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What substances can activate the LECTIN pathway of complement
Carbohydrates on microbial cell walls
lectins, ficolins, CL-L1
Mannan-binding lectin (MBL)
Lectin Pathway of Complement
Step 1
MASP-2 binds to mannose (sugar) on bacterial cell wall…cleaves C4 & C2 to form C4bC2a (C3 convertase)
Lectin Pathway of Complement
Step 2
C3 convertase cleaves C3 to form C4bC2aC3b (C5 convertase)
Lectin Pathway of Complement
Step 3
C5 convertase cleaves C5…C5b inserts itself into cell membra
Lectin Pathway of Complement
Step 4
C5b attracts C6, C7, C8, & C9 to form the MAC