The DT-9 monoclonal antibody specifically recognizes Human Leukocyte Antigen (HLA-C), a polymorphic major histocompatibility complex (MHC) class I antigen. HLA-C is a heterodimer comprised of the HLA-C alpha chain, a ~45 kDa type I transmembrane glycoprotein, and a ~12 kDa Beta-2 (β2)-microglobulin light chain. HLA-C is expressed on nearly all cells, and plays a role in the antigen-specific, MHC-restricted presentation of small peptides to CD8+ T cells in the generation of immunity or tolerance. HLA-C may also bind to regulatory MHC class I antigen-selective receptors expressed by CD8+ T cells and natural killer (NK) cells. The DT-9 antibody also recognizes some rare HLA-A and HLA-B allotypes and the nonclassical HLA-E molecule.
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).