The HP-3D9 monoclonal antibody specifically binds to CD94 which is also known as KP43. CD94 is expressed on the cell surface as a ~70 kDa, disulfide-linked, type II transmembrane glycoprotein dimer. It is encoded by KLRD1 (Killer cell lectin like receptor D1) which belongs to the C-type lectin superfamily. CD94 is expressed on natural killer (NK) cells, especially activated NK cells. It is also expressed on γ/δ TCR+ T lymphocytes, NK-T cells, and on some CD8+CD56+ α/β TCR+ cells. CD94 associates with various NKG2 receptors to form receptors for HLA class I molecules and plays a role in regulating cellular adhesion and activation. The HP-3D9 antibody can reportedly inhibit the cytolytic activity of activated NK cells.
The antibody was conjugated to BD Horizon Red 718, which has been developed exclusively for BD Biosciences as a better alternative to Alexa Fluor® 700. BD Horizon Red 718 can be excited by the red laser (628 – 640 nm) and, with an Em Max around 718 nm, it can be detected using a 730/45 nm filter. Due to similar excitation and emission properties, we do not recommend using R718 in combination with APC-R700 or Alexa Fluor® 700.