title: Isolation and characterization of two protamines St1 and St2 from stallion spermatozoa, and amino-acid sequence of the major protamine St1.
abstract: Two protamines, St1 and St2, were isolated from stallion sperm nuclei, where they represent about 75 and 25%, respectively, of the total basic protein complement. The primary structure of protamine St1 (49 residues; Mr approximately equal to 6600) has been determined. The structure of this protamine is compared to the amino-acid sequence of other mammalian protamines already known.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D006736:Horses / Q000378:metabolism*; D008297:Male; D011479:Protamines / Q000302:isolation & purification*; D013094:Spermatozoa / Q000032:analysis*
chemical_list: D011479:Protamines; C052908:protamine St1