1GHR

THE THREE-DIMENSIONAL STRUCTURES OF TWO PLANT BETA-GLUCAN ENDOHYDROLASES WITH DISTINCT SUBSTRATE SPECIFICITIES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Three-dimensional structures of two plant beta-glucan endohydrolases with distinct substrate specificities.

Varghese, J.N.Garrett, T.P.Colman, P.M.Chen, L.Hoj, P.B.Fincher, G.B.

(1994) Proc.Natl.Acad.Sci.USA 91: 2785-2789

  • Primary Citation of Related Structures:  1GHS
  • Also Cited By: 3UR7, 3UR8

  • PubMed Abstract: 
  • The three-dimensional structures of (1-->3)-beta-glucanase (EC 3.2.1.39) isoenzyme GII and (1-->3,1-->4)-beta-glucanase (EC 3.2.1.73) isoenzyme EII from barley have been determined by x-ray crystallography at 2.2- to 2.3-A resolution. The two classes ...

    The three-dimensional structures of (1-->3)-beta-glucanase (EC 3.2.1.39) isoenzyme GII and (1-->3,1-->4)-beta-glucanase (EC 3.2.1.73) isoenzyme EII from barley have been determined by x-ray crystallography at 2.2- to 2.3-A resolution. The two classes of polysaccharide endohydrolase differ in their substrate specificity and function. Thus, the (1-->3)-beta-glucanases, which are classified amongst the plant "pathogenesis-related proteins," can hydrolyze (1-->3)- and (1-->3,1-->6)-beta-glucans of fungal cell walls and may therefore contribute to plant defense strategies, while the (1-->3,1-->4)-beta-glucanases function in plant cell wall hydrolysis during mobilization of the endosperm in germinating grain or during the growth of vegetative tissues. Both enzymes are alpha/beta-barrel structures. The catalytic amino acid residues are located within deep grooves which extend across the enzymes and which probably bind the substrates. Because the polypeptide backbones of the two enzymes are structurally very similar, the differences in their substrate specificities, and hence their widely divergent functions, have been acquired primarily by amino acid substitutions within the groove.


    Related Citations: 
    • Evolution of Polysaccharide Hydrolase Substrate Specificity
      Chen, L.,Fincher, G.B.,Hoj, P.J.
      (1993) J.Biol.Chem. 268: 13318
    • Crystallization and Preliminary X-Ray Analysis of (1,3)-and (1,3;1,4)-Beta--D-Glucanases from Germinating Barley
      Chen, L.,Garrett, T.P.J.,Varghese, J.N.,Fincher, G.B.,Hoj, P.B.
      (1993) J.Mol.Biol. 234: 888


    Organizational Affiliation

    Biomolecular Research Institute, Parkville, Victoria, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
1,3-1,4-BETA-GLUCANASE
A
306Hordeum vulgareEC: 3.2.1.73
Find proteins for P12257 (Hordeum vulgare)
Go to UniProtKB:  P12257
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Work: 0.176 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 87.400α = 90.00
b = 87.400β = 90.00
c = 109.500γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORphasing
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-11-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance