Friday, November 23, 2012

Nucleosome


Nucleosome is considered the packaging unit of chromatin, its formed by the winding of DNA around four proteins designated Histones ( proteins essentially constituted by lysine and arginine that help in the winding of the DNA), this four proteins are H2A, H2B, H3 and H4.
Chromatin involves the histones in regular intervals, in other words, a nucleosome is formed every 200 base pairs, and around 56 nucleotides involve the histones, which means there are approximately 146 base pairs between each nucleosome.


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