The Caenorhabditis elegans protein SAS-5 forms large oligomeric assemblies critical for centriole formation.

Abstract:

:Centrioles are microtubule-based organelles crucial for cell division, sensing and motility. In Caenorhabditis elegans, the onset of centriole formation requires notably the proteins SAS-5 and SAS-6, which have functional equivalents across eukaryotic evolution. Whereas the molecular architecture of SAS-6 and its role in initiating centriole formation are well understood, the mechanisms by which SAS-5 and its relatives function is unclear. Here, we combine biophysical and structural analysis to uncover the architecture of SAS-5 and examine its functional implications in vivo. Our work reveals that two distinct self-associating domains are necessary to form higher-order oligomers of SAS-5: a trimeric coiled coil and a novel globular dimeric Implico domain. Disruption of either domain leads to centriole duplication failure in worm embryos, indicating that large SAS-5 assemblies are necessary for function in vivo.

journal_name

Elife

journal_title

eLife

authors

Rogala KB,Dynes NJ,Hatzopoulos GN,Yan J,Pong SK,Robinson CV,Deane CM,Gönczy P,Vakonakis I

doi

10.7554/eLife.07410

subject

Has Abstract

pub_date

2015-05-29 00:00:00

pages

e07410

issn

2050-084X

journal_volume

4

pub_type

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