Abstract
Only two basic proteins are present in the chromatin of the sperm cells of the marine worm Chaetopterus variopedatus. They have distinctive electrophoretic mobilities on acetic acid-urea polyacrylamide. The two molecules have been purified by CM-cellulose column chromatography and their amino acid compositions determined. One component is a very lysine-rich H1 histone with M r 22 000 as determined by SDS gel electrophoresis and from minimal amino acid composition. It shows a Lys/Arg ratio of about 2, typical of sea urchin sperm H1 histones. The other component is a protamine with high arginine and lysine content and minimal M r 5600 as derived from amino acid composition. The H1 and the protamine are contained in the chromatin in a mass ratio of about 1:2.
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