Recombinant Mouse NKG2A Fc Chimera Protein, CF

  • 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 Recombinant Mouse NKG2A/CD159a Fc Chimera is coated at 0.5 µg/mL, recombinant human CD94 binds with a typical ED50 of
    0.1-0.6 μg/mL.
  • Source
    Chinese Hamster Ovary cell line, CHO-derived
    MDPMouse IgG2A
    IEGRMouse NKG2A
    Accession # Q9Z202
  • Accession #
  • N-terminal Sequence
  • Predicted Molecular Mass
    44 kDa
    58-67 kDa, reducing conditions
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.
  • 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.
Data Images
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.
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).
  • References:
    1. Das, J. and S.I. Khakoo (2015) Immunol. Rev. 267:214.
    2. Vance, R.E. et al. (1998) J. Exp. Med. 188:1841.
    3. Saez-Borderias, A. et al. (2009) J. Immunol.182:829.
    4. Houchins, J.P. et al. (1997) J. Immunol. 158:3603.
    5. Brooks, A.G. et al. (1997) J. Exp. Med. 185:795.
    6. Zhou, J. et al. (2008) J. Immunol. 180:25.
    7. Braud, V.M. et al. (1998) Nature 391:795.
    8. Carretero, M. et al. (1997) Eur. J. Immunol. 27:563.
    9. Lee, N. et al. (1998) Proc. Natl. Acad. Sci. USA 95:5199.
    10. Tomasec, P. et al. (2000) Science 287:1031.
    11. Brooks, C.R. et al. (2006) J. Immunol. 176:1141.
  • Long Name:
    Natural Killer G2A
  • Entrez Gene IDs:
    3821 (Human); 16641 (Mouse)
  • Alternate Names:
    CD159 antigen-like family member A; CD159a antigen; CD159a; C-lectin type II protein; killer cell lectin-like receptor subfamily C, member 1; Klrc1; MGC13374; natural killer cell lectin; natural killer group protein 2; NK cell receptor A; NKG2; NKG2-1/B activating NK receptor; NKG2-A; NKG2-A/B type II integral membrane protein; NKG2-A/B-activating NK receptor; NKG2-A/NKG2-B type II integral membrane protein; NKG2AMGC59791; NKG2-B
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