Protamines are small, arginine-rich, nuclear proteins that replace histones late in the haploid phase of spermatogenesis and are believed essential for sperm head condensation and DNA stabilization. They may allow for denser packaging of DNA in spermatozoon than histones, but they must be decompressed before the genetic data can be used for protei
Found on http://en.wikipedia.org/wiki/Protamine
- a simple protein found in fish sperm
Found on http://www.webdictionary.co.uk/definition.php?query=protamine
Highly basic (arginine-rich) protein that replaces histone in sperm heads, enabling DNA to pack in an extremely compacted form, eg. clupein, iridin (4 kD). See also transition proteins.
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Highly basic (arginine rich) protein that replaces histone in sperm heads, enabling DNA to pack in an extremely compacted form, for example clupein, iridin (4K). ... See: transition proteins. ... (18 Nov 1997) ...
Found on http://www.mondofacto.com/facts/dictionary?protamine
a simple protein found in fish sperm; rich in arginine; simpler in composition than globulin or albumin; counteracts the anticoagulant effect of heparin
Found on http://wordnetweb.princeton.edu/perl/webwn?s=protamine
(pro´tә-mēn) any of a class of simple proteins, soluble in water, not coagulated by heat, and precipitated from aqueous solution by addition of alcohol. Protamines neutralize heparin, and protamine sulfate is used as an antidote in heparin overdosage, administered intravenously.
Found on http://www.encyclo.co.uk/local/21001
simple alkaline protein usually occurring in combination with a nucleic acid as a nucleoprotein. In the 1870s Johann Friedrich Miescher discovered a ... [3 related articles]
Found on http://www.britannica.com/eb/a-z/p/122
Type: Term Pronunciation: prō′tă-mēn, -min Definitions: 1. Any of a class of proteins, highly basic because rich in l-arginine and simpler in constitution than the albumins and globulins, etc., found in fish spermatozoa in combination with nucleic acid; the protamines have a histonelike function and are present in mammalian spe
Found on http://www.medilexicon.com/medicaldictionary.php?t=72920
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