| proactivator | <biochemistry> A substance that, when chemically split, yields a fragment (activator) capable of rendering another substance enzymatically active. (05 Mar 2000) |
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| C3 proactivator | <enzyme> A glycine-rich, heat-labile beta-glycoprotein found in blood. It is a proactivator of complement 3 in the alternate pathway of complement activation. Factor b is converted by factor d to c3 convertase. Registry number: EC 3.4.21.47 (12 Dec 1998) |
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| C3 proactivator convertase | <enzyme> A serum protein which during the alternate pathway of complement activation converts the inactive properdin factor b to c3 convertase. Registry number: EC 3.4.21.46 (12 Dec 1998) |