Abstract:
:Spindle assembly required during mitosis depends on microtubule polymerization. We demonstrate that the evolutionarily conserved low-complexity protein, BuGZ, undergoes phase transition or coacervation to promote assembly of both spindles and their associated components. BuGZ forms temperature-dependent liquid droplets alone or on microtubules in physiological buffers. Coacervation in vitro or in spindle and spindle matrix depends on hydrophobic residues in BuGZ. BuGZ coacervation and its binding to microtubules and tubulin are required to promote assembly of spindle and spindle matrix in Xenopus egg extract and in mammalian cells. Since several previously identified spindle-associated components also contain low-complexity regions, we propose that coacervating proteins may be a hallmark of proteins that comprise a spindle matrix that functions to promote assembly of spindles by concentrating its building blocks.
journal_name
Celljournal_title
Cellauthors
Jiang H,Wang S,Huang Y,He X,Cui H,Zhu X,Zheng Ydoi
10.1016/j.cell.2015.08.010subject
Has Abstractpub_date
2015-09-24 00:00:00pages
108-22issue
1eissn
0092-8674issn
1097-4172pii
S0092-8674(15)01023-5journal_volume
163pub_type
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