3CXB

Crystal Structure of sifa and skip


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.258 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and function of Salmonella SifA indicate that its interactions with SKIP, SseJ, and RhoA family GTPases induce endosomal tubulation

Ohlson, M.B.Huang, Z.Alto, N.M.Blanc, M.P.Dixon, J.E.Chai, J.Miller, S.I.

(2008) Cell Host Microbe 4: 434-446

  • DOI: 10.1016/j.chom.2008.08.012

  • PubMed Abstract: 
  • The Salmonella typhimurium type III secretion effector protein SifA is essential for inducing tubulation of the Salmonella phagosome and binds the mammalian kinesin-binding protein SKIP. Coexpression of SifA with the effector SseJ induced tubulation ...

    The Salmonella typhimurium type III secretion effector protein SifA is essential for inducing tubulation of the Salmonella phagosome and binds the mammalian kinesin-binding protein SKIP. Coexpression of SifA with the effector SseJ induced tubulation of mammalian cell endosomes, similar to that induced by Salmonella infection. Interestingly, GTP-bound RhoA, RhoB, and RhoC also induced endosomal tubulation when coexpressed with SseJ, indicating that SifA likely mimics or activates a RhoA family GTPase. The structure of SifA in complex with the PH domain of SKIP revealed that SifA has two distinct domains; the amino terminus binds SKIP, and the carboxyl terminus has a fold similar to SopE, a Salmonella effector with Rho GTPase guanine nucleotide exchange factor activity (GEF). Similar to GEFs, SifA interacted with GDP-bound RhoA, and purified SseJ and RhoA formed a protein complex, suggesting that SifA, SKIP, SseJ, and RhoA family GTPases cooperatively promote host membrane tubulation.


    Organizational Affiliation

    Department of Microbiology, University of Washington, Seattle, WA 98195, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein sifA
A
336Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: sifA
Find proteins for Q56061 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  Q56061
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Pleckstrin homology domain-containing family M member 2
B
112Homo sapiensMutation(s): 0 
Gene Names: PLEKHM2 (KIAA0842, SKIP)
Find proteins for Q8IWE5 (Homo sapiens)
Go to Gene View: PLEKHM2
Go to UniProtKB:  Q8IWE5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.258 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 91.690α = 90.00
b = 110.679β = 90.00
c = 45.533γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
HKL-2000data reduction
HKL-2000data scaling
CNSrefinement
MAR345dtbdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-04-24 
  • Released Date: 2008-12-02 
  • Deposition Author(s): Huang, Z., Chai, J.

Revision History 

  • Version 1.0: 2008-12-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance