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Phosphorylation of the F-BAR protein Hof1 drives septin ring splitting in budding yeast.

Authors :
Varela Salgado, Maritzaida
Adriaans, Ingrid E.
Touati, Sandra A.
Ibanes, Sandy
Lai-Kee-Him, Joséphine
Ancelin, Aurélie
Cipelletti, Luca
Picas, Laura
Piatti, Simonetta
Source :
Nature Communications; 4/22/2024, Vol. 15 Issue 1, p1-17, 17p
Publication Year :
2024

Abstract

A double septin ring accompanies cytokinesis in yeasts and mammalian cells. In budding yeast, reorganisation of the septin collar at the bud neck into a dynamic double ring is essential for actomyosin ring constriction and cytokinesis. Septin reorganisation requires the Mitotic Exit Network (MEN), a kinase cascade essential for cytokinesis. However, the effectors of MEN in this process are unknown. Here we identify the F-BAR protein Hof1 as a critical target of MEN in septin remodelling. Phospho-mimicking HOF1 mutant alleles overcome the inability of MEN mutants to undergo septin reorganisation by decreasing Hof1 binding to septins and facilitating its translocation to the actomyosin ring. Hof1-mediated septin rearrangement requires its F-BAR domain, suggesting that it may involve a local membrane remodelling that leads to septin reorganisation. In vitro Hof1 can induce the formation of intertwined septin bundles, while a phosphomimetic Hof1 protein has impaired septin-bundling activity. Altogether, our data indicate that Hof1 modulates septin architecture in distinct ways depending on its phosphorylation status. Cytokinesis in budding yeast is accompanied by a major rearrangement of septins into a double ring. Here, authors show that the F-BAR protein Hof1 contributes to septin remodeling upon its phosphorylation and relocalisation from septins to the division site. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20411723
Volume :
15
Issue :
1
Database :
Complementary Index
Journal :
Nature Communications
Publication Type :
Academic Journal
Accession number :
176781318
Full Text :
https://doi.org/10.1038/s41467-024-47709-3