The 50C1 monoclonal antibody specifically binds to human CD371 which is also known as Clec12A (C-type lectin domain family 12 member A), C-type lectin-like molecule 1 (CLL-1), myeloid inhibitory C-type lectin-like receptor (MICL), or dendritic cell-associated lectin 2 (DCAL-2). It is expressed on a variety of cells including monocytes, macrophages, dendritic cells, and granulocytes and perhaps some NK cells. Clec12A is a member of the C-type lectin/C-type lectin-like domain (CTL/CTLD) superfamily. It is a 30 kDa type II transmembrane glycoprotein that has one single C-type lectin-like domain and one cytoplasmic immunoreceptor tyrosine-based inhibitory motif (ITIM). Clec12A has similarity with the β-glucan receptor (Dectin-1) and LOX-1 with high N-glycosylation. There are at least five isoforms due to alternative transcript splicing. Signaling through Clec12A can induce internalization of Clec12A, dendritic cell maturation and the production of cytokines including IL-12. Clec12A may also serve as a negative regulator of activated leukocytes recruited to sites of inflammation.
The antibody was conjugated to BD Horizon™ BUV563 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 which has an Ex Max of 348 nm and an acceptor dye. The tandem has an Em Max at 563 nm. BD Horizon BUV563 can be excited by the 355 nm ultraviolet laser. On instruments with a 561 nm Yellow-Green laser, the recommended bandpass filter is 585/15 nm with a 535 nm long pass to minimize laser light leakage. When BD Horizon BUV563 is used with an instrument that does not have a 561 nm laser, a 560/40 nm filter with a 535 nm long pass may be more optimal. Due to the excitation and emission characteristics of the acceptor dye, there may be spillover into the PE and PE-CF594 detectors. However, the spillover can be corrected through compensation as with any other dye combination.