CD81 Antibody (2664C) [Alexa Fluor® 488]

• Applications: WB
• Clone: 2664C
• Clonality: Monoclonal
• Host: Rabbit
• Conjugate: Alexa Fluor 488

CD81 Antibody (2664C) [Alexa Fluor® 488] Summary

• Additional Information: Recombinant Monoclonal Antibody.
• Immunogen: CHO-derived human CD81 protein
  Phe113-Ala201
  Accession # P60033
• Specificity: Detects human CD81 in Elisas.
• Isotype: IgG
• Clonality: Monoclonal
• Host: Rabbit
• Purity Statement: Protein A or G purified

Packaging, Storage & Formulations

• Storage: Protect from light. Do not freeze. 12 months from date of receipt, 2 to 8 °C as supplied
• Buffer: Supplied 0.2mg/ml in 1X PBS with RDF1 and 0.09% Sodium Azide

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Background

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).

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.