Definition of Histone Proteins

Histone proteins are defined as the collection of proteins that are involved in the formation of nucleosome structure of the eukaryotic chromatin. Histones are highly basic in nature and are found inside the nucleus of the eukaryotic cell. These histones are responsible for packing and ordering the DNA in the form of structural units which are termed as nucleosomes.


The amino acid residues like arginine and lysine are present in abundance in these histones. The DNA coils around these histones and hence, the length of the DNA is reduced in this way. Take an example of a diploid cell of a human which has 1.8m long DNA in it but when it is coiled on the histones, the chromatin is formed which is only 90 micrometres in size.


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