6CH2

Crystal structure of the cytoplasmic domain of FlhA and FliT-FliD complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structures of chaperone-substrate complexes docked onto the export gate in a type III secretion system.

Xing, Q.Shi, K.Portaliou, A.Rossi, P.Economou, A.Kalodimos, C.G.

(2018) Nat Commun 9: 1773-1773

  • DOI: 10.1038/s41467-018-04137-4
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The flagellum and the injectisome enable bacterial locomotion and pathogenesis, respectively. These nanomachines assemble and function using a type III secretion system (T3SS). Exported proteins are delivered to the export apparatus by dedicated cyto ...

    The flagellum and the injectisome enable bacterial locomotion and pathogenesis, respectively. These nanomachines assemble and function using a type III secretion system (T3SS). Exported proteins are delivered to the export apparatus by dedicated cytoplasmic chaperones for their transport through the membrane. The structural and mechanistic basis of this process is poorly understood. Here we report the structures of two ternary complexes among flagellar chaperones (FliT and FliS), protein substrates (the filament-capping FliD and flagellin FliC), and the export gate platform protein FlhA. The substrates do not interact directly with FlhA; however, they are required to induce a binding-competent conformation to the chaperone that exposes the recognition motif featuring a highly conserved sequence recognized by FlhA. The structural data reveal the recognition signal in a class of T3SS proteins and provide new insight into the assembly of key protein complexes at the export gate.


    Organizational Affiliation

    Department of Structural Biology, St. Jude Children's Research Hospital, 263 Danny Thomas Place, Memphis, TN, 38105, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Flagellar biosynthesis protein FlhA
A, B, C
334Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: flhA
Find proteins for P40729 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P40729
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Flagellar hook-associated protein 2,Flagellar protein FliT
D, E, F
179Salmonella typhiSalmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)
This entity is chimeric
Mutation(s): 0 
Gene Names: fliT, fliD (flaV, flbC)
Find proteins for P0A1N3 (Salmonella typhi)
Go to UniProtKB:  P0A1N3
Find proteins for P16328 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P16328
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.233 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 49.110α = 86.88
b = 77.590β = 89.00
c = 119.270γ = 84.27
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM118047
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM073854

Revision History 

  • Version 1.0: 2018-05-16
    Type: Initial release