Crystal structure of Legionella pneumophila effector Ceg4 with N-terminal TEV protease cleavage sequence

Experimental Data Snapshot

  • Resolution: 1.88 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.159 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


TheLegionella pneumophilaeffector Ceg4 is a phosphotyrosine phosphatase that attenuates activation of eukaryotic MAPK pathways.

Quaile, A.T.Stogios, P.J.Egorova, O.Evdokimova, E.Valleau, D.Nocek, B.Kompella, P.S.Peisajovich, S.Yakunin, A.F.Ensminger, A.W.Savchenko, A.

(2018) J Biol Chem 293: 3307-3320

  • DOI: https://doi.org/10.1074/jbc.M117.812727
  • Primary Citation of Related Structures:  
    6AOJ, 6AOK

  • PubMed Abstract: 

    Host colonization by Gram-negative pathogens often involves delivery of bacterial proteins called "effectors" into the host cell. The pneumonia-causing pathogen Legionella pneumophila delivers more than 330 effectors into the host cell via its type IVB Dot/Icm secretion system. The collective functions of these proteins are the establishment of a replicative niche from which Legionella can recruit cellular materials to grow while evading lysosomal fusion inhibiting its growth. Using a combination of structural, biochemical, and in vivo approaches, we show that one of these translocated effector proteins, Ceg4, is a phosphotyrosine phosphatase harboring a haloacid dehalogenase-hydrolase domain. Ceg4 could dephosphorylate a broad range of phosphotyrosine-containing peptides in vitro and attenuated activation of MAPK-controlled pathways in both yeast and human cells. Our findings indicate that L. pneumophila 's infectious program includes manipulation of phosphorylation cascades in key host pathways. The structural and functional features of the Ceg4 effector unraveled here provide first insight into its function as a phosphotyrosine phosphatase, paving the way to further studies into L. pneumophila pathogenicity.

  • Organizational Affiliation

    From the Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S 3E5, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ceg4217Legionella pneumophila subsp. pneumophila str. Philadelphia 1Mutation(s): 0 
Gene Names: lpg0096
Find proteins for Q5ZZB5 (Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513))
Explore Q5ZZB5 
Go to UniProtKB:  Q5ZZB5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5ZZB5
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.88 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.035α = 90
b = 48.027β = 90
c = 100.102γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling
PHENIXmodel building
Cootmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-10
    Type: Initial release
  • Version 1.1: 2018-01-17
    Changes: Database references
  • Version 1.2: 2018-03-28
    Changes: Data collection, Database references