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 (prō′tə-mēn′, -mĭn) also pro·ta·min (-mĭn)
Any of a group of arginine-rich proteins that bind to and package DNA in the sperm nucleus. Protamines are used in long-acting formulations of insulin and to neutralize the anticoagulant effects of heparin.


(Biochemistry) any of a group of basic simple proteins that occur, in association with nucleic acids, in the sperm of some fish
[C19: from German: see proto-, amine]


(ˈproʊ təˌmin, prɒˈtæm ɪn)

any of a group of arginine-rich, strongly basic proteins that are not coagulated by heat.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.protamine - a simple protein found in fish sperm; rich in arginine; simpler in composition than globulin or albumin; counteracts the anticoagulant effect of heparin
simple protein - a protein that yields only amino acids when hydrolyzed