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The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes

In addition to their well-known role in microtubule organization, centrosomes function as signaling platforms and regulate cell cycle events. An important example of such a function is the spindle position checkpoint (SPOC) of budding yeast. SPOC is a surveillance mechanism that ensures alignment of...

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Autores principales: Caydasi, Ayse Koca, Micoogullari, Yagmur, Kurtulmus, Bahtiyar, Palani, Saravanan, Pereira, Gislene
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4091827/
https://www.ncbi.nlm.nih.gov/pubmed/24850890
http://dx.doi.org/10.1091/mbc.E14-04-0890
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author Caydasi, Ayse Koca
Micoogullari, Yagmur
Kurtulmus, Bahtiyar
Palani, Saravanan
Pereira, Gislene
author_facet Caydasi, Ayse Koca
Micoogullari, Yagmur
Kurtulmus, Bahtiyar
Palani, Saravanan
Pereira, Gislene
author_sort Caydasi, Ayse Koca
collection PubMed
description In addition to their well-known role in microtubule organization, centrosomes function as signaling platforms and regulate cell cycle events. An important example of such a function is the spindle position checkpoint (SPOC) of budding yeast. SPOC is a surveillance mechanism that ensures alignment of the mitotic spindle along the cell polarity axis. Upon spindle misalignment, phosphorylation of the SPOC component Bfa1 by Kin4 kinase engages the SPOC by changing the centrosome localization of Bfa1 from asymmetric (one centrosome) to symmetric (both centrosomes). Here we show that, unexpectedly, Kin4 alone is unable to break Bfa1 asymmetry at yeast centrosomes. Instead, phosphorylation of Bfa1 by Kin4 creates a docking site on Bfa1 for the 14-3-3 family protein Bmh1, which in turn weakens Bfa1–centrosome association and promotes symmetric Bfa1 localization. Consistently, BMH1-null cells are SPOC deficient. Our work thus identifies Bmh1 as a new SPOC component and refines the molecular mechanism that breaks Bfa1 centrosome asymmetry upon SPOC activation.
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spelling pubmed-40918272014-10-01 The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes Caydasi, Ayse Koca Micoogullari, Yagmur Kurtulmus, Bahtiyar Palani, Saravanan Pereira, Gislene Mol Biol Cell Articles In addition to their well-known role in microtubule organization, centrosomes function as signaling platforms and regulate cell cycle events. An important example of such a function is the spindle position checkpoint (SPOC) of budding yeast. SPOC is a surveillance mechanism that ensures alignment of the mitotic spindle along the cell polarity axis. Upon spindle misalignment, phosphorylation of the SPOC component Bfa1 by Kin4 kinase engages the SPOC by changing the centrosome localization of Bfa1 from asymmetric (one centrosome) to symmetric (both centrosomes). Here we show that, unexpectedly, Kin4 alone is unable to break Bfa1 asymmetry at yeast centrosomes. Instead, phosphorylation of Bfa1 by Kin4 creates a docking site on Bfa1 for the 14-3-3 family protein Bmh1, which in turn weakens Bfa1–centrosome association and promotes symmetric Bfa1 localization. Consistently, BMH1-null cells are SPOC deficient. Our work thus identifies Bmh1 as a new SPOC component and refines the molecular mechanism that breaks Bfa1 centrosome asymmetry upon SPOC activation. The American Society for Cell Biology 2014-07-15 /pmc/articles/PMC4091827/ /pubmed/24850890 http://dx.doi.org/10.1091/mbc.E14-04-0890 Text en © 2014 Caydasi, Micoogullari, et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,” “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society of Cell Biology.
spellingShingle Articles
Caydasi, Ayse Koca
Micoogullari, Yagmur
Kurtulmus, Bahtiyar
Palani, Saravanan
Pereira, Gislene
The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes
title The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes
title_full The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes
title_fullStr The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes
title_full_unstemmed The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes
title_short The 14-3-3 protein Bmh1 functions in the spindle position checkpoint by breaking Bfa1 asymmetry at yeast centrosomes
title_sort 14-3-3 protein bmh1 functions in the spindle position checkpoint by breaking bfa1 asymmetry at yeast centrosomes
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4091827/
https://www.ncbi.nlm.nih.gov/pubmed/24850890
http://dx.doi.org/10.1091/mbc.E14-04-0890
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