Human TEM7/PLXDC1 Isoform 1 Antibody

TEM7 (Tumor endothelial marker 7; also TEM3 and Plexin domain-containing protein-1/PXDC1) is an 85 kDa member of the plexin family of proteins. It is one of a number of TEM designated molecules that are related only a name and not structural similarity. TEM7 is found on tumor endothelial cells, newly formed endothelial cells and neurons. It is known to bind nidogen. Mature human TEM7 is a type I transmembrane glycoprotein 482 amino acids (aa) in length. It contains an extracellular region (aa 19‑426) with one plexin domain (aa 303‑347). There are three isoform variants. One is intracellular and shows an alternate start site at Met74 accompanied by a 28 aa substitution for aa 331‑500. The other two are soluble, with one showing only the above 28 aa substitution and a second showing an eight aa substitution for aa 331‑500. Over aa 19‑426, human TEM7 shares 81% aa identity with mouse TEM7.