GM130 Regulates Golgi-Derived Spindle Assembly by Activating TPX2 and Capturing Microtubules.

Abstract:

:Spindle assembly requires the coordinated action of multiple cellular structures to nucleate and organize microtubules in a precise spatiotemporal manner. Among them, the contributions of centrosomes, chromosomes, and microtubules have been well studied, yet the involvement of membrane-bound organelles remains largely elusive. Here, we provide mechanistic evidence for a membrane-based, Golgi-derived microtubule assembly pathway in mitosis. Upon mitotic entry, the Golgi matrix protein GM130 interacts with importin α via a classical nuclear localization signal that recruits importin α to the Golgi membranes. Sequestration of importin α by GM130 liberates the spindle assembly factor TPX2, which activates Aurora-A kinase and stimulates local microtubule nucleation. Upon filament assembly, nascent microtubules are further captured by GM130, thus linking Golgi membranes to the spindle. Our results reveal an active role for the Golgi in regulating spindle formation to ensure faithful organelle inheritance.

journal_name

Cell

journal_title

Cell

authors

Wei JH,Zhang ZC,Wynn RM,Seemann J

doi

10.1016/j.cell.2015.06.014

subject

Has Abstract

pub_date

2015-07-16 00:00:00

pages

287-299

issue

2

eissn

0092-8674

issn

1097-4172

pii

S0092-8674(15)00697-2

journal_volume

162

pub_type

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