Nucleosome

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This is the structure of a nucleosome (Protein Data Bank structure 1P3I), determined by X-ray crystallography. A DNA double helix is wrapped twice around a cluster of 8 histone proteins.

Color scheme:

• Green + yellow = DNA
• Proteins shown as red spacefilling atoms, except...
• Positively charged amino acids (lysine + arginine) shown in blue.

© by D. Eric Walters

This is the structure of a nucleosome (Protein Data Bank structure 1P3I), determined by X-ray crystallography. A DNA double helix is wrapped twice around a cluster of 8 histone proteins.

Color scheme:

• Green + yellow = DNA
• Proteins shown as red spacefilling atoms, except...
• Positively charged amino acids (lysine + arginine) shown in blue.

© by D. Eric Walters