The Human Leukocyte Antigen (HLA) complex is the human version of the MHC, helping the immune system distinguish the body's own proteins versus those from foreign invaders, such as viruses. Humans have three main MHC class I genes, known as HLA-A, HLA-B and HLA-C. Major histocompatibility complex (MHC) class I molecules, which are widely found on the surface of nucleated cells, function by binding peptides and displaying them on the cell surface to cytotoxic T-cells. Intracellular degradation of cytosolic proteins by the proteasome generates many of the peptides that load MHC class I molecules. MHC class I may also serve as an inhibitory ligand for natural killer (NK) cell receptors (KIR, Killer Immunoglobulin-like Receptors), which viruses may modulate expression levels for to evade immune detection. The G46-2.6 monoclonal antibody binds to a monomorphic epitope on the alpha chain of HLA-A, HLA-B and HLA-C.
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).