Alternative-complement-pathway C3/C5 convertase (EC 3.4.21.47, "complement component C3/C5 convertase (alternative)", "proenzyme factor B", "properdin factor B", "C3 proactivator", "glycine-rich beta-glycoprotein", "heat-labile factor", "C3 convertase", "C3b,Bb,CVF,Bb,C5 convertase", "(C3b)n,Bb", "complement C 3(C 5) convertase (amplification)", "alternative complement pathway C3(C5) convertase", "C5 convertase", "CVF,Bb", "(CVF)-dependent glycine-rich-beta-glucoprotein", "cobra venom factor-dependent C3 convertase") is an enzyme. This enzyme catalyses the following chemical reaction
 Cleavage of Arg-Ser bond in complement component C3 alpha-chain to yield C3a and C3b, and Arg- bond in complement component C5 alpha-chain to yield C5a and C5b
This enzyme is a bimolecular complex of complement fragment Bb with either C3b or cobra venom factor.
References.
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