Concanavaiin A interacts specifically with the oligosaccharides from protei
n-C and modifies its anticoagulant activity. The lectin activates the prote
in-C activity in a dose dependent manner as demonstrated by in vitro and in
vivo assays. Concanavalin A at low concentration (0.1 to 2 mu g/ml) induce
s an increase on the catalytic activity of protein-C; at higher concentrati
ons (5 to 20 mu g/mL), the catalytic activity returns to the baseline. The
effect of concanavalin A was prevented by incubating the protein-C with alp
ha-methyl-mannoside or by treating the purified protein-C with alpha-mannos
idase; furthermore, cleavage of mannosidic residues diminishes its catalyti
c activity. Our results indicate that the oligomannosidic portion of protei
n-C participates in the regulation of the catalytic activity of this protei
n.