3UR7

Higher-density crystal structure of potato endo-1,3-beta-glucanase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Two high-resolution structures of potato endo-1,3-beta-glucanase reveal subdomain flexibility with implications for substrate binding

Wojtkowiak, A.Witek, K.Hennig, J.Jaskolski, M.

(2012) Acta Crystallogr D Biol Crystallogr 68: 713-723

  • DOI: https://doi.org/10.1107/S090744491200995X
  • Primary Citation of Related Structures:  
    3UR7, 3UR8

  • PubMed Abstract: 

    Endo-1,3-β-glucanases are widely distributed among bacteria, fungi and higher plants. They are responsible for hydrolysis of the glycosidic bond in specific polysaccharides with tracts of unsubstituted β-1,3-linked glucosyl residues. The plant enzymes belong to glycoside hydrolase family 17 (GH17) and are also members of class 2 of pathogenesis-related (PR) proteins. X-ray diffraction data were collected to 1.40 and 1.26 Å resolution from two crystals of endo-1,3-β-glucanase from Solanum tuberosum (potato, cultivar Désirée) which, despite having a similar packing framework, represented two separate crystal forms. In particular, they differed in the Matthews coefficient and are consequently referred to as higher density (HD; 1.40 Å resolution) and lower density (LD; 1.26 Å resolution) forms. The general fold of the protein resembles that of other known plant endo-1,3-β-glucanases and is defined by a (β/α)(8)-barrel with an additional subdomain built around the C-terminal half of the barrel. The structures revealed high flexibility of the subdomain, which forms part of the catalytic cleft. Comparison with structures of other GH17 endo-1,3-β-glucanases revealed differences in the arrangement of the secondary-structure elements in this region, which can be correlated with sequence variability and may suggest distinct substrate-binding patterns. The crystal structures revealed an unusual packing mode, clearly visible in the LD structure, caused by the presence of the C-terminal His(6) tag, which extends from the compact fold of the enzyme molecule and docks in the catalytic cleft of a neighbouring molecule. In this way, an infinite chain of His-tag-linked protein molecules is formed along the c direction.


  • Organizational Affiliation

    Department of Crystallography, Faculty of Chemistry, A. Mickiewicz University, Poznan, Poland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glucan endo-1,3-beta-D-glucosidase
A, B
323Solanum tuberosumMutation(s): 0 
Gene Names: gluB20-2
EC: 3.2.1.39
UniProt
Find proteins for Q70C53 (Solanum tuberosum)
Explore Q70C53 
Go to UniProtKB:  Q70C53
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ70C53
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download Ideal Coordinates CCD File 
C [auth B]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.162 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.128α = 90
b = 49.133β = 102.4
c = 80.504γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
MOLREPphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-30
    Type: Initial release
  • Version 1.1: 2013-01-23
    Changes: Database references
  • Version 1.2: 2018-03-07
    Changes: Data collection
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description