CD94 is an approximately 25 kDa type 2 transmembrane protein that plays an important role in regulating natural killer (NK) cell activation (1). Human CD94 consists of a 10 amino acid (aa) cytoplasmic domain, a 21 aa transmembrane segment, and a 148 aa extracellular domain (ECD) with a stem region and one C-type lectin domain (2). Alternative splicing generates additional isoforms that lack either the stem region, the terminal half of the ECD, or the cytoplasmic and transmembrane regions (3). Within the ECD, human CD94 shares 53% and 55% amino acid identity to mouse and rat CD94, respectively. CD94 is expressed at varying cell surface density on NK cells during their differentiation and on a subset of CD8⁺ T cells (4). It associates into disulfide-linked heterodimers with NKG2A/B, C, or E (5-8), and these complexes function as receptors for the nonclassical MHC class I molecule, HLA-E (9, 10). Ligation of CD94-NKG2A or CD94-NKG2C on NK cells triggers inhibitory or activating signals, respectively (11).

References

Chester, C. et al. (2015) Front. Immunol. 6:601.
Chang, C. et al. (1995) Eur. J. Immunol. 25:2433.
Lieto, L.D. et al. (2006) Genes Immun. 7:36.
Yu, J. et al. (2010) Blood 115:274.
Phillips, J.H. et al. (1996) Immunity 5:163.
Lazetic, S. et al. (1996) J. Immunol. 157:4741.
Brooks, A.G. et al. (1997) J. Exp. Med. 185:795.
Carretero, M. et al. (1997) Eur. J. Immunol. 27:563.
Braud, V.M. et al. (1998) Nature 391:795.
Kraemer, T. et al. (2014) J. Immunol. Res. 2014:352160.
Houchins, J.P. et al. (1997) J. Immunol. 158:3603.

Alternate Names

CD94, KLRD1

Entrez Gene IDs

3824 (Human); 16643 (Mouse); 102119829 (Cynomolgus Monkey)

Gene Symbol

KLRD1

UniProt

Q13241.2

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Product Specific Notices for Human CD94 Alexa Fluor™ Plus 405-conjugated Antibody

This product is provided under an intellectual property license from Life Technologies Corporation. The transfer of this product is conditioned on the buyer using the purchased product solely in research conducted by the buyer, excluding contract research or any fee for service research, and the buyer must not (1) use this product or its components for (a) diagnostic, therapeutic or prophylactic purposes; (b) testing, analysis or screening services, or information in return for compensation on a per-test basis; or (c) manufacturing or quality assurance or quality control, and/or (2) sell or transfer this product or its components for resale, whether or not resold for use in research. For information on purchasing a license to this product for purposes other than as described above, contact Life Technologies Corporation, 5781 Van Allen Way, Carlsbad, CA 92008 USA or outlicensing@thermofisher.com.

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Human CD94 Alexa Fluor™ Plus 405-conjugated Antibody

R&D Systems, part of Bio-Techne | Catalog # FAB10581AFP405

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Background: CD94