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The distribution of trypsin between the protease inhibitors of human serum with and without Trasylol was studied in vitro. 1) Trypsin was preferentially bound by alpha2-macroglobulin on addition of small amounts of the enzyme to normal serum in both the presence and absence of Trasylol in a molar concentration equal to that of alpha2-macroglobulin. 2) On saturation of alpha2-macroglobulin, a considerable amount of trypsin was bound by Trasylol even when most of the serum alpha1-antitrypsin was in a free form. 3) In reaction mixtures containing small amounts of trypsin, Trasylol was identified in a free form as well as in complex with trypsin-alpha2-macroglobulin complex and to a limited extent with trypsin. 4) With larger amounts of trypsin, sufficient to saturate alpha2-macroglobulin, increasing amounts of Trasylol were bound to trypsin. The relative amount of Trasylol bound to trypsin-alpha2-macroglobulin complexes was now smaller. This was explained by a higher affinity (or binding rate) of Trasylol for trypsin than for trypsin-alpha2-macroglobulin complexes. 5) Trypsin-Trasylol complexes showed no signs of dissociation after 5 h incubation at 37 degrees C in serum.

Studies on the Influence of Trasylol on the Partition of Trypsin between the Human Plasma Protease Inhibitors in vitro