5N72

Crystal structure of the Legionella effector WipA shorter construct


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.842 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the WipA protein reveals a novel tyrosine protein phosphatase effector from Legionella pneumophila.

Pinotsis, N.Waksman, G.

(2017) J. Biol. Chem. 292: 9240-9251

  • DOI: 10.1074/jbc.M117.781948
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Legionnaires' disease is a severe form of pneumonia caused by the bacterium Legionella pneumophila. L. pneumophila pathogenicity relies on secretion of more than 300 effector proteins by a type IVb secretion system. Among these Legionella effectors, ...

    Legionnaires' disease is a severe form of pneumonia caused by the bacterium Legionella pneumophila. L. pneumophila pathogenicity relies on secretion of more than 300 effector proteins by a type IVb secretion system. Among these Legionella effectors, WipA has been primarily studied because of its dependence on a chaperone complex, IcmSW, for translocation through the secretion system, but its role in pathogenicity has remained unknown. In this study, we present the crystal structure of a large fragment of WipA, WipA435. Surprisingly, this structure revealed a serine/threonine phosphatase fold that unexpectedly targets tyrosine-phosphorylated peptides. The structure also revealed a sequence insertion that folds into an α-helical hairpin, the tip of which adopts a canonical coiled-coil structure. The purified protein was a dimer whose dimer interface involves interactions between the coiled coil of one WipA molecule and the phosphatase domain of another. Given the ubiquity of protein-protein interaction mediated by interactions between coiled-coils, we hypothesize that WipA can thereby transition from a homodimeric state to a heterodimeric state in which the coiled-coil region of WipA is engaged in a protein-protein interaction with a tyrosine-phosphorylated host target. In conclusion, these findings help advance our understanding of the molecular mechanisms of an effector involved in Legionella virulence and may inform approaches to elucidate the function of other effectors.


    Organizational Affiliation

    From the Department of Biological Sciences, Institute of Structural and Molecular Biology, Birkbeck, Malet Street, WC1E 7HX London, United Kingdom and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
WipA
A
404Legionella pneumophilaMutation(s): 0 
Gene Names: wipA
Find proteins for Q5GA16 (Legionella pneumophila)
Go to UniProtKB:  Q5GA16
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.842 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.219 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 103.060α = 90.00
b = 57.480β = 91.15
c = 80.710γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
SHELXDEphasing
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
ERCUnited Kingdom321630

Revision History 

  • Version 1.0: 2017-04-19
    Type: Initial release
  • Version 1.1: 2017-06-14
    Type: Database references