4Q25

Crystal structure of PhoU from Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 

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Literature

Crystal structure of PhoU from Pseudomonas aeruginosa, a negative regulator of the Pho regulon.

Lee, S.J.Park, Y.S.Kim, S.J.Lee, B.J.Suh, S.W.

(2014) J Struct Biol 188: 22-29

  • DOI: 10.1016/j.jsb.2014.08.010
  • Primary Citation of Related Structures:  
    4Q25

  • PubMed Abstract: 
  • In Escherichia coli, seven genes (pstS, pstC, pstA, pstB, phoU, phoR, and phoB) are involved in sensing environmental phosphate (Pi) and controlling the expression of the Pho regulon. PhoU is a negative regulator of the Pi-signaling pathway and modulates Pi transport through Pi transporter proteins (PstS, PstC, PstA, and PstB) through the two-component system PhoR and PhoB ...

    In Escherichia coli, seven genes (pstS, pstC, pstA, pstB, phoU, phoR, and phoB) are involved in sensing environmental phosphate (Pi) and controlling the expression of the Pho regulon. PhoU is a negative regulator of the Pi-signaling pathway and modulates Pi transport through Pi transporter proteins (PstS, PstC, PstA, and PstB) through the two-component system PhoR and PhoB. Inactivation of PhoY2, one of the two PhoU homologs in Mycobacterium tuberculosis, causes defects in persistence phenotypes and increased susceptibility to antibiotics and stresses. Despite the important biological role, the mechanism of PhoU function is still unknown. Here we have determined the crystal structure of PhoU from Pseudomonas aeruginosa. It exists as a dimer in the crystal, with each monomer consisting of two structurally similar three-helix bundles. Our equilibrium sedimentation measurements support the reversible monomer-dimer equilibrium model in which P. aeruginosa PhoU exists in solution predominantly as dimers, with monomers in a minor fraction, at low protein concentrations. The dissociation constant for PhoU dimerization is 3.2×10(-6)M. The overall structure of P. aeruginosa PhoU dimer resembles those of Aquifex aeolicus PhoU and Thermotoga maritima PhoU2. However, it shows distinct structural features in some loops and the dimerization pattern.


    Organizational Affiliation

    Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-742, Republic of Korea; Department of Biophysics and Chemical Biology, College of Natural Sciences, Seoul National University, Seoul 151-742, Republic of Korea. Electronic address: sewonsuh@snu.ac.kr.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphate-specific transport system accessory protein PhoU homologA, B250Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA5365phoU
UniProt
Find proteins for Q51547 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q51547 
Go to UniProtKB:  Q51547
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ51547
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.483α = 90
b = 70.483β = 90
c = 196.203γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SOLVEphasing
REFMACrefinement
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: 2015-02-18
    Type: Initial release