Alexa Fluor^® 647 Mouse Anti-Human CD119 Antibody (S-3124)

CD119, also known as the Interferon Gamma Receptor 1 (IFNGR1), is a critical transmembrane protein that serves as the primary ligand-binding subunit of the type II interferon receptor complex, playing a pivotal role in the immune system's response to viral, bacterial, and parasitic infections. Structurally, CD119 consists of an extracellular domain responsible for high-affinity binding to interferon-gamma (IFN-γ), a single transmembrane helix, and an intracellular domain that initiates downstream signaling cascades by recruiting Janus kinase 1 (JAK1) and subsequently activating the Signal Transducer and Activator of Transcription 1 (STAT1) pathway, which leads to the transcription of genes involved in antigen presentation, macrophage activation, and pro-inflammatory responses. As an essential component of host defense, CD119 facilitates communication between immune cells, particularly enhancing the microbicidal activity of macrophages and promoting Th1 differentiation, while genetic mutations or deficiencies in the IFNGR1 gene can result in Mendelian Susceptibility to Mycobacterial Diseases (MSMD), highlighting its indispensable function in maintaining immunity against intracellular pathogens.