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Biochemically validated structural model of the 15-subunit intraflagellar transport complex IFT-B.
EMBO J. 41:e112440 (2022)
Publ. Version/Full Text
Research data
DOI
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Cilia are ubiquitous eukaryotic organelles impotant for cellular motility, signaling, and sensory reception. Cilium formation requires intraflagellar transport of structural and signaling components and involves 22 different proteins organized into intraflagellar transport (IFT) complexes IFT-A and IFT-B that are transported by molecular motors. The IFT-B complex constitutes the backbone of polymeric IFT trains carrying cargo between the cilium and the cell body. Currently, high-resolution structures are only available for smaller IFT-B subcomplexes leaving > 50% structurally uncharacterized. Here, we used Alphafold to structurally model the 15-subunit IFT-B complex. The model was validated using cross-linking/mass-spectrometry data on reconstituted IFT-B complexes, X-ray scattering in solution, diffraction from crystals as well as site-directed mutagenesis and protein-binding assays. The IFT-B structure reveals an elongated and highly flexible complex consistent with cryo-electron tomographic reconstructions of IFT trains. The IFT-B complex organizes into IFT-B1 and IFT-B2 parts with binding sites for ciliary cargo and the inactive IFT dynein motor, respectively. Interestingly, our results are consistent with two different binding sites for IFT81/74 on IFT88/70/52/46 suggesting the possibility of different structural architectures for the IFT-B1 complex. Our data present a structural framework to understand IFT-B complex assembly, function, and ciliopathy variants.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Alphafold ; Cilium ; Ift-b Structure ; Intraflagellar Transport ; Structural Modeling; Core Complex; Cytoplasmic Dynein; Crystal-structure; Kinesin-ii; Protein; Links; Bbsome; Ciliogenesis; Architecture; Component
ISSN (print) / ISBN
0261-4189
e-ISSN
1460-2075
Journal
EMBO Journal, The
Quellenangaben
Volume: 41,
Issue: 24,
Article Number: e112440
Publisher
Wiley
Publishing Place
Heidelberg, Germany
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Structural Biology (STB)
Grants
Novo Nordisk Fonden (NNF)