Download MendeleyThe homo-oligomerisation of both Sas-6 and Ana2 is required for efficient centriole assembly in flies.
Cottee, M.A., Muschalik, N., Johnson, S., Leveson, J., Raff, J.W., Lea, S.M.(2015) Elife 4: e07236-e07236
- PubMed: 26002084
- DOI: https://doi.org/10.7554/eLife.07236
- Primary Citation of Related Structures:
5AL6, 5AL7 - PubMed Abstract:
Sas-6 and Ana2/STIL proteins are required for centriole duplication and the homo-oligomerisation properties of Sas-6 help establish the ninefold symmetry of the central cartwheel that initiates centriole assembly. Ana2/STIL proteins are poorly conserved, but they all contain a predicted Central Coiled-Coil Domain (CCCD). Here we show that the Drosophila Ana2 CCCD forms a tetramer, and we solve its structure to 0.8 Å, revealing that it adopts an unusual parallel-coil topology. We also solve the structure of the Drosophila Sas-6 N-terminal domain to 2.9 Å revealing that it forms higher-order oligomers through canonical interactions. Point mutations that perturb Sas-6 or Ana2 homo-oligomerisation in vitro strongly perturb centriole assembly in vivo. Thus, efficient centriole duplication in flies requires the homo-oligomerisation of both Sas-6 and Ana2, and the Ana2 CCCD tetramer structure provides important information on how these proteins might cooperate to form a cartwheel structure.
Organizational Affiliation:
Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom.
