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Isolation of the Chromocenter Fraction from Mouse Liver Nuclei

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Abstract

A new method for isolation of the constitutive heterochromatin (chromocenters) from interphase nuclei of mouse liver has been developed. This method allows separation of chromocenters of different size. Chromocenter fractions are essentially free of nucleoli and other contaminants. In contrast to nuclei and nucleoli, the chromocenter fraction is characterized by simpler protein composition, this fraction having a reduced number of proteins (especially high molecular weight proteins). Chromocenters contain all histone fractions; however, the relative proportion of histone H1 is lower and histone H3 is higher than in the total nuclear chromatin. The amount of non-histone proteins of 51, 63, 73, and 180 kD is higher in the chromocenter fraction than in nuclei and nucleoli. The use of immunocytochemistry and immunoblotting methods revealed the presence of the specific kinetochore component, CENP A protein. This suggests tight association of some molecular kinetochore components with chromocenters in the interphase.

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Authors and Affiliations

  1. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia

    A. N. Prusov & O. V. Zatsepina

  2. Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow, 117997, Russia

    O. V. Zatsepina

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  1. A. N. Prusov
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  2. O. V. Zatsepina
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Correspondence to A. N. Prusov.

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Prusov, A.N., Zatsepina, O.V. Isolation of the Chromocenter Fraction from Mouse Liver Nuclei. Biochemistry (Moscow) 67, 423–431 (2002). https://doi.org/10.1023/A:1015229922183

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