The C3 II.1 monoclonal antibody specifically recognizes CD49c which is also known as Integrin alpha 3 (α3 integrin). CD49c is encoded by ITGA3 (Integrin subunit alpha 3). CD49c is a 150 kDa type I transmembrane glycoprotein which non-covalently associates with integrin β1 (CD29) to form the α3β1 (CD49c/CD29, VLA-3) complex. CD49c is expressed mostly on endothelial and epithelial cells (basal epidermal layers). It is not expressed on platelets and is expressed weakly on peripheral blood leucocytes, including T cells, B cells, and monocytes. The CD49c/CD29 complex serves as an adhesive receptor for kalinin or epiligrin. This interaction may be important for thymocyte interaction with thymic epithelium.
The antibody was conjugated to BD Horizon™ BUV496 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 496-nm. BD Horizon BUV496 can be excited by the ultraviolet laser (355 nm) and detected with a 515/30 nm filter with a 450LP. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into the channel detecting BD Horizon V500 or BV510 (eg, 525/40-nm filter). However, the spillover can be corrected through compensation as with any other dye combination.