what is the chemical composition of a nucleosome

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The nucleosome was proposed to be composed of aH3-H4 tetramer and two dimers of H2A-H2B(Richmond et al., 1984;Arents et al., 1991;Arents and Moudrianakis, 1993;Luger et al., 1997).

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Each nucleosome consists of histone octamer core, assembled from the histones H2A, H2B, H3 and H4 (or other histone variants in some cases) and a segment of DNA that wraps around the histone core. Adjacent nucleosomes are connected via 鈥渓inker DNA鈥? The nucleosome is the smallest structural component of chromatin, …

The nucleosome structure consists of DNA and a histone protein complex. One strand of DNA is coiled around one core histone octamer to create a histone nucleosome. Each core histone octamer is comprised of two copies of four core histone proteins for a total of 8 proteins in all:

DNA Stretching in the Nucleosome The original 2.8 crystal structure of the nucleosome core particle contained 146 bp of symmetrized human alpha satellite DNA. Since the nucleosomal dyad lies on a base pair, there was necessarily 73 bp on one side of the dyad base pair and 72 bp on the other side.

the nucleosome core particle. This has fundamental DNA repair and recombination. Chromatin can both regulation. Eukaryotic cells have developed elaborate structures in a regulated manner. ). The protein core itself is composed of two