A Dual Inhibitory Mechanism Sufficient to Maintain Cell-Cycle-Restricted CENP-A Assembly

Ana Stankovic, Lucie Y. Guo, João F. Mata, Dani L. Bodor, Xing Jun Cao, Aaron O. Bailey, Jeffrey Shabanowitz, Donald F. Hunt, Benjamin A. Garcia, Ben E. Black, Lars E.T. Jansen

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Chromatin featuring the H3 variant CENP-A at the centromere is critical for its mitotic function and epigenetic maintenance. Assembly of centromeric chromatin is restricted to G1 phase through inhibitory action of Cdk1/2 kinases in other phases of the cell cycle. Here, we identify the two key targets sufficient to maintain cell-cycle control of CENP-A assembly. We uncovered a single phosphorylation site in the licensing factor M18BP1 and a cyclin A binding site in the CENP-A chaperone, HJURP, that mediated specific inhibitory phosphorylation. Simultaneous expression of mutant proteins lacking these residues results in complete uncoupling from the cell cycle. Consequently, CENP-A assembly is fully recapitulated under high Cdk activities, indistinguishable from G1 assembly. We find that Cdk-mediated inhibition is exerted by sequestering active factors away from the centromere. Finally, we show that displacement of M18BP1 from the centromere is critical for the assembly mechanism of CENP-A.

Original languageEnglish
Pages (from-to)231-246
Number of pages16
JournalMolecular cell
Volume65
Issue number2
DOIs
StatePublished - Jan 19 2017

Keywords

  • CENP-A
  • cell cycle
  • centromere
  • chromatin
  • cyclin dependent kinase
  • epigenetics
  • histone variant
  • kinetochore
  • mitosis

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