Structure of the Legionella pneumophila response regulator LqsR

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

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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:  

  • 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.

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
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • 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
XDSdata reduction
XSCALEdata scaling
Cootmodel building
PDB_EXTRACTdata extraction

Structure Validation

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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