3U66

Crystal structure of T6SS SciP/TssL from Escherichia Coli Enteroaggregative 042


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.63 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural characterization and oligomerization of the TssL protein, a component shared by bacterial type VI and type IVb secretion systems.

Durand, E.Zoued, A.Spinelli, S.Watson, P.J.Aschtgen, M.S.Journet, L.Cambillau, C.Cascales, E.

(2012) J.Biol.Chem. 287: 14157-14168

  • DOI: 10.1074/jbc.M111.338731

  • PubMed Abstract: 
  • The Type VI secretion system (T6SS) is a macromolecular system distributed in Gram-negative bacteria, responsible for the secretion of effector proteins into target cells. The T6SS has a broad versatility as it can target both eukaryotic and prokaryo ...

    The Type VI secretion system (T6SS) is a macromolecular system distributed in Gram-negative bacteria, responsible for the secretion of effector proteins into target cells. The T6SS has a broad versatility as it can target both eukaryotic and prokaryotic cells. It is therefore involved in host pathogenesis or killing neighboring bacterial cells to colonize a new niche. At the architecture level, the T6SS core apparatus is composed of 13 proteins, which assemble in two subcomplexes. One of these subcomplexes, composed of subunits that share structural similarities with bacteriophage tail and baseplate components, is anchored to the cell envelope by the membrane subcomplex. This latter is constituted of at least three proteins, TssL, TssM, and TssJ. The crystal structure of the TssJ outer membrane lipoprotein and its interaction with the inner membrane TssM protein have been recently reported. TssL and TssM share sequence homology and characteristics with two components of the Type IVb secretion system (T4bSS), IcmH/DotU and IcmF, respectively. In this study, we report the crystal structure of the cytoplasmic domain of the TssL inner membrane protein from the enteroaggregative Escherichia coli Sci-1 T6SS. It folds as a hook-like structure composed of two three-helix bundles. Two TssL molecules associate to form a functional complex. Although the TssL trans-membrane segment is the main determinant of self-interaction, contacts between the cytoplasmic domains are required for TssL function. Based on sequence homology and secondary structure prediction, we propose that the TssL structure is the prototype for the members of the TssL and IcmH/DotU families.


    Organizational Affiliation

    Aix-Marseille Université, Architecture et Fonction des Macromolécules Biologiques, Campus de Luminy, Case 932, 13288 Marseille Cedex 09, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative type VI secretion protein
A
183Escherichia coli O44:H18 (strain 042 / EAEC)Mutation(s): 0 
Find proteins for D3GU40 (Escherichia coli O44:H18 (strain 042 / EAEC))
Go to UniProtKB:  D3GU40
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.63 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.235 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 51.610α = 90.00
b = 82.030β = 90.00
c = 96.080γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
BUSTERrefinement
XSCALEdata scaling
PHASERphasing
SHELXDphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2013-01-09
    Type: Database references
  • Version 1.2: 2017-11-08
    Type: Refinement description