The 5H4 antibody monoclonal antibody specifically binds to mouse CD122. CD122 is a 70-85 kDa type I transmembrane glycoprotein of the hematopoietin receptor superfamily. CD122 is also known as IL-2 Receptor beta chain (IL-2Rβ) or IL-15 Receptor beta chain (IL-15Rβ) as it helps form signaling receptor complexes for Interleukin-2 (IL-2) or IL-15, respectively. CD122 can combine with either CD132 (γc) alone or CD132 plus CD25 (IL-2Rα) to form intermediate or high-affinity IL-2 Receptor complexes, respectively. The IL-2R β chain is constitutively expressed on NK cells and at lower levels on some thymocytes, T cells, B cells, monocytes, and macrophages. IL-2R β chain expression is upregulated by IL-2. The immunogen used to generate this hybridoma was rat myeloma cells transfected with a truncated IL-2R β cDNA. 5H4 does not block IL-2 binding to the IL-2 Receptor.
The antibody was conjugated to BD Horizon BUV615 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome with an Ex Max near 350 nm and an Em Max near 615 nm. BD Horizon Brilliant BUV615 can be excited by the ultraviolet laser (355 nm) and detected with a 610/20 filter and a 595 nm LP. Due to the excitation of the acceptor dye by the blue/yellow-green laser line, there may be significant spillover into channels detecting PE-CF594 like emissions (eg, 610/20-nm filter).