The 7D2D3 monoclonal antibody specifically recognizes mouse Dendritic Cell Activating Receptor 2 (DCAR2), a C-type lectin encoded by the Clec4b1 gene. DCAR2 (Clec4b1) is a member of the dendritic cell immunoreceptor (DCIR) family, which contains four dendritic cell inhibitory receptors (DCIR1-4) and two activating receptors (DCAR1, 2). The extracellular region of DCAR2 (Clec4b1) has one C-type lectin carbohydrate recognition domain (CRD), that is highly similar to that of DCIR1, followed by a transmembrane region. Instead of a cytoplasmic Immunoreceptor Tyrosine-based Inhibitory Motif (ITIM) that can transmit inhibitory signals, DCAR2 associates with the Immunoreceptor Tyrosine-based Activating Motif (ITAM)-containing adaptor molecule, Fc Receptor γ (FcRγ). DCAR2 (Clec4b1) is expressed on restricted subsets of conventional dendritic cells in bone marrow and skin-draining lymph nodes. C-type lectins bind to carbohydrates in a calcium-dependent manner, and this receptor may be involved in the regulation of immune responses to bacterial infections.
The antibody was conjugated to BD Horizon™ BV650 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.