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Heterochromatin Protein 1 (HP1) is a conserved component of the highly compact chromatin found at centromeres and telomeres. A conserved feature of the protein is multiple phosphorylation. Hyper-phosphorylation of HP1 accompanies the assembly of cytologically distinct heterochromatin during early embryogenesis. Hypo-phosphorylated HP1 is associated with the DNA-binding activities of the origin recognition...
We have used the highly conserved heterochromatin component, heterochromatin protein 1 (HP1), as a molecular tag for purifying other protein components of Drosophila heterochromatin. A complex of HP1 associated with the origin recognition complex (ORC) and an HP1/ORC-associated protein (HOAP) was purified from the maternally loaded cytoplasm of early Drosophila embryo. We propose that the DNA-binding...
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