nucleosome
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nucleosome |
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| navigate by keyword : compact spool tight acetylation unit cellular activation life eight lecture phenotype expression wrap physiological peptide polypeptide mutation laboratory histones nucleolus methyl chemistry suppress biochemistry macromolecule deoxyribonucleic chromosomes dna molecule biological microscopic anatomy scientific cell genetics h2a h2b nucleus biotechnology epigenetic pack methylation nucleotide tail microbiology regulation infographic education genome diagram structure chromatin evolution medicine health spiral chromosome genetic human molecular histone nucleosome science sequence double gene biology model protein helix medical proteins vector research |
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| A nucleosome is the basic structural unit of chromatin, the complex of DNA and proteins that makes up chromosomes within the nucleus of eukaryotic cells. It consists of a segment of DNA wound around a core of histone proteins.The core of the nucleosome is composed of eight histone proteins: two copies each of histones H2A, H2B, H3, and H4. The DNA is wrapped around this histone core in about 1.65 turns in a left-handed superhelix, forming a structure resembling beads on a string. |
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