The MMRI-7 monoclonal antibody specifically recognizes CD205 which is also known as DEC-205, Lymphocyte antigen 75 (Ly-75), or C-type lectin domain family 13 member B (CLEC13B). CD205 is a ~205 kDa type I transmembrane glycoprotein with C-type lectin external domains. DEC-205 is expressed on myeloid and plasmacytoid dendritic cells, thymic epithelial cells, and at lower levels on monocytes, T cells, B cells, and natural killer (NK) cells. DEC-205 likely functions as an endocytic receptor and is involved in antigen uptake and processing.
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.