4KUN

Crystal structure of Legionella pneumophila Lpp1115 / KaiB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The Legionella pneumophila kai operon is implicated in stress response and confers fitness in competitive environments.

Loza-Correa, M.Sahr, T.Rolando, M.Daniels, C.Petit, P.Skarina, T.Gomez Valero, L.Dervins-Ravault, D.Honore, N.Savchenko, A.Buchrieser, C.

(2014) Environ Microbiol 16: 359-381

  • DOI: 10.1111/1462-2920.12223
  • Primary Citation of Related Structures:  
    4KUN

  • PubMed Abstract: 
  • Legionella pneumophila uses aquatic protozoa as replication niche and protection from harsh environments. Although L. pneumophila is not known to have a circadian clock, it encodes homologues of the KaiBC proteins of Cyanobacteria that regulate circa ...

    Legionella pneumophila uses aquatic protozoa as replication niche and protection from harsh environments. Although L. pneumophila is not known to have a circadian clock, it encodes homologues of the KaiBC proteins of Cyanobacteria that regulate circadian gene expression. We show that L. pneumophila kaiB, kaiC and the downstream gene lpp1114, are transcribed as a unit under the control of the stress sigma factor RpoS. KaiC and KaiB of L. pneumophila do not interact as evidenced by yeast and bacterial two-hybrid analyses. Fusion of the C-terminal residues of cyanobacterial KaiB to Legionella KaiB restores their interaction. In contrast, KaiC of L. pneumophila conserved autophosphorylation activity, but KaiB does not trigger the dephosphorylation of KaiC like in Cyanobacteria. The crystal structure of L. pneumophila KaiB suggests that it is an oxidoreductase-like protein with a typical thioredoxin fold. Indeed, mutant analyses revealed that the kai operon-encoded proteins increase fitness of L. pneumophila in competitive environments, and confer higher resistance to oxidative and sodium stress. The phylogenetic analysis indicates that L. pneumophila KaiBC resemble Synechosystis KaiC2B2 and not circadian KaiB1C1. Thus, the L. pneumophila Kai proteins do not encode a circadian clock, but enhance stress resistance and adaption to changes in the environments.


    Organizational Affiliation

    Institut Pasteur, Biologie des Bactéries Intracellulaires, Paris, France; CNRS UMR 3525, Paris, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Hypothetical protein Lpp1115AB91Legionella pneumophila str. ParisMutation(s): 0 
Gene Names: lpp1115
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A,BL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.83α = 90
b = 46.05β = 105.56
c = 45.079γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
SOLVEphasing
PHENIXrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-05
    Type: Initial release
  • Version 1.1: 2013-06-12
    Changes: Structure summary
  • Version 1.2: 2013-10-23
    Changes: Database references, Structure summary
  • Version 1.3: 2014-10-08
    Changes: Database references