Recognition and targeting mechanisms by chaperones in flagella assembly and operation

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

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This is version 1.4 of the entry. See complete history


Recognition and targeting mechanisms by chaperones in flagellum assembly and operation.

Khanra, N.Rossi, P.Economou, A.Kalodimos, C.G.

(2016) Proc Natl Acad Sci U S A 113: 9798-9803

  • DOI: https://doi.org/10.1073/pnas.1607845113
  • Primary Citation of Related Structures:  
    5KP0, 5KRW, 5KS6

  • PubMed Abstract: 

    The flagellum is a complex bacterial nanomachine that requires the proper assembly of several different proteins for its function. Dedicated chaperones are central in preventing aggregation or undesired interactions of flagellar proteins, including their targeting to the export gate. FliT is a key flagellar chaperone that binds to several flagellar proteins in the cytoplasm, including its cognate filament-capping protein FliD. We have determined the solution structure of the FliT chaperone in the free state and in complex with FliD and the flagellar ATPase FliI. FliT adopts a four-helix bundle and uses a hydrophobic surface formed by the first three helices to recognize its substrate proteins. We show that the fourth helix constitutes the binding site for FlhA, a membrane protein at the export gate. In the absence of a substrate protein FliT adopts an autoinhibited structure wherein both the binding sites for substrates and FlhA are occluded. Substrate binding to FliT activates the complex for FlhA binding and thus targeting of the chaperone-substrate complex to the export gate. The activation and targeting mechanisms reported for FliT appear to be shared among the other flagellar chaperones.

  • Organizational Affiliation

    Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455;

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar protein FliT,Flagellum-specific ATP synthase140Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 0 
Gene Names: fliTSTM1962fliIfla AIIIflaCSTM1972
Find proteins for P0A1N2 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1N2 
Go to UniProtKB:  P0A1N2
Find proteins for P26465 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P26465 
Go to UniProtKB:  P26465
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP0A1N2P26465
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI094623

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-17
    Type: Initial release
  • Version 1.1: 2016-08-31
    Changes: Database references
  • Version 1.2: 2016-09-14
    Changes: Database references
  • Version 1.3: 2022-03-23
    Changes: Author supporting evidence, Data collection, Database references, Structure summary
  • Version 1.4: 2024-05-15
    Changes: Data collection, Database references