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Transmembrane activator and CAML interactor
from Wikipedia
TNFRSF13B
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesTNFRSF13B, CD267, CVID, CVID2, RYZN, TACI, TNFRSF14B, IGAD2, tumor necrosis factor receptor superfamily member 13B, TNF receptor superfamily member 13B
External IDsOMIM: 604907; MGI: 1889411; HomoloGene: 49320; GeneCards: TNFRSF13B; OMA:TNFRSF13B - orthologs
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_012452

NM_021349

RefSeq (protein)

NP_036584

NP_067324

Location (UCSC)Chr 17: 16.93 – 16.97 MbChr 11: 61.02 – 61.04 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Transmembrane activator and CAML interactor (TACI), also known as tumor necrosis factor receptor superfamily member 13B (TNFRSF13B) is a protein that in humans is encoded by the TNFRSF13B gene.

TNFRSF13B is a transmembrane protein of the TNF receptor superfamily found predominantly on the surface of B cells, which are an important part of the immune system.[5] TACI recognizes three ligands: APRIL, BAFF and CAML.

Function

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TACI is a lymphocyte-specific member of the tumor necrosis factor (TNF) receptor superfamily. It was originally discovered because of its ability to interact with calcium-modulator and cyclophilin ligand (CAML). TACI was later found to play a crucial role in humoral immunity by interacting with two members of the TNF family: B-cell activating factor (BAFF) and a proliferation-inducing ligand (APRIL).[6] These proteins signal through TACI inducing activation of several transcription factors including NFAT, AP-1, and NF-kappa-B which then modulate cellular activities. Defects in the function of TACI can lead to immune system diseases and has shown to cause fatal autoimmunity in mice.[7]

TACI controls T cell-independent B cell antibody responses, isotype switching, and B cell homeostasis.[citation needed]

Clinical significance

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TACI mutations are associated with immunodeficiency in humans, as a significant proportion of common variable immunodeficiency (CVID) patients have TACI mutations.[citation needed] People with this condition produce abnormally low amounts of antibodies, which are needed for protection against infections.

In humans, the gene encoding this protein is located within the Smith–Magenis syndrome region on chromosome 17.[5]

TACI is currently being targeted for autoimmunity and B cell malignancies via atacicept, a recombinant fusion protein that binds the TACI ligands BAFF and APRIL.[8]

Interactions

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References

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Further reading

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