The 134591 monoclonal antibody specifically recognizes CD159 antigen-like family member C (CD159c) which is also known as NKG2-C type II integral membrane protein or NKG2-C-activating NK receptor (NKG2C), or NK cell receptor C. CD159c (NKG2C) is a type II transmembrane glycoprotein that is encoded by KLRC2 (killer cell lectin like receptor C2) which belongs to the killer cell lectin-like receptor (KLR) family. CD159c (NKG2C) contains a C-type lectin domain in its extracellular region and is expressed by NK cells and some T cells. CD159c (NKG2C) can form a disulfide-bonded heterodimer with CD94 that non-covalently associates with DAP12 homodimers to form a functional signaling receptor complex. CD159c (NKG2C) binds to MHC class I HLA-E molecules on target cells to regulate NK cell activation.
The antibody was conjugated to BD Horizon™ BUV661 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 661-nm. BD Horizon Brilliant BUV661 can be excited by the ultraviolet laser (355 nm) and detected with a 670/25 filter and a 630 nm LP. Due to cross laser excitation of this dye, there may be significant spillover into channels detecting APC-like emissions (eg, 670/25-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 BUV661 reagents. Therefore, the use of BD CompBeads or BD CompBeads Plus to determine spillover values for these reagents is not recommended. Different BUV661 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.