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Cse4 is the centromeric histone H3 variant in budding yeast. Psh1 is an E3 ubiquitin ligase that controls Cse4 levels through proteolysis. Here we report that Psh1 is phosphorylated by the Cka2 subunit of casein kinase 2 (CK2) to promote its E3 activity for Cse4. Deletion of CKA2 significantly stabilized Cse4. Consistent with phosphorylation promoting the activity of Psh1, Cse4 was stabilized in a Psh1 phosphodepleted mutant strain in which the major phosphorylation sites were changed to alanines. Phosphorylation of Psh1 did not control Psh1-Cse4 or Psh1-Ubc3(E2) interactions. Although Cse4 was highly stabilized in a cka2Δ strain, mislocalization of Cse4 was mild, suggesting that Cse4 misincorporation was prevented by the intact Psh1-Cse4 association. Supporting this idea, Psh1 was also stabilized in a cka2Δ strain. Collectively our data suggest that phosphorylation is crucial in Psh1-assisted control of Cse4 levels and that the Psh1-Cse4 association itself functions to prevent Cse4 misincorporation.
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