The 2D3 monoclonal antibody specifically binds to CD275, which is also known as B7 homolog 2 (B7-H2/B7H2) and B7-related protein 1 (B7RP-1). CD275 is a type I transmembrane glycoprotein that belongs to the Ig superfamily. CD275 is likewise known as Inducible T-cell co-stimulator ligand (ICOS Ligand /ICOSLG/ICOS-L). It can bind to CD278 (ICOS) and costimulate the proliferation and cytokine production of antigen-stimulated human T cells. CD275 is variable expressed by subsets of B cells, monocytes, macrophages, dendritic cells and endothelial cells.
The antibody was conjugated to an oligonucleotide that contains an antibody clone-specific barcode (ABC) flanked by a poly-A tail on the 3' end and a PCR handle (PCR primer binding site) on the 5' end. The ABC for this antibody was designed to be used with other BD AbSeq oligonucleotides conjugated to other antibodies. All AbSeq ABC sequences were selected in silico to be unique from human and mouse genomes, have low predicted secondary structure, and have high Hamming distance within the BD AbSeq portfolio, to allow for sequencing error correction and unique mapping. The poly-A tail of the oligonucleotide allows the ABC to be captured by the BD Rhapsody™ system or other oligo-dT-based capture systems. The 5' PCR handle allows for efficient sequencing library generation for Illumina sequencing platforms.