1. CCDC61/VFL3 Is a Paralog of SAS6 and Promotes Ciliary Functions.
- Author
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Ochi T, Quarantotti V, Lin H, Jullien J, Rosa E Silva I, Boselli F, Barnabas DD, Johnson CM, McLaughlin SH, Freund SMV, Blackford AN, Kimata Y, Goldstein RE, Jackson SP, Blundell TL, Dutcher SK, Gergely F, and van Breugel M
- Subjects
- Algal Proteins chemistry, Algal Proteins metabolism, Cell Line, Chlamydomonas classification, Crystallography, X-Ray, HEK293 Cells, Humans, Microtubules metabolism, Models, Molecular, Phylogeny, Protein Conformation, Protein Domains, Protein Multimerization, Cell Cycle Proteins chemistry, Cell Cycle Proteins metabolism, Chlamydomonas physiology, Cilia metabolism, Microtubule-Associated Proteins chemistry, Microtubule-Associated Proteins metabolism
- Abstract
Centrioles are cylindrical assemblies whose peripheral microtubule array displays a 9-fold rotational symmetry that is established by the scaffolding protein SAS6. Centriole symmetry can be broken by centriole-associated structures, such as the striated fibers in Chlamydomonas that are important for ciliary function. The conserved protein CCDC61/VFL3 is involved in this process, but its exact role is unclear. Here, we show that CCDC61 is a paralog of SAS6. Crystal structures of CCDC61 demonstrate that it contains two homodimerization interfaces that are similar to those found in SAS6, but result in the formation of linear filaments rather than rings. Furthermore, we show that CCDC61 binds microtubules and that residues involved in CCDC61 microtubule binding are important for ciliary function in Chlamydomonas. Together, our findings suggest that CCDC61 and SAS6 functionally diverged from a common ancestor while retaining the ability to scaffold the assembly of basal body-associated structures or centrioles, respectively., Competing Interests: Declaration of Interests The authors declare no competing interests., (Copyright © 2020 MRC Laboratory of Molecular Biology. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2020
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