1AQ0

BARLEY 1,3-1,4-BETA-GLUCANASE IN MONOCLINIC SPACE GROUP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.170 

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This is version 2.0 of the entry. See complete history


Literature

Crystal structure of barley 1,3-1,4-beta-glucanase at 2.0-A resolution and comparison with Bacillus 1,3-1,4-beta-glucanase.

Muller, J.J.Thomsen, K.K.Heinemann, U.

(1998) J Biol Chem 273: 3438-3446

  • DOI: 10.1074/jbc.273.6.3438
  • Primary Citation of Related Structures:  
    1AQ0

  • PubMed Abstract: 
  • Both plants and bacteria produce enzymes capable of degrading the mixed-linked beta-glucan of the endosperm cell walls of cereal grains. The enzymes share the specificity for beta-1,4 glycosyl bonds of O-3-substituted glucose units in linear polysaccharides and a similar cleavage mechanism but are unrelated in sequence and tertiary structure ...

    Both plants and bacteria produce enzymes capable of degrading the mixed-linked beta-glucan of the endosperm cell walls of cereal grains. The enzymes share the specificity for beta-1,4 glycosyl bonds of O-3-substituted glucose units in linear polysaccharides and a similar cleavage mechanism but are unrelated in sequence and tertiary structure. The three-dimensional structure of the 1,3-1, 4-beta-glucanase isoenzyme EII from barley was determined from monoclinic crystals at a resolution of 2.0 A. The protein is folded into a betaalpha8 barrel structure as has been shown previously (Varghese, J. N., Garrett, T. P. J., Colman, P. M., Chen, L., Hoj, P. B., and Fincher, G. B. (1994) Proc. Natl. Acad. Sci. U.S.A. 91, 2785-2789) by diffraction analysis at lower resolution of tetragonal crystals. It contains one N-glycosylation site which is described in detail with the sugar moieties attached to residue Asn190. The geometry and hydration of the barley 1,3-1,4-beta-glucanase is analyzed; a model beta-glucan fragment is placed into the binding site by molecular dynamics simulation, and the beta-glucan binding grooves of the plant and bacterial enzymes are compared. Their active sites are shown to have a small number of common features in generally dissimilar geometries that serve to explain both the identical substrate specificity and the observed differences in inhibitor binding.


    Related Citations: 
    • Analysis of Glycan Structures of Barley (1-3,1-4)-Beta-D Glucan 4-Glucanohydrolase Isoenzyme Eii
      Harthill, J.E., Thomsen, K.K.
      (1995) Plant Physiol Biochem 33: 9
    • Crystallization of Barley (1-3,1-4)-Beta-Glucanase, Isoenzyme II
      Keitel, T., Thomsen, K.K., Heinemann, U.
      (1993) J Mol Biol 232: 1003

    Organizational Affiliation

    Forschungsgruppe Kristallographie, Max-Delbrück-Centrum für Molekulare Medizin, Robert-Rössle-Strasse 10, D-13122 Berlin, Germany. jjm@mdc-berlin.de



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
1,3-1,4-BETA-GLUCANASEA, B306Hordeum 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
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseC, D2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download Ideal Coordinates CCD File 
E [auth A], F [auth B]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.58α = 90
b = 82.99β = 104.36
c = 77.56γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
MOSFLMdata reduction
Agrovatadata scaling
ROTAVATAdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-02-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description, Structure summary