FAP206 is a microtubule-docking adapter for ciliary radial spoke 2 and dynein c

Krishna Kumar Vasudevan, Kangkang Song, Lea M. Alford, Winfield S. Sale, Erin E. Dymek, Elizabeth F. Smith, Todd Hennessey, Ewa Joachimiak, Paulina Urbanska, Dorota Wloga, William Dentler, Daniela Nicastro, Jacek Gaertig

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8 Scopus citations


Radial spokes are conserved macromolecular complexes that are essential for ciliary motility. A triplet of three radial spokes, RS1, RS2, and RS3, repeats every 96 nm along the doublet microtubules. Each spoke has a distinct base that docks to the doublet and is linked to different inner dynein arms. Little is known about the assembly and functions of individual radial spokes. A knockout of the conserved ciliary protein FAP206 in the ciliate Tetrahymena resulted in slow cell motility. Cryo-electron tomography showed that in the absence of FAP206, the 96-nm repeats lacked RS2 and dynein c. Occasionally, RS2 assembled but lacked both the front prong of its microtubule base and dynein c, whose tail is attached to the front prong. Overexpressed GFP-FAP206 decorated nonciliary microtubules in vivo. Thus FAP206 is likely part of the front prong and docks RS2 and dynein c to the microtubule.

Original languageEnglish (US)
Pages (from-to)696-710
Number of pages15
JournalMolecular biology of the cell
Issue number4
StatePublished - Feb 15 2015


ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Cite this

Vasudevan, K. K., Song, K., Alford, L. M., Sale, W. S., Dymek, E. E., Smith, E. F., Hennessey, T., Joachimiak, E., Urbanska, P., Wloga, D., Dentler, W., Nicastro, D., & Gaertig, J. (2015). FAP206 is a microtubule-docking adapter for ciliary radial spoke 2 and dynein c. Molecular biology of the cell, 26(4), 696-710. https://doi.org/10.1091/mbc.E14-11-1506