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This gene encodes the basic form of complement factor 4, part of the classical activation pathway. The protein is expressed as a single chain precursor which is proteolytically cleaved into a trimer of alpha, beta, and gamma chains prior to secretion. The trimer provides a surface for interaction between the antigen-antibody complex and other complement components. The alpha chain may be cleaved to release C4 anaphylatoxin, a mediator of local inflammation. Deficiency of this protein is associated with systemic lupus erythematosus. This gene localizes to the major histocompatibility complex (MHC) class III region on chromosome 6. Varying haplotypes of this gene cluster exist, such that individuals may have 1, 2, or 3 copies of this gene. In addition, this gene exists as a long form and a short form due to the presence or absence of a 6.4 kb endogenous HERV-K retrovirus in intron 9. This GeneID and its associated RefSeq record represent a second copy of C4B found on ALT_REF_LOCI_7. [provided by RefSeq, Jul 2011]
The information on this page was collected from publicly accessible databases, and is periodically updated. Promega makes no claims to accuracy, or ownership of these genes.
Gene products are often involved in multiple pathways and networks within a living cell. Learn more about other interacting partners.
Paste a protein or nucleic acid sequence in the box below to confirm that it matches this gene’s reference sequence(s). Click on a link under RELATED ORF CLONES to see how a sequence matches to an experimentally-validated ORF clone.
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