2YN5

Structural insight into the giant calcium-binding adhesin SiiE: implications for the adhesion of Salmonella enterica to polarized epithelial cells


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Insight Into the Giant Ca(2+)-Binding Adhesin Siie: Implications for the Adhesion of Salmonella Enterica to Polarized Epithelial Cells.

Griessl, M.H.Schmid, B.Kassler, K.Braunsmann, C.Ritter, R.Barlag, B.Stierhof, Y.Sturm, K.U.Danzer, C.Wagner, C.Schaffer, T.E.Sticht, H.Hensel, M.Muller, Y.A.

(2013) Structure 21: 741

  • DOI: 10.1016/j.str.2013.02.020
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • SiiE from Salmonella enterica is a giant 5,559-residue-long nonfimbrial adhesin that is secreted by a type 1 secretion system (T1SS) and initiates bacterial adhesion to polarized host cells. Structural insight has been gained into the 53 bacterial Ig ...

    SiiE from Salmonella enterica is a giant 5,559-residue-long nonfimbrial adhesin that is secreted by a type 1 secretion system (T1SS) and initiates bacterial adhesion to polarized host cells. Structural insight has been gained into the 53 bacterial Ig-like (BIg) domains of SiiE, which account for 94% of the entire SiiE sequence. The crystal structure of a fragment comprising BIg domains 50 to 52 of SiiE reveals the BIg domain architecture and highlights two types of SiiE-specific Ca²⁺-binding sites. Sequence homology considerations suggest that full-length SiiE interacts with more than 100 Ca²⁺ ions. Molecular dynamics simulations and single-molecule imaging indicate that Ca²⁺ binding confers SiiE with a rigid 200 nm rod-like habitus that is required to reach out beyond the Salmonella lipopolysaccharide layer and to promote adhesion to host cells. The crystal structure suggests plausible routes for the establishment of the initial contact between Salmonella and host cells.


    Related Citations: 
    • Crystallization and Preliminary Crystallographic Analysis of an Ig-Domain-Encompassing Fragment of the Giant Adhesion Protein Siie from Salmonella Enterica.
      Sturm, K.U.,Griessl, M.H.,Wagner, C.,Deiwick, J.,Hensel, M.,Muller, Y.A.
      (2011) Acta Crystallogr.,Sect.F 67: 1371


    Organizational Affiliation

    Lehrstuhl für Biotechnik, Department of Biology, Friedrich-Alexander-University of Erlangen-Nuremberg, 91054 Erlangen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PUTATIVE INNER MEMBRANE PROTEIN
A, B
288Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Find proteins for Q8ZKG6 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  Q8ZKG6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.206 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 129.400α = 90.00
b = 69.040β = 90.92
c = 67.260γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
REFMACrefinement
XDSdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-03
    Type: Initial release
  • Version 1.1: 2013-06-05
    Type: Database references