C3 convease acts on -

C3 convease splits split C3 into two fragments : C3a which is an anaphylatoxin and C3b which remains cell bound along with C4b2a to form a trimolecular complex C4b2a3b which has enzymatic activity and is called C5 convease. Reference : Anathanarayan & paniker's 9th edition, pg no: 122 <\p>