Crystal structure of phosphate transport system protein phoU from Aquifex aeolicus

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.216 

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Crystal structure of the "PhoU-like" phosphate uptake regulator from Aquifex aeolicus.

Oganesyan, V.Oganesyan, N.Adams, P.D.Jancarik, J.Yokota, H.A.Kim, R.Kim, S.H.

(2005) J Bacteriol 187: 4238-4244

  • DOI: https://doi.org/10.1128/JB.187.12.4238-4244.2005
  • Primary Citation of Related Structures:  
    1T72, 1T8B

  • PubMed Abstract: 

    The phoU gene of Aquifex aeolicus encodes a protein called PHOU_AQUAE with sequence similarity to the PhoU protein of Escherichia coli. Despite the fact that there is a large number of family members (more than 300) attributed to almost all known bacteria and despite PHOU_AQUAE's association with the regulation of genes for phosphate metabolism, the nature of its regulatory function is not well understood. Nearly one-half of these PhoU-like proteins, including both PHOU_AQUAE and the one from E. coli, form a subfamily with an apparent dimer structure of two PhoU domains on the basis of their amino acid sequence. The crystal structure of PHOU_AQUAE (a 221-amino-acid protein) reveals two similar coiled-coil PhoU domains, each forming a three-helix bundle. The structures of PHOU_AQUAE proteins from both a soluble fraction and refolded inclusion bodies (at resolutions of 2.8 and 3.2A, respectively) showed no significant differences. The folds of the PhoU domain and Bag domains (for a class of cofactors of the eukaryotic chaperone Hsp70 family) are similar. Accordingly, we propose that gene regulation by PhoU may occur by association of PHOU_AQUAE with the ATPase domain of the histidine kinase PhoR, promoting release of its substrate PhoB. Other proteins that share the PhoU domain fold include the coiled-coil domains of the STAT protein, the ribosome-recycling factor, and structural proteins like spectrin.

  • Organizational Affiliation

    Berkely Structural Genomics Center, Physical Biosciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, California 94720, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphate transport system protein phoU homolog227Aquifex aeolicusMutation(s): 10 
Gene Names: PHOUAQ_906
Find proteins for O67053 (Aquifex aeolicus (strain VF5))
Explore O67053 
Go to UniProtKB:  O67053
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67053
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
C [auth D]
D [auth E]
E [auth F]
C [auth D],
D [auth E],
E [auth F],
F [auth G]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.216 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.5α = 90
b = 113.5β = 90
c = 155γ = 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: 2004-12-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance