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The classical and alternative complement pathways. Complement-pathways. C3 convertase (C4bC2b, formerly C4b2a) belongs to family of serine proteases and is necessary in innate immunity as a part of the complement system which eventuate in opsonisation of particles, release of inflammatory peptides, C5 convertase formation and cell lysis.
12266 Ensembl ENSG00000125730 ENSMUSG00000024164 UniProt P01024 P01027 RefSeq (mRNA) NM_000064 NM_009778 RefSeq (protein) NP_000055 NP_033908 Location (UCSC) Chr 19: 6.68 – 6.73 Mb Chr 17: 57.51 – 57.54 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Complement component 3, often simply called C3, is a protein of the immune system that is found primarily in the blood. It plays a ...
Bb remains bound to C3(H 2 O) to form C3(H 2 O)Bb. This complex is also known as a fluid-phase C3-convertase. This convertase, the alternative pathway C3-convertase, although only produced in small amounts, can cleave multiple C3 proteins into C3a and C3b. The complex is believed to be unstable until it binds properdin, a serum protein. The ...
C2b diffuses into the plasma as a protein inflammatory mediator while C2a remains attached with C4b, forming the C3-convertase (C4b2a). The function of the membrane-bound C3-convertase is the cleavage of many many molecules of C3 into C3a and C3b. C3a is a smaller fragment of C3 is a potent inflammatory mediator.
The term C3 convertase may refer to: C3-convertase, an enzyme; Alternative-complement-pathway C3/C5 convertase, an enzyme This page was last edited on 24 January 2021 ...
Cleavage of Arg-Ser bond in complement component C3 alpha-chain to yield C3a and C3b, and Arg- bond in complement component C5 alpha-chain to yield C5a and C5b This enzyme is a bimolecular complex of complement fragment Bb with either C3b or cobra venom factor.
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This C3bBb convertase is stabilized by properdin (Factor P) preferentially on microbial surfaces over normal host surfaces, and is now able to cleave many more C3 molecules thus amplifying the signal. [1] Incorporation of an additional C3b into the C3bBb C3 convertase leads to the formation of C3Bb3b C5 convertase. [3]