Direct Binding of SAS-6 to ZYG-1 Recruits SAS-6 to the Mother Centriole for Cartwheel Assembly
Assembly of SAS-6 dimers to form the centriolar cartwheel requires the ZYG-1/Plk4 kinase. Here, we show that ZYG-1 recruits SAS-6 to the mother centriole independently of its kinase activity; kinase activity is subsequently required for cartwheel assembly. We identify a direct interaction between ZY...
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Published in | Developmental cell Vol. 25; no. 3; pp. 284 - 298 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Elsevier Inc
13.05.2013
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Subjects | |
Online Access | Get full text |
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Summary: | Assembly of SAS-6 dimers to form the centriolar cartwheel requires the ZYG-1/Plk4 kinase. Here, we show that ZYG-1 recruits SAS-6 to the mother centriole independently of its kinase activity; kinase activity is subsequently required for cartwheel assembly. We identify a direct interaction between ZYG-1 and the SAS-6 coiled coil that explains its kinase activity-independent function in SAS-6 recruitment. Perturbing this interaction, or the interaction between an adjacent segment of the SAS-6 coiled coil and SAS-5, prevented SAS-6 recruitment and cartwheel assembly. SAS-6 mutants with alanine substitutions in a previously described ZYG-1 target site or in 37 other residues, either phosphorylated by ZYG-1 in vitro or conserved in closely related nematodes, all supported cartwheel assembly. We propose that ZYG-1 binding to the SAS-6 coiled coil recruits the SAS-6-SAS-5 complex to the mother centriole, where a ZYG-1 kinase activity-dependent step, whose target is unlikely to be SAS-6, triggers cartwheel assembly.
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•SAS-6 recruitment to the mother centriole and cartwheel assembly are separable events•Direct binding of ZYG-1 to the SAS-6 coiled coil recruits SAS-6 to the assembly site•ZYG-1 kinase activity is required for cartwheel assembly but not SAS-6 recruitment•SAS-6 is unlikely to be a critical ZYG-1 kinase substrate during cartwheel assembly
The Plk4/ZYG-1 kinase controls SAS-6 assembly to form the centriolar cartwheel. Lettman et al. show that SAS-6 recruitment and polymerization are separable steps. ZYG-1 binding to the SAS-6 coiled coil recruits SAS-6 to the assembly site, where a kinase activity-dependent step, whose target is unlikely to be SAS-6, triggers SAS-6 polymerization. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1534-5807 1878-1551 |
DOI: | 10.1016/j.devcel.2013.03.011 |