Spindle pole bodies function as signal amplifiers in the Mitotic Exit Network
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mbc.e19-10-0584.pdf
Description
Published version
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9.27 MB
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Author(s)
Campbell, Ian W
Zhou, Xiaoxue
Amon, Angelika
Date Issued
2020
Journal
Molecular Biology of the Cell
Publisher
American Society for Cell Biology (ASCB)
Version
Final published version
Abstract
© 2020 Campbell et al. The Mitotic Exit Network (MEN), a budding yeast Ras-like signal transduction cascade, translates nuclear position into a signal to exit from mitosis. Here we describe how scaffolding the MEN onto spindle pole bodies (SPB—centrosome equivalent) allows the MEN to couple the final stages of mitosis to spindle position. Through the quantitative analysis of the localization of MEN components, we determined the relative importance of MEN signaling from the SPB that is delivered into the daughter cell (dSPB) during anaphase and the SPB that remains in the mother cell. Movement of half of the nucleus into the bud during anaphase causes the active form of the MEN GTPase Tem1 to accumulate at the dSPB. In response to Tem1’s activity at the dSPB, the MEN kinase cascade, which functions downstream of Tem1, accumulates at both SPBs. This localization to both SPBs serves an important role in promoting efficient exit from mitosis. Cells that harbor only one SPB delay exit from mitosis. We propose that MEN signaling is initiated by Tem1 at the dSPB and that association of the downstream MEN kinases with both SPBs serves to amplify MEN signaling, enabling the timely exit from mitosis.
MIT Department
Koch Institute for Integrative Cancer Research at MIT
Howard Hughes Medical Institute
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1091/MBC.E19-10-0584
