Crystal structure of ST2348, a hypothetical protein with CBS domains from Sulfolobus tokodaii strain7

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 

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Crystal structure of ST2348, a CBS domain protein, from hyperthermophilic archaeon Sulfolobus tokodaii

Ragunathan, P.Kumarevel, T.Agari, Y.Shinkai, A.Kuramitsu, S.Yokoyama, S.Ponnuraj, K.

(2008) Biochem Biophys Res Commun 375: 124-128

  • DOI: https://doi.org/10.1016/j.bbrc.2008.07.140
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of a hypothetical protein ST2348 (GI: 47118305) from the hyperthermophilic bacteria Sulfolobus tokodaii has been determined using X-ray crystallography. The protein consists of two CBS (cystathione beta synthase) domains, whose function has been analyzed and reported here. PSI-BLAST shows a conservation of this domain in about 100 proteins in various species. However, none of the close homologs of ST2348 have been functionally characterized so far. Structure and sequence comparison of ST2348 with human AMP-kinase gamma1 subunit and the CBS domain pair of bacterial IMP dehydrogenase is suggestive of its binding to AMP and ATP. A highly conserved residue Asp118, located in a negatively charged patch near the ligand binding cleft, could serve as a site for phosphorylation similar to that found in the chemotatic signal protein CheY and thereby ST2348 can function as a signal transduction molecule.

  • Organizational Affiliation

    Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hypothetical protein ST2348
A, B
133Sulfurisphaera tokodaii str. 7Mutation(s): 0 
Find proteins for Q96Y20 (Sulfurisphaera tokodaii (strain DSM 16993 / JCM 10545 / NBRC 100140 / 7))
Explore Q96Y20 
Go to UniProtKB:  Q96Y20
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96Y20
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.42α = 90
b = 135.272β = 90
c = 41.234γ = 90
Software Package:
Software NamePurpose
BSSdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-08-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Derived calculations, Version format compliance