4NRH

CopN-Scc3 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A gatekeeper chaperone complex directs translocator secretion during type three secretion.

Archuleta, T.L.Spiller, B.W.

(2014) Plos Pathog. 10: e1004498-e1004498

  • DOI: 10.1371/journal.ppat.1004498

  • PubMed Abstract: 
  • Many Gram-negative bacteria use Type Three Secretion Systems (T3SS) to deliver effector proteins into host cells. These protein delivery machines are composed of cytosolic components that recognize substrates and generate the force needed for translo ...

    Many Gram-negative bacteria use Type Three Secretion Systems (T3SS) to deliver effector proteins into host cells. These protein delivery machines are composed of cytosolic components that recognize substrates and generate the force needed for translocation, the secretion conduit, formed by a needle complex and associated membrane spanning basal body, and translocators that form the pore in the target cell. A defined order of secretion in which needle component proteins are secreted first, followed by translocators, and finally effectors, is necessary for this system to be effective. While the secreted effectors vary significantly between organisms, the ∼20 individual protein components that form the T3SS are conserved in many pathogenic bacteria. One such conserved protein, referred to as either a plug or gatekeeper, is necessary to prevent unregulated effector release and to allow efficient translocator secretion. The mechanism by which translocator secretion is promoted while effector release is inhibited by gatekeepers is unknown. We present the structure of the Chlamydial gatekeeper, CopN, bound to a translocator-specific chaperone. The structure identifies a previously unknown interface between gatekeepers and translocator chaperones and reveals that in the gatekeeper-chaperone complex the canonical translocator-binding groove is free to bind translocators. Structure-based mutagenesis of the homologous complex in Shigella reveals that the gatekeeper-chaperone-translocator complex is essential for translocator secretion and for the ordered secretion of translocators prior to effectors.


    Organizational Affiliation

    Chemical and Physical Biology Program, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CopN
A, C
321Chlamydia pneumoniaeMutation(s): 0 
Gene Names: lcrE
Find proteins for Q9Z8L4 (Chlamydia pneumoniae)
Go to UniProtKB:  Q9Z8L4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chaperone SycD
B, D
178Chlamydia pneumoniaeMutation(s): 0 
Gene Names: lcrH_2
Find proteins for Q9Z6N8 (Chlamydia pneumoniae)
Go to UniProtKB:  Q9Z6N8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A, C
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.571α = 90.00
b = 96.183β = 92.27
c = 94.472γ = 90.00
Software Package:
Software NamePurpose
PHENIXmodel building
MD2data collection
HKL-2000data scaling
PHENIXphasing
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2015-03-04
    Type: Database references