The 190909 antibody specifically recognizes a common epitope on the extracellular domains of CD16 (also known as, Fc gamma RIII) and CD32 (Fc gamma RII). CD16 and CD32 serve as low affinity receptors for mouse IgG Fc constant regions and play roles in the activation or inhibition of phagocytosis, antibody-dependent cellular cytotoxicity (ADCC), degranulation, and B cell proliferation. These receptors are variably expressed on B lymphocytes, natural killer (NK) cells, monocytes, macrophages, dendritic cells, Kupffer cells, granulocytes, mast cells, immature thymocytes, and some activated mature T lymphocytes. CD16 and CD32 are single-pass type I transmembrane glycoproteins with two extracellular Ig-like domains and belong to the Ig superfamily. Ligand-bound CD16 can associate with two disulfide-linked FcR-gamma subunits (FcεRIγ) that contain cytoplasmic immunoreceptor tyrosine-based activation motifs (ITAMs) which deliver activating signals intracellularly. CD32 has an intracellular domain with an immunoreceptor tyrosine-based inhibitory motif (ITIM) and functions as an inhibitory receptor.
The antibody was conjugated to BD Horizon BV421 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max near 407 nm and Em Max near 421 nm, BD Horizon BV421 can be excited by the violet laser (405 nm) and detected with a 450/50 nm filter. BD Horizon BV421 conjugates are very bright, often exhibiting a 10 fold improvement in brightness compared to Pacific BlueTM conjugates. Due to nearly identical excitation and emission properties but different spillover characteristics, BD Horizon BV421, Pacific Blue, and BD Horizon V450 cannot be used simultaneously.
