Modulation of the activity of the classical complement pathway C3 convertase by surface-bound C3 or C5.
D003166:Complement Activating Enzymes / Q000276:immunology*; D003167:Complement Activation; D003176:Complement C3 / Q000037:antagonists & inhibitors / Q000276:immunology*; D050577:Complement C3-C5 Convertases / Q000276:immunology*; D003182:Complement C5 / Q000276:immunology*; D003171:Complement Pathway, Classical; D006801:Humans; D011951:Receptors, Complement / Q000276:immunology
D003176:Complement C3; D003182:Complement C5; D011951:Receptors, Complement; D003166:Complement Activating Enzymes; D050577:Complement C3-C5 Convertases