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EMBO Rep. 2016 Apr;17(4):496-507. doi: 10.15252/embr.201541520. Epub 2016 Feb 26.

Centromere localization and function of Mis18 requires Yippee-like domain-mediated oligomerization.

Author information

1
Wellcome Trust Centre for Cell Biology, Institute of Cell Biology, University of Edinburgh, Edinburgh, UK.
2
Wellcome Trust Centre for Cell Biology, Institute of Cell Biology, University of Edinburgh, Edinburgh, UK jeyaprakash.arulanandam@ed.ac.uk.

Abstract

Mis18 is a key regulator responsible for the centromere localization of the CENP-A chaperone Scm3 in Schizosaccharomyces pombe and HJURP in humans, which establishes CENP-A chromatin that defines centromeres. The molecular and structural determinants of Mis18 centromere targeting remain elusive. Here, by combining structural, biochemical, and yeast genetic studies, we show that the oligomerization of S. pombe Mis18, mediated via its conserved N-terminal Yippee-like domain, is crucial for its centromere localization and function. The crystal structure of the N-terminal Yippee-like domain reveals a fold containing a cradle-shaped pocket that is implicated in protein/nucleic acid binding, which we show is required for Mis18 function. While the N-terminal Yippee-like domain forms a homodimer in vitro and in vivo, full-length Mis18, including the C-terminal α-helical domain, forms a homotetramer in vitro We also show that the Yippee-like domains of human Mis18α/Mis18β interact to form a heterodimer, implying a conserved structural theme for Mis18 regulation.

KEYWORDS:

CENP‐A; Mis18; Yippee; centromere; epigenetics

PMID:
26921242
PMCID:
PMC4818781
DOI:
10.15252/embr.201541520
[Indexed for MEDLINE]
Free PMC Article

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