2V6L

Molecular Model of a Type III Secretion System Needle


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 16 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Molecular model of a type III secretion system needle: Implications for host-cell sensing.

Deane, J.E.Roversi, P.Cordes, F.S.Johnson, S.Kenjale, R.Daniell, S.Booy, F.Picking, W.D.Picking, W.L.Blocker, A.J.Lea, S.M.

(2006) Proc. Natl. Acad. Sci. U.S.A. 103: 12529-12533

  • DOI: 10.1073/pnas.0602689103
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Type III secretion systems are essential virulence determinants for many Gram-negative bacterial pathogens. The type III secretion system consists of cytoplasmic, transmembrane, and extracellular domains. The extracellular domain is a hollow needle p ...

    Type III secretion systems are essential virulence determinants for many Gram-negative bacterial pathogens. The type III secretion system consists of cytoplasmic, transmembrane, and extracellular domains. The extracellular domain is a hollow needle protruding above the bacterial surface and is held within a basal body that traverses both bacterial membranes. Effector proteins are translocated, via this external needle, directly into host cells, where they subvert normal cell functions to aid infection. Physical contact with host cells initiates secretion and leads to formation of a pore, thought to be contiguous with the needle channel, in the host-cell membrane. Here, we report the crystal structure of the Shigella flexneri needle subunit MxiH and a complete model for the needle assembly built into our three-dimensional EM reconstruction. The model, combined with mutagenesis data, reveals that signaling of host-cell contact is relayed through the needle via intersubunit contacts and suggests a mode of binding for a tip complex.


    Related Citations: 
    • Helical Structure of the Needle of the Type III Secretion System of Shigella Flexneri
      Cordes, F.S.,Komoriya, K.,Larquet, E.,Yang, S.,Egelman, E.H.,Blocker, A.J.,Lea, S.M.
      (2003) J.Biol.Chem. 278: 17103


    Organizational Affiliation

    Laboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MXIH
0, 1, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
83Shigella flexneriMutation(s): 0 
Gene Names: mxiH
Find proteins for P0A223 (Shigella flexneri)
Go to UniProtKB:  P0A223
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 16 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-07-31
    Type: Initial release
  • Version 1.1: 2013-08-07
    Type: Derived calculations, Other, Structure summary, Version format compliance
  • Version 1.2: 2017-08-02
    Type: Data collection, Refinement description
  • Version 1.3: 2018-03-28
    Type: Database references, Source and taxonomy