FliT-FliJ fusion complex

Experimental Data Snapshot

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

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Chaperone Recycling in Late-Stage Flagellar Assembly.

Rossi, P.Xing, Q.Bini, E.Portaliou, A.G.Clay, M.C.Warren, E.M.Khanra, N.K.Economou, A.Kalodimos, C.G.

(2023) J Mol Biol 435: 167954-167954

  • DOI: https://doi.org/10.1016/j.jmb.2023.167954
  • Primary Citation of Related Structures:  
    8FTW, 8FTX

  • PubMed Abstract: 

    The flagellum is a sophisticated nanomachine responsible for motility in Gram-negative bacteria. Flagellar assembly is a strictly choreographed process, in which the motor and export gate are formed first, followed by the extracellular propeller structure. Extracellular flagellar components are escorted to the export gate by dedicated molecular chaperones for secretion and self-assembly at the apex of the emerging structure. The detailed mechanisms of chaperone-substrate trafficking at the export gate remain poorly understood. Here, we structurally characterized the interaction of Salmonella enterica late-stage flagellar chaperones FliT and FlgN with the export controller protein FliJ. Previous studies showed that FliJ is absolutely required for flagellar assembly since its interaction with chaperone-client complexes controls substrate delivery to the export gate. Our biophysical and cell-based data show that FliT and FlgN bind FliJ cooperatively, with high affinity and on specific sites. Chaperone binding completely disrupts the FliJ coiled-coil structure and alters its interactions with the export gate. We propose that FliJ aids the release of substrates from the chaperone and forms the basis of chaperone recycling during late-stage flagellar assembly.

  • Organizational Affiliation

    Deparment of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Flagellar FliT protein, Flagellar FliJ protein fusion166Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: fliTfliJ
Find proteins for P0A1K1 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1K1 
Go to UniProtKB:  P0A1K1
Find proteins for P0A1N2 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1N2 
Go to UniProtKB:  P0A1N2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP0A1K1P0A1N2
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: 2023-07-05
    Type: Initial release
  • Version 1.1: 2023-11-01
    Changes: Data collection, Database references