1GOW

BETA-GLYCOSIDASE FROM SULFOLOBUS SOLFATARICUS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the beta-glycosidase from the hyperthermophilic archeon Sulfolobus solfataricus: resilience as a key factor in thermostability.

Aguilar, C.F.Sanderson, I.Moracci, M.Ciaramella, M.Nucci, R.Rossi, M.Pearl, L.H.

(1997) J Mol Biol 271: 789-802

  • DOI: 10.1006/jmbi.1997.1215
  • Primary Citation of Related Structures:  
    1GOW

  • PubMed Abstract: 
  • Enzymes from hyperthermophilic organisms must operate at temperatures which rapidly denature proteins from mesophiles. The structural basis of this thermostability is still poorly understood. Towards a further understanding of hyperthermostability, w ...

    Enzymes from hyperthermophilic organisms must operate at temperatures which rapidly denature proteins from mesophiles. The structural basis of this thermostability is still poorly understood. Towards a further understanding of hyperthermostability, we have determined the crystal structure of the beta-glycosidase (clan GH-1A, family 1) from the hyperthermophilic archaeon Sulfolobus solfataricus at 2.6 A resolution. The enzyme is a tetramer with subunit molecular mass at 60 kDa, and crystallises with half of the tetramer in the asymmetric unit. The structure is a (betaalpha)8 barrel, but with substantial elaborations between the beta-strands and alpha-helices in each repeat. The active site occurs at the centre of the top face of the barrel and is connected to the surface by a radial channel which becomes a blind-ended tunnel in the tetramer, and probably acts as the binding site for extended oligosaccharide substrates. Analysis of the structure reveals two features which differ significantly from mesophile proteins; (1) an unusually large proportion of surface ion-pairs involved in networks that cross-link sequentially separate structures on the protein surface, and (2) an unusually large number of solvent molecules buried in hydrophilic cavities between sequentially separate structures in the protein core. These factors suggest a model for hyperthermostability via resilience rather than rigidity.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Analysis of the Beta-Galactosidase from the Extreme Thermophilic Archaebacterium Sulfolobus Solfataricus
      Pearl, L.H., Hemmings, A.M., Nucci, R., Rossi, M.
      (1993) J Mol Biol 229: 561

    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Univesity College London, Gower Street, London, WC1E 6BT, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-GLYCOSIDASEAB489Saccharolobus solfataricusMutation(s): 0 
EC: 3.2.1.23
Find proteins for P22498 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore P22498 
Go to UniProtKB:  P22498
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.219 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 169.4α = 90
b = 169.4β = 90
c = 98.2γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
MOSFLMdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-08-20
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance