why histone protein bind to DNA to form nucleosome
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Due to negative charge of DNA it binds to histone proteins which are positively chardged.
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The nucleosome core particle consists of approximately 146 base pairs (bp) of DNA wrapped in 1.67 left-handed superhelical turns around a histone octamer consisting of 2 copies each of the core histones H2A, H2B, H3, and H4. Core particles are connected by stretches of "linker DNA", which can be up to about 80 bp long.
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