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The complement pathway is an important host defense system that contributes to both innate and acquired immunity. There are three pathways of complement activation: the classical pathway, lectin pathway and alternative pathway. Complement protein Factor I is a key serine protease that modulates the complement cascade by regulating the levels of C3 convertases. It circulates in plasma as a heavily N-glycosylated heterodimer made up of two disulfide linked chains, each carrying three N-linked oligosaccharide chains that may have both structural and functional roles in the interactions with the natural substrate and the cofactor during catalysis. Factor I is a serine protease with a high degree of specificity for C3b and C4b. It requires protein cofactors for cleavage of these complement proteins; Factor H, CR1 or MCP are required for C3b cleavage, and C4bp or CR1 are required for C4b cleavage.
仅用于科研。不用于诊断过程。未经明确授权不得转售。
蛋白别名: C3b-inactivator; C3B/C4B inactivator; CFI; complement component I; complement control protein factor I; Complement factor I; complement factor I heavy chain; Konglutinogen-activating factor; light chain of factor I; prepro-C3b/C4B inactivator; unnamed protein product
基因别名: AHUS3; ARMD13; C3b-INA; C3BINA; CFI; FI; IF; KAF
UniProt ID: (Human) P05156, (Mouse) Q61129, (Rat) Q9WUW3
Entrez Gene ID: (Human) 3426, (Mouse) 12630, (Rat) 79126