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  • Title: Kunitz-type proteinase inhibitors derived by limited proteolysis of the inter-alpha-trypsin inhibitor, I. Determination of the amino acid sequence of the antitryptic domain by solid-phase Edman degradation.
    Author: Hochstrasser K, Wachter E.
    Journal: Hoppe Seylers Z Physiol Chem; 1979 Sep; 360(9):1285-96. PubMed ID: 92447.
    Abstract:
    The acid-stable trypsin inhibitor of human serum and urine is released in vivo by limited proteolysis from the high molecular weight, acid-labile inter-alpha-trypsin inhibitor. When complexed with trypsin, both this acid-stable, active derivative and the inter-alpha-trypsin inhibitor can be degraded in vitro by prolonged digestion with trypsin to a low molecular weight "minimal" inhibitor. This minimal trypsin inhibitor was sequenced and found to be homologous to the known Kunitz-type inhibitors (e.g. the basic trypsin-kallikrein inhibitor from bovine organs). This indicates that the antitryptic activity of the big inter-alpha-trypsin inhibitor is due to a Kunitz-type domain.
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