Nucleosomes structure and its dynamic transitions

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Abstract
The discovery of nucleosomes as a basic repeating unit of the chromatin structure organizing the major part of eukaryotic DNA greatly catalyzes the expansion of our knowledge on chromatin. Several lines of experimental evidence have led to the formulation of the nucleosome conception: the observation of chains of globular particles in electron micrographs of chromatin (Olins & Olins, 1974); the demonstration that DNA is released as a set of discrete sizes upon digestion of chromatin with endogenous nucleases (Hewish & Burgoyne, 1973); the isolation of discrete nucleoprotein particles upon digestion of chromatin with micrococcal nuclease (Rill & Van Holde, 1973).