title: A high molecular weight nuclear basic protein from the bivalve mollusc Spisula solidissima.
abstract: A basic protein has been isolated from sperm of the bivalve Spisula solidissima. Its characteristics are reminiscent of both histone H1 and of fish protamines. It is unusual in several respects: it contains similar amounts of lysine (24.8%) and arginine (23.1%), plus a residue of tryptophan per molecule. Its size is very large, approximately 297 amino acid residues. It shows a tendency to aggregate, an unusual property given the strongly charged nature of this protein.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000818:Animals; D049872:Bivalvia; D006657:Histones / Q000302:isolation & purification; D008297:Male; D008970:Molecular Weight; D009698:Nucleoproteins / Q000302:isolation & purification*; D011479:Protamines / Q000302:isolation & purification; D011487:Protein Conformation; D013094:Spermatozoa / Q000032:analysis*
chemical_list: D000596:Amino Acids; D006657:Histones; D009698:Nucleoproteins; D011479:Protamines