8BBG

Structure of the IFT-A complex; anterograde IFT-A train model


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

IFT-A structure reveals carriages for membrane protein transport into cilia.

Hesketh, S.J.Mukhopadhyay, A.G.Nakamura, D.Toropova, K.Roberts, A.J.

(2022) Cell 185: 4971

  • DOI: https://doi.org/10.1016/j.cell.2022.11.010
  • Primary Citation of Related Structures:  
    8BBE, 8BBF, 8BBG

  • PubMed Abstract: 

    Intraflagellar transport (IFT) trains are massive molecular machines that traffic proteins between cilia and the cell body. Each IFT train is a dynamic polymer of two large complexes (IFT-A and -B) and motor proteins, posing a formidable challenge to mechanistic understanding. Here, we reconstituted the complete human IFT-A complex and obtained its structure using cryo-EM. Combined with AlphaFold prediction and genome-editing studies, our results illuminate how IFT-A polymerizes, interacts with IFT-B, and uses an array of β-propeller and TPR domains to create "carriages" of the IFT train that engage TULP adaptor proteins. We show that IFT-A⋅TULP carriages are essential for cilia localization of diverse membrane proteins, as well as ICK-the key kinase regulating IFT train turnaround. These data establish a structural link between IFT-A's distinct functions, provide a blueprint for IFT-A in the train, and shed light on how IFT evolved from a proto-coatomer ancestor.


  • Organizational Affiliation

    Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck University of London, London, WC1E 7HX, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
WD repeat-containing protein 191,357Homo sapiensMutation(s): 0 
Gene Names: WDR19IFT144KIAA1638
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NEZ3 (Homo sapiens)
Go to UniProtKB:  Q8NEZ3
PHAROS:  Q8NEZ3
GTEx:  ENSG00000157796 
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Intraflagellar transport protein 140 homolog1,477Homo sapiensMutation(s): 0 
Gene Names: IFT140KIAA0590WDTC2
UniProt & NIH Common Fund Data Resources
Find proteins for Q96RY7 (Homo sapiens)
Go to UniProtKB:  Q96RY7
PHAROS:  Q96RY7
GTEx:  ENSG00000187535 
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Intraflagellar transport protein 122 homolog1,241Homo sapiensMutation(s): 0 
Gene Names: IFT122SPGWDR10WDR140
UniProt & NIH Common Fund Data Resources
Find proteins for Q9HBG6 (Homo sapiens)
Go to UniProtKB:  Q9HBG6
PHAROS:  Q9HBG6
GTEx:  ENSG00000163913 
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
SNAP-tag,Tetratricopeptide repeat protein 21B1,500Homo sapiensMutation(s): 0 
Gene Names: MGMTTTC21BIFT139KIAA1992Nbla10696
EC: 2.1.1.63
UniProt & NIH Common Fund Data Resources
Find proteins for Q7Z4L5 (Homo sapiens)
Go to UniProtKB:  Q7Z4L5
PHAROS:  Q7Z4L5
GTEx:  ENSG00000123607 
Sequence Annotations
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  • Reference Sequence
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
WD repeat-containing protein 351,184Homo sapiensMutation(s): 0 
Gene Names: WDR35IFT121KIAA1336
UniProt & NIH Common Fund Data Resources
Find proteins for Q9P2L0 (Homo sapiens)
Go to UniProtKB:  Q9P2L0
PHAROS:  Q9P2L0
GTEx:  ENSG00000118965 
Sequence Annotations
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  • Reference Sequence
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Intraflagellar transport protein 43 homolog209Homo sapiensMutation(s): 0 
Gene Names: IFT43C14orf179
UniProt & NIH Common Fund Data Resources
Find proteins for Q96FT9 (Homo sapiens)
Go to UniProtKB:  Q96FT9
PHAROS:  Q96FT9
GTEx:  ENSG00000119650 
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom202679/Z/16/Z
Wellcome TrustUnited Kingdom206166/Z/17/Z
Wellcome TrustUnited Kingdom217186/Z/19/Z
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/S007202/1

Revision History  (Full details and data files)

  • Version 1.0: 2022-12-21
    Type: Initial release
  • Version 1.1: 2023-01-04
    Changes: Database references
  • Version 1.2: 2024-07-24
    Changes: Data collection