1Q5Z

Crystal Structure of the C-terminal Actin Binding Domain of Salmonella Invasion Protein A (SipA)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Salmonella SipA polymerizes actin by stapling filaments with nonglobular protein arms.

Lilic, M.Galkin, V.E.Orlova, A.VanLoock, M.S.Egelman, E.H.Stebbins, C.E.

(2003) Science 301: 1918-1921

  • DOI: 10.1126/science.1088433
  • Primary Citation of Related Structures:  
    1Q5Z

  • PubMed Abstract: 
  • Like many bacterial pathogens, Salmonella spp. use a type III secretion system to inject virulence proteins into host cells. The Salmonella invasion protein A (SipA) binds host actin, enhances its polymerization near adherent extracellular bacteria, ...

    Like many bacterial pathogens, Salmonella spp. use a type III secretion system to inject virulence proteins into host cells. The Salmonella invasion protein A (SipA) binds host actin, enhances its polymerization near adherent extracellular bacteria, and contributes to cytoskeletal rearrangements that internalize the pathogen. By combining x-ray crystallography of SipA with electron microscopy and image analysis of SipA-actin filaments, we show that SipA functions as a "molecular staple," in which a globular domain and two nonglobular "arms" mechanically stabilize the filament by tethering actin subunits in opposing strands. Deletion analysis of the tethering arms provides strong support for this model.


    Organizational Affiliation

    Laboratory of Structural Microbiology, Rockefeller University, New York, NY 10021, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SipAA177Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: sipA
Find proteins for P0CL52 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0CL52 
Go to UniProtKB:  P0CL52
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.9α = 90
b = 79.9β = 90
c = 57.5γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing
RESOLVEmodel building
CNSrefinement
RESOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-10-07
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance