Info

Binding of antibodies to multivalent antigen; binding of C1 to antibodies

Binding of C4 to Ig-associated C1q

Cleavage of C4 by C1r2S2 enzyme; covalent attachment of C4b to antigenic surface and to antibodies

Binding of C2 to C4; cleavage of C2 to form C4b2b complex (C3 convertase)

Cleavage of C3 by C3 convertase

Binding of C3b to antigenic surface and to C4b2b complex i_i

Cleavage of C5; initiation of late steps of complement activation

convertase

convertase cir^^rn n

convertase

convertase

FIGURE 12-9 The classical pathway of complement activation. Antigen-antibody complexes that activate the classical pathway may be soluble, fixed on the surface of cells (as shown), or deposited on extracellular matrices. The classical pathway is initiated by the binding of C1 to antigen-complexed antibody molecules, which leads to the production of C3 and C5 convertases attached to the surfaces where the antibody was deposited. The C5 convertase cleaves C5 to begin the late steps of complement activation.

Was this article helpful?

0 0
How To Bolster Your Immune System

How To Bolster Your Immune System

All Natural Immune Boosters Proven To Fight Infection, Disease And More. Discover A Natural, Safe Effective Way To Boost Your Immune System Using Ingredients From Your Kitchen Cupboard. The only common sense, no holds barred guide to hit the market today no gimmicks, no pills, just old fashioned common sense remedies to cure colds, influenza, viral infections and more.

Get My Free Audio Book


Post a comment