Anti-CD4 Cytoplasmic Tail Antibody (18715) (18715-100ug)

CD4 is a co-receptor of the T-cell receptor (TCR) and assists the TCR in communicating with antigen-presenting cells. The short cytoplasmic/intracellular tail of CD4 contains a special sequence of amino acids that allow it to recruit and interact with the tyrosine kinase Lck (lymphocyte-specific protein tyrosine kinase). When the TCR and CD4 bind to distinct regions of an antigen-presenting MHCII molecule, tyrosine kinase Lck bound to the cytoplasmic tail of CD4 tyrosine-phosphorylates immunoreceptor tyrosine activation motifs (ITAM) on the cytoplasmic domains of CD3 to amplify the signal generated by the TCR. Many functions have been assigned to the cytoplasmic tail of CD4 including anti-viral regulation (down/up regulation of CD4), T-cell maturation, activation and differentiation, and Lck signal transmission.