Human ICAP-1 Antibody

ICAP-1 (Integrin cytoplasmic domain-associated protein-1; also ITBP1) is a 22-27 kDa protein that specifically binds to the cytoplasmic tail of beta1 integrin. It is widely expressed, and serves to negatively regulate cell migration/proliferation. In the cytosol, it has at least two functions. First, it associates with beta1 integrin, promoting an inactive conformation. This has the effect of both slowing cell migration and allowing for the monitoring of ECM density. Second, it induces Delta-Notch signaling, an event that specifies the growth of only tip endothelium during angiogenesis. In the nucleus, ICAP-1 is proposed to participate in c-myc activation. Human ICAP-1 is 200 amino acids (aa) in length. It contains an NLS (aa 5-9) and one pleckstrin homology-like/PID domain (aa 58-200). Phosphorylation occurs at Thr38 and Ser41. There is one nonintegrin-binding alternative splice form that shows a deletion of aa 128-177. Over aa 1-127, human ICAP-1 shares 93% aa identity with mouse ICAP-1.