The KJ23 monoclonal antibody specifically recognizes Vβ 17[a] T-cell Receptor (TCR) of mice having the a haplotype (eg,C57L, SJL, SWR) of the Tcrb gene complex. Strains having the b (eg, A, AKR, BALB/c, CBA,C3H/He, C57BL, C58, DBA/1, DBA/2) Tcrb haplotype do not express functional Vβ 17 TCR, and the Tcrb-V17 gene locus is deleted in mice having the c (eg, RIII) haplotype. Vβ 17[a] TCR-bearing Tlymphocytes are clonally eliminated in mice expressing I-E (eg, C57BR). KJ23 antibody also recognizes two phenotypic variants of the Vβ 17[a] TCR: Vβ 17[a2] expressed in a variety of wild-derivedmouse strains and Vβ 17[a(cz)] expressed in Mtv-free CZ mice. The effects of Mtv-encoded superantigens upon Vβ 17[a] TCR-bearing T cells has been reviewed. Plate-bound KJ23 antibody activates Vβ 17[a] TCR-bearing T cells, and injection of the antibody can deplete Vβ 17[a]-bearing Tcells.
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.