Entrez Summary: 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 which 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. Polymorphisms in this gene are associated with a reduced risk of age-related macular degeneration. The polyadenylation site of this gene is 421 bp from the 5' end of the gene for complement component 2. [provided by RefSeq, Jul 2008].
UniProt Summary: N/A
Pfam DomainsGO Terms
Pfam Domains
Sushi
Trypsin
VWA
GO Terms
complement binding
complement activation, alternative pathway
regulation of complement activation
regulation of humoral immune response
blood microparticle
serine-type endopeptidase activity
complement activation
humoral immune response
regulation of immune effector process
activation of immune response
innate immune response
positive regulation of immune response
defense response to other organism
immune effector process
positive regulation of immune system process
regulation of immune response
proteolysis
response to other organism
response to external biotic stimulus
response to biotic stimulus
defense response
extracellular space
regulation of immune system process
immune response
extracellular region
CRISPR Data
Compound HitMost Correlated Genes in ChemogenomicsTissues where Essential in the Avana Dataset (DepMap 20Q1)
Compound Hit
No hits were found.
Most Correlated Genes in Chemogenomics
No correlation found to any other genes in chemogenomics.
Tissues where Essential in the Avana Dataset (DepMap 20Q1)
Global Fraction of Cell Lines Where Essential: 1/739