The YLI-90 monoclonal antibody specifically reacts with the B6 alloantigen of Ly-49I, an inhibitory receptor which is expressed on subsets of natural killer (NK) cells, NK-1.1+ (or DX5+) T lymphocytes (NK-T cells), and on a population of memory CD8+ T lymphocytes in C57BL/6 mice, but not AKR/J, BALB/c, DBA/1, or SJL mice. The Ly-49 family of NK-cell receptors are disulfide-linked type-II transmembrane protein homodimers with extracellular carbohydrate-recognition domains (CRD). Ly-49I is closely related to Ly-49C[B6] and Ly49C[BALB], and these three alloantigens are recognized by mAb 5E6 (Cat. No. 553277). A Ly-49I[BALB] allele has not been found. The Ly-49 family members are expressed independently, such that an individual NK or T cell may display more than one class of Ly-49 receptor homodimers. Binding of Ly-49I-expressing transfectants to cell lines bearing MHC class I antigens of the b,d, k and s haplotypes was not detected. In contrast, Ly-49I-expressing transfectants were found to weakly bind lymphoblasts of the b, d, k, q, s, and v haplotypes and to strongly bind H-2[r] lymphoblasts. Ly-49I-bearing NK cells may mediate allogeneic and hybrid resistance to transplantation of H-2[d] bone marrow.
This antibody is conjugated to BD Horizon™ BV605 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max of 602-nm, BD Horizon BV605 can be excited by a violet laser and detected with a standard 610/20-nm filter set. BD Horizon BV605 is a tandem fluorochrome of BD Horizon BV421 and an acceptor dye with an Em max at 605-nm. Due to the excitation of the acceptor dye by the green (532 nm) and yellow-green (561 nm) lasers, there will be significant spillover into the PE and BD Horizon PE-CF594 detectors off the green or yellow-green lasers. BD Horizon BV605 conjugates are very bright, often exhibiting brightness equivalent to PE conjugates and can be used as a third color off of the violet laser.