Licensing of Centromeric Chromatin Assembly through the Mis18?-Mis18? Heterotetramer.

ABSTRACT: Centromeres are specialized chromatin domains specified by the centromere-specific CENP-A nucleosome. The stable inheritance of vertebrate centromeres is an epigenetic process requiring deposition of new CENP-A nucleosomes by HJURP. We show HJURP is recruited to centromeres through a direct interaction between the HJURP centromere targeting domain and the Mis18?-? C-terminal coiled-coil domains. We demonstrate Mis18? and Mis18? form a heterotetramer through their C-terminal coiled-coil domains. Mis18?-? heterotetramer formation is required for Mis18BP1 binding and centromere recognition. S. pombe contains a single Mis18 isoform that forms a homotetramer, showing tetrameric Mis18 is conserved from fission yeast to humans. HJURP binding disrupts the Mis18?-? heterotetramer and removes Mis18? from centromeres. We propose stable binding of Mis18 to centromeres in telophase licenses them for CENP-A deposition. Binding of HJURP deposits CENP-A at centromeres and facilitates the removal of Mis18, restricting CENP-A deposition to a single event per cell cycle.

SUBMITTER: Nardi IK 

PROVIDER: S-EPMC4935545 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature