Recombinant Mouse NKG2A (CHO-expressed) Fc Protein, CF
Recombinant Mouse NKG2A (CHO-expressed) Fc Protein, CF Summary
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Carrier Free
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.
9198-NK
| 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: | Store the unopened product at -20 to -70 °C. Use a manual defrost freezer and avoid repeated freeze-thaw cycles. Do not use past expiration date. |
Scientific Data
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When Recombinant Mouse NKG2A Fc Chimera (Catalog # 9198-NK) is coated at 0.5 μg/mL, recombinant human CD94 binds with a typical ED50 of 0.1-0.6 μg/mL.
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Background: NKG2A/CD159a
NKG2A/CD159a is an approximately 40 kDa transmembrane C-type lectin superfamily protein that inhibits innate immune system activation (1). Mouse NKG2A consists of a 70 amino acid (aa) cytoplasmic domain with two ITIM inhibitory motifs, a 23 aa transmembrane segment, and a 151 aa extracellular domain (ECD) with one C-type lectin domain (2). Within the ECD, mouse NKG2A shares 41% and 71% aa sequence identity with human and rat NKG2A, respectively. Alternative splicing generates additional isoforms with a 17 aa deletion in the extracellular juxtamembrane region or a substitution of that region plus the transmembrane segment. NKG2A is expressed on a subset of NK cells and CD8+ T cells (2-6) where it forms a covalent heterodimer with CD94 (5, 7, 8). NKG2A-CD94 heterodimers bind to the widely expressed nonclassical MHC-I molecule, HLA-E (Qa-1b in mouse), which presents a peptide derived from the signal peptide of classical MHC-I molecules (2, 7). Triggering the NKG2A-CD94 complex inhibits the cytolytic activity of NK and CD8+ T cells (2, 3, 5, 6, 9). This enables the innate immune system to detect cells that express host MHC-I molecules and to protect them from NK cell mediated lysis. This mechanism is subverted by human cytomegalovirus which encodes a peptide that is homologous to the HLA-E binding peptide (10). HCMV infected cells up-regulate both HLA-E and NKG2A expression and utilize this peptide to escape from immune clearance (3, 10). In contrast, vaccinia virus induces HLA-E down-regulation, thus permitting NK cell lysis of the virally infected cell (11).
- Das, J. and S.I. Khakoo (2015) Immunol. Rev. 267:214.
- Vance, R.E. et al. (1998) J. Exp. Med. 188:1841.
- Saez-Borderias, A. et al. (2009) J. Immunol.182:829.
- Houchins, J.P. et al. (1997) J. Immunol. 158:3603.
- Brooks, A.G. et al. (1997) J. Exp. Med. 185:795.
- Zhou, J. et al. (2008) J. Immunol. 180:25.
- Braud, V.M. et al. (1998) Nature 391:795.
- Carretero, M. et al. (1997) Eur. J. Immunol. 27:563.
- Lee, N. et al. (1998) Proc. Natl. Acad. Sci. USA 95:5199.
- Tomasec, P. et al. (2000) Science 287:1031.
- Brooks, C.R. et al. (2006) J. Immunol. 176:1141.
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