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A new tissue kallikrein-like protease, blarinasin, has been purified from the salivary glands of the short-tailed shrew  Blarina brevicauda . Blarinasin is a 32-kDa N-glycosylated protease with isoelectric values ranging between 5.3 and 5.7, and an optimum pH of 8.5 for enzyme activity. The cloned blarinasin cDNA coded for a pre-pro-sequence and a mature peptide of 252 amino acids with a catalytic triad typical for serine proteases and 43.7–54.0% identity to other mammalian tissue kallikreins. Blarinasin preferentially hydrolysed Pro-Phe-Arg-4-methylcoumaryl-7-amide (MCA) and N- tert -butyloxycarbonyl-Val-Leu-Lys-MCA, and preferentially converted human high-molecular-weight kininogen (HK) to bradykinin. The activity of blarinasin was prominently inhibited by aprotinin ( K  i =3.4 nM). A similar kallikrein-like protease, the lethal venom blarina toxin, has previously been purified from the salivary glands of the shrew  Blarina  and shows 67.9% identity to blarinasin. However, blarinasin was not toxic in mice. Blarinasin is a very abundant kallikrein-like protease and represents 70–75% of kallikrein-like enzymes in the salivary gland of  B. brevicauda .

biological chemistry

Purification and characterisation of blarinasin, a new tissue kallikrein-like protease from the short-tailed shrew  Blarina brevicauda : comparative studies with blarina toxin