Recombinant Human CD8 alpha/beta Heterodimer Protein, CF Summary
|Human CD8 alpha|
Accession # P01732
|Human CD8 beta|
Accession # P10966
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS.|
|Reconstitution||Reconstitute at 500 μg/mL in PBS.|
|Shipping||The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.|
|Stability & Storage:||Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
Immobilized Recombinant Human CD8 alpha/beta Heterodimer (Catalog # 9358-CD) supports the adhesion of Jurkat human acute T cell leukemia cells. The ED50 for this effect is 0.8-4 μg/mL.
CD8, also known as Ly2 or Leu2, is a heterodimeric glycoprotein (alpha and beta subunits) that functions in conjunction with the T cell receptor in the recognition of MHC class I/peptide complexes (1, 2). CD8 alpha is expressed on double positive (CD4+ CD8+) thymocytes and mature CD8+ cytolytic T cells (CTL) (3-5), intraepithelial lymphocytes (IEL) (6), some gamma δ T cells (7), subsets of thymic and splenic dendritic cells (DC) (8), and peritoneal mast cells (9). It can form disulfide linked homodimers or heterodimers with CD8 beta (10). Thymic CD8+ DC express primarily alpha beta heterodimers, while splenic CD8+ DC primarily express alpha alpha homodimers (8). CD8 alpha + DC can present viral antigenic peptides in complex with MHC I and prime CTL responses (11). The approximately 35 kDa mature mouse CD8 alpha consists of a 169 amino acid (aa) extracellular domain (ECD) with one Iglike domain, a 21 aa transmembrane segment, and a 30 aa cytoplasmic domain (12). Within the ECD, mouse CD8 alpha shares 49% and 64% aa sequence identity with human and rat CD8 alpha, respectively.
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- Snow, P.M. and C. Terhorst (1983) J. Biol. Chem. 258:14675.
- Belz, G.T. et al. (2004) J. Immunol. 172:1996.
- Nakauchi, H. et al. (1985) Proc. Natl. Acad. Sci. USA 82:5126.
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