6SY9

Structure of the Legionella pneumophila response regulator LqsR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The structure of the Legionella response regulator LqsR reveals amino acids critical for phosphorylation and dimerization.

Hochstrasser, R.Hutter, C.A.J.Arnold, F.M.Barlocher, K.Seeger, M.A.Hilbi, H.

(2020) Mol Microbiol 113: 1070-1084

  • DOI: https://doi.org/10.1111/mmi.14477
  • Primary Citation of Related Structures:  
    6SY9

  • PubMed Abstract: 

    The water-borne bacterium Legionella pneumophila replicates in environmental protozoa and upon inhalation destroys alveolar macrophages, thus causing a potentially fatal pneumonia termed 'Legionnaires' disease'. L. pneumophila employs the Legionella quorum sensing (Lqs) system to control its life cycle, pathogen-host cell interactions, motility and natural competence. Signaling through the Lqs system occurs through the α-hydroxyketone compound Legionella autoinducer-1 (LAI-1) and converges on the prototypic response regulator LqsR, which dimerizes upon phosphorylation of the conserved aspartate, D 108 . In this study, we determine the high-resolution structure of monomeric LqsR. The structure reveals a receiver domain adopting a canonical (βα) 5 fold, which is connected through an additional sixth helix and an extended α5-helix to a novel output domain. The two domains delineate a mainly positively charged groove, and the output domain adopts a five-stranded antiparallel β-sheet fold similar to nucleotide-binding proteins. Structure-based mutagenesis identified amino acids critical for LqsR phosphorylation and dimerization. Upon phosphorylation, the LqsR D172A and LqsR D302N/E303Q mutant proteins dimerized even more readily than wild-type LqsR, and no evidence for semi-phosphorylated heterodimers was obtained. Taken together, the high-resolution structure of LqsR reveals functionally relevant amino acid residues implicated in signal transduction of the prototypic response regulator.


  • Organizational Affiliation

    Institute of Medical Microbiology, University of Zürich, Zürich, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Response regulator361Legionella pneumophilaMutation(s): 0 
Gene Names: C3926_14995C3927_13800D7214_05345ERS240541_01816ERS253249_00465NCTC12000_02932
UniProt
Find proteins for Q5ZRY9 (Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513))
Explore Q5ZRY9 
Go to UniProtKB:  Q5ZRY9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5ZRY9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.1α = 90
b = 67.84β = 90
c = 116.6γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
HKL2Mapphasing
Cootmodel building
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland31003A_153200, 31003A_175557, PP00P3_144823

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-05
    Type: Initial release
  • Version 1.1: 2020-02-19
    Changes: Database references
  • Version 1.2: 2020-07-01
    Changes: Database references
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references