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Recombinant Human CD8 alpha Fc Chimera Protein, CF

Catalog #: 10927-CD Datasheet
Catalog # Availability Size / Price Qty
10927-CD-050
Recombinant Human CD8 alpha Fc Chimera Protein Binding Activity.
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Summary Product Datasheets Carrier Free Data Images Reconstitution Calculator Background Related Research Areas

Recombinant Human CD8 alpha Fc Chimera Protein, CF Summary

Product Specifications

Purity
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Activity
Measured by its binding ability in a functional ELISA. When Human CD8 alpha Antibody (Catalog # MAB3803) is immobilized at 2.00 μg/mL, 100 μg/mL, Recombinant Human CD8 alpha alpha Fc Chimera binds with an ED50 of 1.50-15.0 ng/mL.
Source
Chinese Hamster Ovary cell line, CHO-derived human CD8 protein
Human CD8 alpha
(Ser22-Asp182)
Accession # P01732.1		IEGRMD Human IgG1
(Pro100-Lys330)
N-terminusC-terminus
Accession #
P01732.1
N-terminal Sequence
Analysis
Ser22
Structure / Form
Disulfide-linked homodimer
Predicted Molecular Mass
44 kDa
SDS-PAGE
54-60 kDa, under reducing conditions.

Product Datasheets

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10927-CD

Product Datasheet

Carrier Free

What does CF mean?

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.

What formulation is right for me?

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.

10927-CD

Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Scientific Data

Binding Activity View Larger

When Human CD8a Antibody (MAB3803) is immobilized at 2 μg/mL, 100 μg/mL, Recombinant Human CD8a Fc Chimera Protein (Catalog # 10927-CD) binds with an ED50 of 1.50-15.0 ng/mL.

SDS-PAGE View Larger

2 μg/lane of Recombinant Human CD8 alpha Fc Chimera Protein (Catalog # 10927-CD) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 54-60 kDa and 110-120 kDa, respectively.

Background: CD8

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) (88), 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). CD8a+ 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.

References
  1. Laugel, B. et al. (2011) J. Leukoc. Biol. 90:1089.
  2. Cole, D.K. et al. (2012) Immunology 137:139.
  3. Germain, R.N. (2002) Nat. Rev. Immunol. 2:309.
  4. Ledbetter, J.A. et al. (1980) J. Exp. Med. 152:280.
  5. Nakayama, K. et al. (1994) Science 263:1131.
  6. Wang, J. and J.R. Klein (1994) Science 265:1860.
  7. MacDonald, H.R. et al. (1990) Eur. J. Immunol. 20:927.
  8. Vremec, D. et al. (1992) J. Exp. Med. 176:47.
  9. Lin, T.J. et al. (1998) J. Immunol. 161:6265.
  10. Snow, P.M. and C. Terhorst (1983) J. Biol. Chem. 258:14675.
  11. Belz, G.T. et al. (2004) J. Immunol. 172:1996.
  12. Nakauchi, H. et al. (1985) Proc. Natl. Acad. Sci. USA 82:5126.
Entrez Gene IDs
925 (Human); 12525 (Mouse); 24930 (Rat); 102124337 (Cynomolgus Monkey); 493799 (Feline)
Alternate Names
CD_antigen: CD8a; CD8 antigen, alpha polypeptide (p32); CD8; CD8a molecule; CD8A; Leu2 T-lymphocyte antigen; LEU2; MAL; OKT8 T-cell antigen; p32; T cell co-receptor; T8 T-cell antigen; T-cell antigen Leu2; T-cell surface glycoprotein CD8 alpha chain; T-lymphocyte differentiation antigen T8/Leu-2

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