The B-K29 monoclonal antibody specifically binds to CD262 which is also known as, TNF-related apoptosis-inducing ligand receptor 2 (TRAIL Receptor 2, TRAIL-R2), Death receptor 5 (DR5), TRICK2, or KILLER. CD262 is a type I transmembrane protein that is encoded by TNFRSF10B (Tumor necrosis factor receptor superfamily, member 10b). CD262 forms a homotrimeric receptor complex that can bind homotrimeric TRAIL (CD253/APO-2 Ligand) and transduce apoptotic signals intracellularly through its cytoplasmic death domain (DD). CD262 is differentially expressed on cells from a wide variety of normal tissues and tumors. CD262 expression is upregulated by Interferon-α (IFN-α).
The antibody was conjugated to BD Horizon™ BUV737 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 737-nm. BD Horizon Brilliant BUV737 can be excited by the ultraviolet laser (355 nm) and detected with a 740/35 filter. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into channels detecting Alexa Fluor® 700-like dyes (eg, 712/20-nm filter).
Due to spectral differences between labeled cells and beads, using BD™ CompBeads can result in incorrect spillover values when used with BD Horizon BUV737 reagents. Therefore, the use of BD CompBeads or BD CompBeads Plus to determine spillover values for these reagents is not recommended. Different BUV737 reagents (eg, CD4 vs. CD45) can have slightly different fluorescence spillover therefore, it may also be necessary to use clone specific compensation controls when using these reagents.