3CXB

Crystal Structure of sifa and skip

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 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
  • Primary Citation of Related Structures:  
    3CXB

  • 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 of mammalian cell endosomes, similar to that induced by Salmonella infection ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein sifAA336Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: sifA, STM1224
UniProt
Find proteins for Q56061 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore Q56061 
Go to UniProtKB:  Q56061
Entity Groups  
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UniProt GroupQ56061
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Pleckstrin homology domain-containing family M member 2B112Homo sapiensMutation(s): 0 
Gene Names: PLEKHM2, KIAA0842, SKIP
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IWE5 (Homo sapiens)
Explore Q8IWE5 
Go to UniProtKB:  Q8IWE5
PHAROS:  Q8IWE5
GTEx:  ENSG00000116786 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IWE5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.258 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.69α = 90
b = 110.679β = 90
c = 45.533γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
SOLVEphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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