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Nat Cell Biol. 2010 Jul;12(7):719-27. doi: 10.1038/ncb2075. Epub 2010 Jun 20.

Human POGZ modulates dissociation of HP1alpha from mitotic chromosome arms through Aurora B activation.

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1
Graduate School of Life Science, Hokkaido University, Sapporo 001-0021, Japan.

Abstract

Heterochromatin protein 1 (HP1) has an essential role in heterochromatin formation and mitotic progression through its interaction with various proteins. We have identified a unique HP1alpha-binding protein, POGZ (pogo transposable element-derived protein with zinc finger domain), using an advanced proteomics approach. Proteins generally interact with HP1 through a PxVxL (where x is any amino-acid residue) motif; however, POGZ was found to bind to HP1alpha through a zinc-finger-like motif. Binding by POGZ, mediated through its zinc-finger-like motif, competed with PxVxL proteins and destabilized the HP1alpha-chromatin interaction. Depletion experiments confirmed that the POGZ HP1-binding domain is essential for normal mitotic progression and dissociation of HP1alpha from mitotic chromosome arms. Furthermore, POGZ is required for the correct activation and dissociation of Aurora B kinase from chromosome arms during M phase. These results reveal POGZ as an essential protein that links HP1alpha dissociation with Aurora B kinase activation during mitosis.

PMID:
20562864
DOI:
10.1038/ncb2075
[Indexed for MEDLINE]

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