1VGP

Crystal Structure of an Isozyme of Citrate Synthase from Sulfolbus tokodaii strain7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.217 

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This is version 1.5 of the entry. See complete history


Literature

Crystal Structures of Two Isozymes of Citrate Synthase from Sulfolobus tokodaii Strain 7.

Murakami, M.Kouyama, T.

(2016) Biochem Res Int 2016: 7560919-7560919

  • DOI: 10.1155/2016/7560919
  • Primary Citation of Related Structures:  
    1VGP, 1VGM

  • PubMed Abstract: 
  • Thermoacidophilic archaeon Sulfolobus tokodaii strain 7 has two citrate synthase genes (ST1805-CS and ST0587-CS) in the genome with 45% sequence identity. Because they exhibit similar optimal temperatures of catalytic activity and thermal inactivation profiles, we performed structural comparisons between these isozymes to elucidate adaptation mechanisms to high temperatures in thermophilic CSs ...

    Thermoacidophilic archaeon Sulfolobus tokodaii strain 7 has two citrate synthase genes (ST1805-CS and ST0587-CS) in the genome with 45% sequence identity. Because they exhibit similar optimal temperatures of catalytic activity and thermal inactivation profiles, we performed structural comparisons between these isozymes to elucidate adaptation mechanisms to high temperatures in thermophilic CSs. The crystal structures of ST1805-CS and ST0587-CS were determined at 2.0 Å and 2.7 Å resolutions, respectively. Structural comparison reveals that both of them are dimeric enzymes composed of two identical subunits, and these dimeric structures are quite similar to those of citrate synthases from archaea and eubacteria. ST0587-CS has, however, 55 ion pairs within whole dimer structure, while having only 36 in ST1805-CS. Although the number and distributions of ion pairs are distinct from each other, intersubunit ion pairs between two domains of each isozyme are identical especially in interterminal region. Because the location and number of ion pairs are in a trend with other CSs from thermophilic microorganisms, the factors responsible for thermal adaptation of ST-CS isozymes are characterized by ion pairs in interterminal region.


    Organizational Affiliation

    Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
373aa long hypothetical citrate synthaseA373Sulfurisphaera tokodaiiMutation(s): 0 
Gene Names: strain7
EC: 2.3.3.1 (PDB Primary Data), 4.1.3.7 (PDB Primary Data), 2.3.3.16 (UniProt)
Find proteins for Q974S5 (Sulfurisphaera tokodaii (strain DSM 16993 / JCM 10545 / NBRC 100140 / 7))
Explore Q974S5 
Go to UniProtKB:  Q974S5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.217 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.6α = 90
b = 121.6β = 90
c = 108.83γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-06-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model
  • Version 1.4: 2016-09-28
    Changes: Other
  • Version 1.5: 2018-04-11
    Changes: Data collection, Database references