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. 1995 May;15(5):2745–2753. doi: 10.1128/mcb.15.5.2745

DNA-binding and chromatin localization properties of CHD1.

D G Stokes 1, R P Perry 1
PMCID: PMC230505  PMID: 7739555

Abstract

CHD1 is a novel DNA-binding protein that contains both a chromatin organization modifier (chromo) domain and a helicase/ATPase domain. We show here that CHD1 preferentially binds to relatively long A.T tracts in double-stranded DNA via minor-groove interactions. Several CHD1-binding sites were found in a well-characterized nuclear-matrix attachment region, which is located adjacent to the intronic enhancer of the kappa immunoglobulin gene. The DNA-binding activity of CHD1 was localized to a 229-amino-acid segment in the C-terminal portion of the protein, which contains sequence motifs that have previously been implicated in the minor-groove binding of other proteins. We also demonstrate that CHD1 is a constituent of bulk chromatin and that it can be extracted from nuclei with 0.6 M NaCl or with 2 mM EDTA after mild digestion with micrococcal nuclease. In contrast to another chromo-domain protein, HP1, CHD1 is not preferentially located in condensed centromeric heterochromatin, even though centromeric DNA is highly enriched in (A+T)-rich tracts. Most interestingly, CHD1 is released into the cytoplasm when cells enter mitosis and is reincorporated into chromatin during telophase-cytokinesis. These observations lend credence to the idea that CHD1, like other proteins with chromo or helicase/ATPase domains, plays an important role in the determination of chromatin architecture.

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