The TU169 monoclonal antibody specifically binds to the human Major Histocompatibility Complex (MHC) Class II HLA-DQ1 and DQ2 antigens and weakly to HLA-DQ3. HLA-DQ antigens exits as heterodimers comprised of polymorphic transmembrane HLA-DQ alpha and beta glycoproteins. HLA-DQ is expressed primarily on B cells, monocytes, macrophages, dendritic cells and activated T lymphocytes. HLA-DQ is involved in presenting peptidic antigens to CD4+ T lymphocytes. This antibody does not cross-react with HLA-DR2 and HLA-DR7. This antibody fixes complement.
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).