PMID: 30858376
Kim TS, Zhang L, Il Ahn J, Meng L, Chen Y, Lee E, Bang JK, Lim JM, Ghirlando R, Fan L, Wang YX, Kim BY, Park JE, Lee KS
Molecular architecture of a cylindrical self-assembly at human centrosomes.
Nat Commun. 2019 Mar 11;10(1):1151. doi: 10.1038/s41467-019-08838-2.
The cell is constructed by higher-order structures and organelles through complex interactions among distinct structural constituents. The centrosome is a membraneless organelle composed of two microtubule-derived structures called centrioles and an amorphous mass of pericentriolar material. Super-resolution microscopic analyses in various organisms revealed that diverse pericentriolar material proteins are concentrically localized around a centriole in a highly organized manner. However, the molecular nature underlying these organizations remains unknown. Here we show that two human pericentriolar material scaffolds, Cep63 and Cep152, cooperatively generate a heterotetrameric alpha-helical bundle that functions in conjunction with its neighboring hydrophobic motifs to self-assemble into a higher-order cylindrical architecture capable of recruiting downstream components, including Plk4, a key regulator for centriole duplication. Mutations disrupting the self-assembly abrogate Plk4-mediated centriole duplication. Because pericentriolar material organization is evolutionarily conserved, this work may offer a paradigm for investigating the assembly and function of centrosomal scaffolds in various organisms.