Multi-site phosphorylation of yeast Mif2/CENP-C promotes inner kinetochore assembly.
Kinetochores control eukaryotic chromosome segregation by connecting chromosomal centromeres to spindle microtubules. Duplication of centromeric DNA necessitates kinetochore disassembly and subsequent reassembly on nascent sisters. To search for a regulatory mechanism that controls the earliest steps of this process, we studied Mif2/CENP-C, an essential basal component of the kinetochore. We ... found that phosphorylation of a central region of Mif2 (Mif2-PEST) enhances inner kinetochore assembly. Eliminating Mif2-PEST phosphorylation sites progressively impairs cellular fitness. The most severe Mif2-PEST mutations are lethal in cells lacking otherwise non-essential inner kinetochore factors. These data show that multi-site phosphorylation of Mif2/CENP-C controls inner kinetochore assembly.
Mesh Terms:
Centromere, Centromere Protein A, Chromosomal Proteins, Non-Histone, DNA-Binding Proteins, Kinetochores, Mitosis, Phosphorylation, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins
Centromere, Centromere Protein A, Chromosomal Proteins, Non-Histone, DNA-Binding Proteins, Kinetochores, Mitosis, Phosphorylation, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins
Curr Biol
Date: Feb. 27, 2023
PubMed ID: 36736323
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