1GHR

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 

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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 U S A 91: 2785-2789

  • DOI: 10.1073/pnas.91.7.2785
  • Primary Citation of Related Structures:  
    1GHS, 1GHR

  • 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 of polysaccharide endohydrolase differ in their substrate specificity and function ...

    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: 
    • 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
    • Evolution of Polysaccharide Hydrolase Substrate Specificity
      Chen, L., Fincher, G.B., Hoj, P.J.
      (1993) J Biol Chem 268: 13318

    Organizational Affiliation

    Biomolecular Research Institute, Parkville, Victoria, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
1,3-1,4-BETA-GLUCANASEA306Hordeum vulgareMutation(s): 0 
EC: 3.2.1.73
Find proteins for P12257 (Hordeum vulgare)
Explore P12257 
Go to UniProtKB:  P12257
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Work: 0.176 
  • R-Value Observed: 0.176 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.4α = 90
b = 87.4β = 90
c = 109.5γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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