Centriole distal appendages promote membrane docking, leading to cilia initiation.
The distal appendages (DAPs) of centrioles have been proposed to anchor cilia to the plasma membrane, but their molecular composition, assembly, and exact function in ciliogenesis remain poorly understood. Using quantitative centrosome proteomics and superresolution microscopy, we identified five DAP components, including one previously described (CEP164), one partially characterized (CEP89 [ccdc123]), and three novel (CEP83 [ccdc41], SCLT1, and FBF1) DAP proteins. Analyses of DAP assembly revealed a hierarchy. CEP83 recruits both SCLT1 and CEP89 to centrioles. Subsequent recruitment of FBF1 and CEP164 is independent of CEP89 but mediated by SCLT1. All five DAP components are essential for ciliogenesis; loss of CEP83 specifically blocks centriole-to-membrane docking. Undocked centrioles fail to recruit TTBK2 or release CP110, the two earliest modifications found on centrioles prior to cilia assembly, revealing centriole-to-membrane docking as a temporal and spatial cue promoting cilia initiation.
Cell Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.
Barbara E
BE
Tanos
Hui-Ju
HJ
Yang
Rajesh
R
Soni
Won-Jing
WJ
Wang
Frank P
FP
Macaluso
John M
JM
Asara
Meng-Fu Bryan
MF
Tsou
D000818:Animals; D002460:Cell Line; D002502:Centrioles / Q000235:genetics / Q000378:metabolism*; D002923:Cilia / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D006367:HeLa Cells; D006801:Humans; D007425:Intracellular Membranes / Q000378:metabolism*; D051379:Mice; D011485:Protein Binding