Crystal structure of Legionella pneumophila effector AnkC

Experimental Data Snapshot

  • Resolution: 3.21 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 

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Ankyrin repeats as a dimerization module.

Kozlov, G.Wong, K.Wang, W.Skubak, P.Munoz-Escobar, J.Liu, Y.Siddiqui, N.Pannu, N.S.Gehring, K.

(2018) Biochem Biophys Res Commun 495: 1002-1007

  • DOI: https://doi.org/10.1016/j.bbrc.2017.11.135
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Legionella pneumophila is a pathogen, causing severe pneumonia in humans called Legionnaires' disease. AnkC (LegA12) is a poorly characterized 495-residue effector protein conserved in multiple Legionella species. Here, we report the crystal structure of a C-terminally truncated AnkC (2-384) at 3.2 Å resolution. The structure shows seven ankyrin repeats (ARs) with unique structural features. AnkC forms a dimer along the outer surface of loops between ARs. The dimer exists both in the crystal form and in solution, as shown by analytical ultracentrifugation. This is the first example of ARs as a dimerization module as opposed to solely a protein interaction domain. In addition, a novel α-helix insert between AR3-AR4 is positioned across the surface opposite the ankyrin groove. Sequence conservation suggests that the ankyrin groove of AnkC is a functional site that interacts with binding targets. This ankyrin domain structure is an important step towards a functional characterization of AnkC.

  • Organizational Affiliation

    Department of Biochemistry, Groupe de recherche axé sur la structure des protéines, McGill University, Montreal, QC H3G 0B1, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ankyrin repeat-containing protein407Legionella pneumophila subsp. pneumophila str. Philadelphia 1Mutation(s): 0 
Gene Names: legA12lpg0483
Find proteins for Q5ZY89 (Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513))
Explore Q5ZY89 
Go to UniProtKB:  Q5ZY89
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5ZY89
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.21 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.705α = 90
b = 78.705β = 90
c = 156.321γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaGSP-48370

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-29
    Type: Initial release
  • Version 1.1: 2017-12-13
    Changes: Database references
  • Version 1.2: 2017-12-27
    Changes: Database references
  • Version 1.3: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references