4UEY

Structure of the periplasmic domain PhoQ double mutant (W104C-A128C)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Acidic pH and divalent cation sensing by PhoQ are dispensable for systemic salmonellae virulence.

Hicks, K.G.Delbecq, S.P.Sancho-Vaello, E.Blanc, M.P.Dove, K.K.Prost, L.R.Daley, M.E.Zeth, K.Klevit, R.E.Miller, S.I.

(2015) Elife 4: e06792-e06792

  • DOI: 10.7554/eLife.06792
  • Primary Citation of Related Structures:  
    4UEY

  • PubMed Abstract: 
  • Salmonella PhoQ is a histidine kinase with a periplasmic sensor domain (PD) that promotes virulence by detecting the macrophage phagosome. PhoQ activity is repressed by divalent cations and induced in environments of acidic pH, limited divalent catio ...

    Salmonella PhoQ is a histidine kinase with a periplasmic sensor domain (PD) that promotes virulence by detecting the macrophage phagosome. PhoQ activity is repressed by divalent cations and induced in environments of acidic pH, limited divalent cations, and cationic antimicrobial peptides (CAMP). Previously, it was unclear which signals are sensed by salmonellae to promote PhoQ-mediated virulence. We defined conformational changes produced in the PhoQ PD on exposure to acidic pH that indicate structural flexibility is induced in α-helices 4 and 5, suggesting this region contributes to pH sensing. Therefore, we engineered a disulfide bond between W104C and A128C in the PhoQ PD that restrains conformational flexibility in α-helices 4 and 5. PhoQ(W104C-A128C) is responsive to CAMP, but is inhibited for activation by acidic pH and divalent cation limitation. phoQ(W104C-A128C) Salmonella enterica Typhimurium is virulent in mice, indicating that acidic pH and divalent cation sensing by PhoQ are dispensable for virulence.


    Organizational Affiliation

    Department of Microbiology, University of Washington Medical School, Seattle, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PHOQ PERIPLASMIC DOMAIN DOUBLE MUTANTABC153Salmonella entericaMutation(s): 2 
EC: 2.7.13.3 (UniProt), 3.1.3 (UniProt)
Find proteins for P0DM80 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0DM80 
Go to UniProtKB:  P0DM80
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.035α = 90
b = 45.371β = 102.53
c = 81.374γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-06-24
    Type: Initial release
  • Version 1.1: 2018-04-25
    Changes: Data collection, Database references
  • Version 1.2: 2018-05-09
    Changes: Data collection, Database references