Crystal structure of Phosphoribosyl anthranilate isomerase from Thermus Thermophilus

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.264 

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Stabilization due to dimer formation of phosphoribosyl anthranilate isomerase from Thermus thermophilus HB8: X-ray Analysis and DSC experiments.

Taka, J.Ogasahara, K.Jeyakanthan, J.Kunishima, N.Kuroishi, C.Sugahara, M.Yokoyama, S.Yutani, K.

(2005) J Biochem 137: 569-578

  • DOI: https://doi.org/10.1093/jb/mvi075
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The crystal structure of phosphoribosyl anthranilate isomerase (PRAI) from Thermus thermophilus HB8 (TtPRAI) was solved at 2.0 A resolution. The overall structure of TtPRAI with a dimeric structure was quite similar to that of PRAI from Thermotoga maritima (TmPRAI). In order to elucidate the stabilization mechanism of TtPRAI, its physicochemical properties were examined using DSC, CD, and analytical centrifugation at various pHs in relation to the association-dissociation of the subunits. Based on the experimental results for TtPRAI and the structural information on TtPRAI and TmPRAI, we found that: (i) the denaturation of TtPRAI at acidic pH is correlated with the dissociation of its dimeric form; (ii) the hydrophobic interaction of TtPRAI in the monomer structure is slightly greater than that of TmPRAI, but dimer interface of the TmPRAI is remarkably greater; (iii) the contributions of hydrogen bonds and ion bonds to the stability are similar to each other; and (iv) destabilization due to the presence of cavities in TtPRAI is greater than that of TmPRAI in both the monomer and dimer structures.

  • Organizational Affiliation

    RIKEN Harima Institute at SPring8, 1-1-1 Kohto, Mikazukicho, Sayo, Hyogo 679-5148.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphoribosylanthranilate isomerase
A, B
203Thermus thermophilusMutation(s): 0 
Find proteins for P83825 (Thermus thermophilus)
Explore P83825 
Go to UniProtKB:  P83825
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP83825
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.264 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 144.205α = 90
b = 144.205β = 90
c = 144.205γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-23
    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: 2023-10-25
    Changes: Data collection, Database references, Refinement description