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Binding of IFT22 to the intraflagellar transport complex is essential for flagellum assembly

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  • Stefanie Wachter, Max Planck Institute of Biochemistry
  • ,
  • Jamin Jung, Institut Pasteur, Paris
  • ,
  • Shahaan Shafiq, Institut Pasteur, Paris
  • ,
  • Jerome Basquin, Max Planck Institute of Biochemistry
  • ,
  • Cécile Fort, Institut Pasteur, Paris
  • ,
  • Philippe Bastin, Institut Pasteur, Paris
  • ,
  • Esben Lorentzen

Intraflagellar transport (IFT) relies on motor proteins and the IFT complex to construct cilia and flagella. The IFT complex subunit IFT22/RabL5 has sequence similarity with small GTPases although the nucleotide specificity is unclear because of non-conserved G4/G5 motifs. We show that IFT22 specifically associates with G-nucleotides and present crystal structures of IFT22 in complex with GDP, GTP, and with IFT74/81. Our structural analysis unravels an unusual GTP/GDP-binding mode of IFT22 bypassing the classical G4 motif. The GTPase switch regions of IFT22 become ordered upon complex formation with IFT74/81 and mediate most of the IFT22-74/81 interactions. Structure-based mutagenesis reveals that association of IFT22 with the IFT complex is essential for flagellum construction in Trypanosoma brucei although IFT22 GTP-loading is not strictly required.

TidsskriftEMBO Journal
StatusUdgivet - maj 2019

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