Species: Hu, Mu, Gt, Pm, Sh
Applications: WB, Simple Western, DB, ELISA, Flow, ICC/IF, IHC, IP, CyTOF-ready
Host: Mouse Monoclonal
Species: Hu, Mu, Fe, Rb
Applications: WB, Flow, ICC/IF, IHC, IP, CyTOF-ready
Host: Mouse Monoclonal
Species: Hu, Mu, Rt, Bv
Applications: WB, ELISA, ICC/IF, IHC
Host: Rabbit Polyclonal
Species: Hu
Applications: PAGE
Species: Hu
Applications: AC
Description
CD81, also known as TAPA-1 and Tetraspanin-28, is an approximately 25 kDa palmitoylated component of plasma membrane lipid rafts (1). It contains four transmembrane segments, two extracellular loops of 30 and 90 amino acids (aa), and three short cytoplasmic regions (2, 3). Within the large extracellular loop, human CD81 shares 90% and 84% aa sequence identity with mouse and rat CD81, respectively. CD81 associates with a wide range of membrane proteins including CD151, TfR2, LDL R, PCSK9, Glypican 3, IFITM1, IGSF8/CD316, FPRP, and complexes of CD19-CD21 (4-11). It is required for the development of CD4+CD8+ DP thymocytes (12) and hepatocyte infection by Plasmodium sporozoites (13). It also supports B cell receptor signaling (11), Hepcidin expression (5), monocyte and B cell tethering to the vascular endothelium (14), and the immunosuppressive function of Treg and MDSC (15). CD81 additionally functions as a receptor for the E2 glycoprotein of hepatitis C virus (16). The CD81-E2 interaction inhibits NK cell cytolytic activity, provides a co-stimulatory signal to T cells, and inhibits the maturation of plasmacytoid dendritic cells (17-19).
Bioinformatics
| Uniprot |
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| Product By Gene ID |
975 |
| Alternate Names |
- CD81 antigen (target of antiproliferative 1)
- CD81 antigen
- CD81 molecule
- CD81
- CVID6
- TAPA1
- TAPA-1
- Target of the antiproliferative 1
- Tetraspanin-28
- TSPAN28
- Tspan-28
- tspan-28,26 kDa cell surface protein TAPA-1
- TSPAN28S5.7
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Related CD81 Blog Posts
Check out the latest blog posts on CD81.
Glypican 3 as a biomarker for gastro-esophageal adenocarcinoma
By Jamshed Arslan, Pharm. D., PhD. Gastroesophageal adenocarcinoma originates from the glandular epithelium of the esophagus, gastroesophageal junction and stomach. The incidence of gastroesophageal adenocarcinoma is ... Read more.
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Tools for Isolation, Quantification and Analysis of Exosomes
Exosomes are spherical to cup-shaped bilayered membrane enclosed nanosize vesicles (30-100 nm) which have the ability to shuttle active cargoes between cells. Johnstone et al. 1987 pioneered in documenting the generation of exosomes in differentiat... Read more.
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CD19: An Undoubted Biomarker for B Cells
CD19 is a cell surface protein member of the large immunoglobulin superfamily that complexes with CD21, CD81, and CD225 in the membrane of mature B-cells. A major function of CD19 is to assemble with the antigen receptor of B-lymphocytes to decrease t... Read more.
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CD81/TAPA1: I'm on Tapa the Cell
Target of the antiproliferative 1 (TAPA1), also known as CD81, is found in the plasma membrane in lymphocytes and plays an important role in the regulation of lymphoma cell growth. This transmembrane 4 superfamily (TM4SF) protein is primarily found on... Read more.
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Read more CD81 related blogs.
