Recombinant Human CD3 epsilon Fc Chimera Protein, CF Summary
|Human CD3 epsilon |
Accession # P07766
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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:||
Background: CD3 epsilon
CD3 epsilon (T-Cell Surface Glycoprotein CD3 Epsilon) is a type I transmembrane protein that belongs to the Ig (Immunoglobulin) superfamily. Human CD3 epsilon consists of 104 amino acid (aa) extracellular domain, 26 aa transmembrane domain and 55 aa cytoplasmic domain (1). With the extracellular domain, human CD3 epsilon shares 44.2% and 49% homology with mouse and rat CD3 epsilon respectively. There are four CD3 proteins: CD3δ, CD3 epsilon, CD3 gamma, and CD3 zeta. All CD3 proteins contain ITAM (Immunoreceptor Tyrosine-based Activation Motifs) in the cytoplasmic tail, which becomes phosphorylated by Src family protein tyrosine kinases LCK and FYN upon TCR engagement (2). CD3 proteins form heterodimers of CD3δ/CD3 epsilon and CD3 gamma /CD3 epsilon, which bind to TCR and form trimeric TCR alpha /CD3 epsilon /CD3 gamma and TCR beta /CD3 gamma /CD3 epsilon. The resulting heterohexamer further associates with CD3 zeta homodimer and forms TCR/CD3 signaling complex (3, 4). Similar complex is also formed with TCR gamma and TCRδ (5). CD3 epsilon plays essential role in adaptive immune response. Mutations in CD3 epsilon lead to SCID (severe combined immunodeficiency) (6).
- Gold, D.P. et al. (1986) Nature 321:431.
- Barber, E.K. et al. (1989) Proc. Nat. Acad. Sci. U.S.A. 86:3277.
- Manolios, N. et al. (1991) EMBO J 10:1643.
- Dietrich, J. et al. (1999) Eur J Immunol 29:1719.
- Pan, Q. et al. (2006) Mol Immunol 43:1741.
- Soudais, C. et al. (1993) Nat. Genet. 3:77.
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