The 15E2 monoclonal antibody specifically binds to CD369 which is also known as CLEC7A (C-type lectin domain family 7 member A), Dectin-1 (Dendritic cell-associated C-type lectin 1), or BGR (Beta-glucan receptor). CD369 is a type II transmembrane C-type lectin that contains a C-terminal stalk with a carbohydrate recognition domain (CRD) in the extracellular domain, a transmembrane segment, and an ITAM containing cytoplasmic tail. This protein is highly expressed on dendritic cells. It is also expressed on B cells, monocytes, eosinophils, mast cells, macrophages, endothelial cells, and is lowly expressed on some subsets of T cells. CD369 binds to beta-glucan polymers and functions as a pattern recognition receptor in innate immune response to fungal and bacterial pathogens. The 15E2 antibody can reportedly stimulate dendritic cells to costimulate immune responses.
The antibody was conjugated to BD Horizon BUV615 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome with an Ex Max near 350 nm and an Em Max near 615 nm. BD Horizon Brilliant BUV615 can be excited by the ultraviolet laser (355 nm) and detected with a 610/20 filter and a 595 nm LP. Due to the excitation of the acceptor dye by the blue/yellow-green laser line, there may be significant spillover into channels detecting PE-CF594 like emissions (eg, 610/20-nm filter).