Abstract
Basic arginine esterase (amidase) with a specific activity of 3.2 mumol N-alpha-tosyl-L-arginine methyl ester (Tos-Arg-Me) esterolysis per A280 was purified about 230-fold from a CM-cellulose absorbed preparation of human seminal plasma. The purified enzyme was a single band with an apparent molecular weight of 3.4-4.1 x 10(4). The amidolytic activity of this enzyme was suppressed by aprotinin, soybean trypsin inhibitor (SBTI), leupeptin, and antipain, while alpha 1-antitrypsin, ovomucoid trypsin inhibitor (OTI), EDTA, and chymostatin had no or weak effect. This enzyme hydrolyzed synthetic basic amino acid derivatives and N-alpha-tosyl-glycyl-L-prolyl-arginine-p-nitroanilide (Tos-Gly-Pro-Arg-pNA) and N-alpha-tert-butyloxycarbonyl-L-leucyl-L-prolyl-L-arginine-p-nitroanilid e (Boc-Leu-Pro-Arg-pNA) were the best substrates. The enzymatic characteristics of present enzyme were clearly different from tissue kallikrein, acrosin, and seminin in human semen.
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