The
(Fab)2 fragment can -
•Detect
antigen
•Precipitate antigen
•Block the active sites of toxins or pathogen-associated molecules
•Block interactions between host and pathogen-
associated molecules
but
can not activate
•Inflammatory
and effector functions associated with cells
•Inflammatory
and effector functions of complement
•The
trafficking of antigens into the antigen processing
pathways
Fc structure is common to all
specificities of antibody within an ISOTYPE
(although there are allotypes)
The structure acts as a receptor
for complement proteins and a ligand for cellular binding sites
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