Complement factor B

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Protein CFB PDB 1dle.png
Available structures
PDB Human UniProt search: PDBe RCSB
Aliases CFB, Cfb, AI195813, AI255840, B, Bf, C2, Fb, H2-Bf, AHUS4, ARMD14, BFD, CFAB, CFBD, FBI12, GBG, PBF2, complement factor B
External IDs HomoloGene: 1292 GeneCards: 629
Genetically Related Diseases
Disease Name References
macular degeneration
RNA expression pattern
PBB GE CFB 202357 s at tn.png

PBB GE CFB 211920 at tn.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr 6: 31.95 – 31.95 Mb n/a
PubMed search [2] n/a
View/Edit Human
Alternative pathway. (Some labels are in Polish.)

Complement factor B is a protein that in humans is encoded by the CFB gene.[1]

This gene encodes complement factor B, a component of the alternative pathway of complement activation. Factor B circulates in the blood as a single chain polypeptide. Upon activation of the alternative pathway, it is cleaved by complement factor D yielding the noncatalytic chain Ba and the catalytic subunit Bb. The active subunit Bb is a serine protease that associates with C3b to form the alternative pathway C3 convertase. Bb is involved in the proliferation of preactivated B lymphocytes, while Ba inhibits their proliferation. This gene localizes to the major histocompatibility complex (MHC) class III region on chromosome 6. This cluster includes several genes involved in regulation of the immune reaction. The polyadenylation site of this gene is 421 bp from the 5' end of the gene for complement component 2.[1]

Complement tests
C4 (C) FB (A) C3 CH50 Conditions
 · PSG, C3 NeF AA
 ·  · HA, C4D
 ·  ·  · TCPD
 · /↓ SLE


Further reading[edit]

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