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™ BB700, which is part of the BD Horizon Brilliant™ Blue family of dyes. It is a polymer-based tandem dye developed exclusively by BD Biosciences. With an excitation max of 485 nm and an emission max of 693 nm, BD Horizon BB700 can be excited by the 488 nm laser and detected in a standard PerCP-Cy™5.5 set (eg, 695/40-nm filter). This dye provides a much brighter alternative to PerCP-Cy5.5 with less cross laser excitation off the 405 nm and 355 nm lasers.