The main action of lectin binding to carbohydrate is to activate plasma-associated proteases called mannose-binding lectin associated proteases (MASPs). These act on C4 and C2 in the same way as C1 esterase, and on C3 in much the same manner as C3 convertase. | The main action of lectin binding to carbohydrate is to activate plasma-associated proteases called mannose-binding lectin associated proteases (MASPs). These act on C4 and C2 in the same way as C1 esterase, and on C3 in much the same manner as C3 convertase. |