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activated MASP-2 associated with MBL or ficolin
cleaves C4 to C4a and C4b
C4b
binds to microbial surface
C4b binds to C2
__________, which is then c leaved by MASP-2 to C2a
C4b2a
active C3 convertase of lectin pathway
C3a and C3b
C4b2a cleaves C3 into _______________
C3b
binds to microbial surface covalently
MBL monomers
form trimeric clusters of carbohydrate recognition domains
mannose and fucose residues
MBL binds with high avidity to
different domain
ficolins are similiar in structure to MBL, but have a
oligosaccharides
ficolins bind to
MASP 1/2/3
are associated serine proteases that initiate the complement cascade
lectin pathway
recognies differences in carbohydrate side chains on glycoproteins