title: Acidic cysteine proteinase inhibitor in seminal plasma.
abstract: A cysteine proteinase inhibitor with acidic isoelectric point (pI = 4.7-5.0) was found in human seminal plasma. Its apparent molecular mass is 16 kDa. It inhibits cysteine proteinases like ficin, cathepsin H, cathepsin B and papain. The inhibitory activity of seminal plasma against ficin is almost the same as that of human serum.
mesh_terms: D015853:Cysteine Proteinase Inhibitors; D006358:Hot Temperature; D006801:Humans; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007525:Isoelectric Focusing; D008297:Male; D008970:Molecular Weight; D011506:Proteins / Q000032:analysis*; D012661:Semen / Q000032:analysis*; D014357:Trypsin
chemical_list: D015853:Cysteine Proteinase Inhibitors; D011506:Proteins; D014357:Trypsin