Abstract:
:Centrosomes are non-membrane-bound compartments that nucleate microtubule arrays. They consist of nanometer-scale centrioles surrounded by a micron-scale, dynamic assembly of protein called the pericentriolar material (PCM). To study how PCM forms a spherical compartment that nucleates microtubules, we reconstituted PCM-dependent microtubule nucleation in vitro using recombinant C. elegans proteins. We found that macromolecular crowding drives assembly of the key PCM scaffold protein SPD-5 into spherical condensates that morphologically and dynamically resemble in vivo PCM. These SPD-5 condensates recruited the microtubule polymerase ZYG-9 (XMAP215 homolog) and the microtubule-stabilizing protein TPXL-1 (TPX2 homolog). Together, these three proteins concentrated tubulin ∼4-fold over background, which was sufficient to reconstitute nucleation of microtubule asters in vitro. Our results suggest that in vivo PCM is a selective phase that organizes microtubule arrays through localized concentration of tubulin by microtubule effector proteins.
journal_name
Celljournal_title
Cellauthors
Woodruff JB,Ferreira Gomes B,Widlund PO,Mahamid J,Honigmann A,Hyman AAdoi
10.1016/j.cell.2017.05.028subject
Has Abstractpub_date
2017-06-01 00:00:00pages
1066-1077.e10issue
6eissn
0092-8674issn
1097-4172pii
S0092-8674(17)30589-5journal_volume
169pub_type
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