1QVB

CRYSTAL STRUCTURE OF THE BETA-GLYCOSIDASE FROM THE HYPERTHERMOPHILE THERMOSPHAERA AGGREGANS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.217 

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This is version 1.3 of the entry. See complete history. 


Literature

Crystal structure of the beta-glycosidase from the hyperthermophile Thermosphaera aggregans: insights into its activity and thermostability.

Chi, Y.I., Martinez-Cruz, L.A., Jancarik, J., Swanson, R.V., Robertson, D.E., Kim, S.H.

(1999) FEBS Lett 445: 375-383

  • DOI: 10.1016/s0014-5793(99)00090-3
  • Primary Citation of Related Structures:  
    1QVB

  • PubMed Abstract: 

    • The glycosyl hydrolases are an important group of enzymes that are responsible for cleaving a range of biologically significant carbohydrate compounds. Structural information on these enzymes has provided useful information on their molecular basis for the functional variations, while the characterization of the structural features that account for the high thermostability of proteins is of great scientific and biotechnological interest ...

    The glycosyl hydrolases are an important group of enzymes that are responsible for cleaving a range of biologically significant carbohydrate compounds. Structural information on these enzymes has provided useful information on their molecular basis for the functional variations, while the characterization of the structural features that account for the high thermostability of proteins is of great scientific and biotechnological interest. To these ends we have determined the crystal structure of the beta-glycosidase from a hyperthermophilic archeon Thermosphaera aggregans. The structure is a (beta/alpha)8 barrel (TIM-barrel), as seen in other glycosyl hydrolase family 1 members, and forms a tetramer. Inspection of the active site and the surrounding area reveals two catalytic glutamate residues consistent with the retaining mechanism and the surrounding polar and aromatic residues consistent with a monosaccharide binding site. Comparison of this structure with its mesophilic counterparts implicates a variety of structural features that could contribute to the thermostability. These include an increased number of surface ion pairs, an increased number of internal water molecules and a decreased surface area upon forming an oligomeric quaternary structure.

    Organizational Affiliation: 

    Department of Chemistry and Lawrence Berkeley National Laboratory, University of California, Berkeley 94720, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-GLYCOSIDASE A, B481Thermosphaera aggregansMutation(s): 0 
Find proteins for Q9YGA8 (Thermosphaera aggregans)
Explore Q9YGA8 
Go to UniProtKB:  Q9YGA8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.217 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.509α = 90
b = 102.215β = 90
c = 95.776γ = 90
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-07-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-04
    Changes: Data collection