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. 1991 Nov 15;280(Pt 1):19–25. doi: 10.1042/bj2800019

T-kininogenase activity of the rat submandibular gland is predominantly due to the kallikrein-like serine protease antigen gamma.

T Berg 1, I Wassdal 1, T Mindroiu 1, K Sletten 1, G Scicli 1, O A Carretero 1, A G Scicli 1
PMCID: PMC1130593  PMID: 1741746

Abstract

T-kininogen, the major kininogen in rat plasma, releases Ile-Ser-bradykinin (T-kinin) when incubated with trypsin, but is not a substrate for tissue kallikrein. Enzymes able to release T-kinins from T-kininogen have been found in the rat submandibular gland, but precise identification of these enzymes and their possible relationship to kallikrein-like enzymes has not been established. We studied T-kininogenase activity in fractionated submandibular gland homogenate. The main T-kininogen catalytic enzyme was purified and characterized, and found to be identical to antigen gamma, a kallikrein-like enzyme which we have previously characterized. Of other identified kallikrein-like enzymes only tonin showed weak T-kininogenase activity, which was about 0.25% of that of antigen gamma. No other T-kininogen catalytic enzymes were observed. Antigen gamma released a kinin which was identified as T-kinin by reverse-phase h.p.l.c. The T-kininogenase activity of antigen gamma had a Km of 29 +/- 4 microM and a kcat/Km of 140 M-1.s-1, and was comparable with its high and low molecular mass-kininogenase activity (7.4 and 10 micrograms of kinin/h per mg respectively). In contrast, tissue kallikrein released 0.2 and 42,200 micrograms of kinin/h per mg respectively. Thus antigen gamma is a weak kininogenase. The isoelectric point of antigen gamma, but not its molecular mass, differed from that of other kallikrein-like enzymes. Isoelectrofocusing in flat-bed gels combined with immunostaining was therefore a convenient method for identification. The kallikrein-like nature of antigen gamma was demonstrated by its immunological similarity to tissue kallikrein and tonin and by 91% and 87% amino acid sequence similarity with tonin and kallikrein respectively (67 amino acids sequenced). Complete identity was also not observed with other sequenced kallikrein genes, mRNAs or proteins.

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