6CH3

Crystal structure of the cytoplasmic domain of FlhA and FliS-FliC complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.234 

wwPDB Validation   3D Report Full Report


This is version 1.2 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:  
    6CH3, 6CH2, 6CH1

  • 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 cytoplasmic chaperones for their transport through the membrane ...

    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. babis.kalodimos@stjude.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar biosynthesis protein FlhAA331Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 0 
Gene Names: flhASTM1913
Find proteins for P40729 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P40729 
Go to UniProtKB:  P40729
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Flagellar secretion chaperone FliS,FlagellinB198Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Salmonella enterica subsp. enterica serovar TyphiMutation(s): 0 
Gene Names: fliSSTM1961t0916fliCflaFhagSTM1959
Find proteins for P26609 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P26609 
Go to UniProtKB:  P26609
Find proteins for P06179 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P06179 
Go to UniProtKB:  P06179
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.234 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.298α = 90
b = 88.623β = 90
c = 117.327γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-16
    Type: Initial release
  • Version 1.1: 2019-09-18
    Changes: Data collection
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence