A new layer of regulation of chromosomal passenger complex (CPC) translocation in budding yeast

The conserved chromosomal passenger complex (CPC) consists of Ipl1 , Sli15 , Bir1 , and Nbl1 , and localizes at the kinetochore/centromere to correct kinetochore attachment errors and to prevent checkpoint silencing. After anaphase entry, the CPC moves from the kinetochore/centromere to the spindle....

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Bibliographic Details
Published in:Molecular biology of the cell 2023-09, Vol.34 (10), p.ar97-ar97
Main Authors: Sherwin, Delaney, Gutierrez-Morton, Emily, Bokros, Michael, Haluska, Cory, Wang, Yanchang
Format: Article
Language:English
Subjects:
Analysis
Centromere - metabolism
Centromeres
Enzymes
Genetic aspects
Identification and classification
Kinetochores - metabolism
Methods
Microtubule-Associated Proteins - metabolism
Microtubules - metabolism
Phosphorylation
Saccharomyces cerevisiae - metabolism
Saccharomyces cerevisiae Proteins - metabolism
Saccharomycetales - metabolism
Spindle Apparatus - metabolism
Yeast fungi
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Summary:The conserved chromosomal passenger complex (CPC) consists of Ipl1 , Sli15 , Bir1 , and Nbl1 , and localizes at the kinetochore/centromere to correct kinetochore attachment errors and to prevent checkpoint silencing. After anaphase entry, the CPC moves from the kinetochore/centromere to the spindle. In budding yeast, CPC subunit Sli15 is phosphorylated by both cyclin-dependent kinase (CDK) and Ipl1 kinase. Following anaphase onset, activated Cdc14 phosphatase reverses Sli15 phosphorylation imposed by CDK to promote CPC translocation. Although abolished Sli15 phosphorylation imposed by Ipl1 also causes CPC translocation, the regulation of Ipl1-imposed Sli15 phosphorylation remains unclear. In addition to Sli15, Cdc14 also dephosphorylates Fin1, a regulatory subunit of protein phosphatase 1 (PP1), to enable kinetochore localization of Fin1-PP1. Here, we present evidence supporting the notion that kinetochore-localized Fin1-PP1 likely reverses Ipl1-imposed Sli15 phosphorylation to promote CPC translocation from the kinetochore/centromere to the spindle. Importantly, premature Fin1 kinetochore localization or phospho-deficient mutation causes checkpoint defects in response to tensionless attachments, resulting in chromosome missegregation. In addition, our data indicate that reversion of CDK- and Ipl1-imposed Sli15 phosphorylation shows an additive effect on CPC translocation. Together, these results reveal a previously unidentified pathway to regulate CPC translocation, which is important for accurate chromosome segregation.
ISSN:1059-1524
1939-4586
DOI:10.1091/mbc.E23-02-0063