Cell-free reconstitution reveals centriole cartwheel assembly mechanisms

Guichard, P. and Hamel, V. and Le Guennec, M. and Banterle, N. and Iacovache, I. and Nemčíková, V. and Flückiger, I. and Goldie, K. N. and Stahlberg, H. and Lévy, D. and Zuber, B. and Gönczy, P.. (2017) Cell-free reconstitution reveals centriole cartwheel assembly mechanisms. Nature Communications, 8. p. 14813.

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Official URL: http://edoc.unibas.ch/56293/

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How cellular organelles assemble is a fundamental question in biology. The centriole organelle organizes around a nine-fold symmetrical cartwheel structure typically ∼100 nm high comprising a stack of rings that each accommodates nine homodimers of SAS-6 proteins. Whether nine-fold symmetrical ring-like assemblies of SAS-6 proteins harbour more peripheral cartwheel elements is unclear. Furthermore, the mechanisms governing ring stacking are not known. Here we develop a cell-free reconstitution system for core cartwheel assembly. Using cryo-electron tomography, we uncover that the Chlamydomonas reinhardtii proteins CrSAS-6 and Bld10p together drive assembly of the core cartwheel. Moreover, we discover that CrSAS-6 possesses autonomous properties that ensure self-organized ring stacking. Mathematical fitting of reconstituted cartwheel height distribution suggests a mechanism whereby preferential addition of pairs of SAS-6 rings governs cartwheel growth. In conclusion, we have developed a cell-free reconstitution system that reveals fundamental assembly principles at the root of centriole biogenesis.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Stahlberg)
UniBasel Contributors:Stahlberg, Henning
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:12 Oct 2017 09:22
Deposited On:12 Oct 2017 09:22

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