • PubMed Abstract: 
  • Cellulases are the glycoside hydrolases responsible for the enzymatic breakdown of the structural plant polymer cellulose. Together with xylanases they counteract the lmitless accumulation of plant biomass in nature and are of considerable fundamenta ...

    Cellulases are the glycoside hydrolases responsible for the enzymatic breakdown of the structural plant polymer cellulose. Together with xylanases they counteract the lmitless accumulation of plant biomass in nature and are of considerable fundamental and biotechnological interest. Endoglucanase CelB from Streptomyces lividans performs hydrolysis of the beta-1,4-glycosidic bonds of cellulose, with net retention of anomeric configuration. The enzyme is a member of glycoside hydrolase family 12 [Henrissat, B., and Bairoch, A. (1996) Biochem. J. 316, 695-696], which had previously eluded detailed structural analysis. A truncated, but cataytically competent form of CelB, locking the flexible linker region and cellulose-binding domain, has been constructed and overexpressed in a S. lividans expression system. The three-dimensional X-ray structure of the resulting catalytic domain, CelB2, has been solved by conventional multiple isomorphous replacement methods and refined to an R factor of 0.187 at 1.75 A resolution. The overall fold of the enzyme shows a remarkable similarity to that of family 11 xylanases, as previously predicted by hydrophobic clustering analysis [Törrönen, A., Kubicek, C.P., and Henrissat, B. (1993) FEBS Lett. 321, 135-139]. The 23 kDa protein presents a jelly-roll topology, built up mainly by antiparallel beta-sheets arranged in a sandwich-like manner. A deep substrate-binding cleft runs across the surface, as has been observed in other endoglucanase structures, and is potentially able to accommodate up to five binding subsites. The likely catalytic nucleophile and Brønsted acid/base, residues Glu 120 and Glue 203, respectively, have their carboxylate groups separated by a distance of approximately 7.0 A and are located approximately 15 A from one end of the cleft, implying a -3 to +2 active site.


    Related Citations: 
    • Purification and Characterization of the Celb Endoglucanase from Streptomyces Lividans 66 and DNA Sequence of the Encoding Gene
      Wittmann, S.,Shareck, F.,Kluepfel, D.,Morosoli, R.
      (1994) Appl.Environ.Microbiol. 60: 1701
    • Erratum. Structure of the Inhibitory Receptor for Human Natural Killer Cells Resembles Haematopoietic Receptors
      Fan, Q.R.,Mosyak, L.,Winter, C.C.,Wagtmann, N.,Long, E.O.,Wiley, D.C.
      (1997) Nature 390: 315


    Organizational Affiliation

    Department of Chemistry, University of York, Heslington, York YO1 5DD, England, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDO-1,4-BETA-GLUCANASE
A
234Streptomyces lividansGene Names: celB
Find proteins for Q54331 (Streptomyces lividans)
Go to UniProtKB:  Q54331
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MHO
Query on MHO
A
L-PEPTIDE LINKINGC5 H11 N O3 SMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.187 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 48.492α = 90.00
b = 95.479β = 90.00
c = 40.519γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
MLPHAREphasing
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-11-25
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance