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

Jen Hsuan Wei, Zi Chao Zhang, R. Max Wynn, Joachim Seemann

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Summary 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.

Original languageEnglish (US)
Article number8260
Pages (from-to)287-299
Number of pages13
JournalCell
Volume162
Issue number2
DOIs
StatePublished - Jul 18 2015

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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