Mouse/Rat Plexin B3 Antibody

Plexin-B3 (also plexin-6) is a 260-270 kDa member of the plexin-B subfamily, plexin family of proteins. It is found on postnatal neurons and oligodendroglia, and appears to have opposing functions. In a context-dependent manner, plexin-B3 may block cell process extension and induce growth cone collapse by binding to Sema5. Conversely, it may engage in homophilic interactions in trans, promoting growth cone extension and axon elongation. The HGF receptor Met has been reported to complex with plexin-B3 in cis, and this interaction may contribute to its reported opposing effects. Mature mouse plexin-B3 is an 1868 amino acid (aa) type I transmembrane glycoprotein. It contains a 1211 aa extracellular domain (ECD) (aa 25-1892) plus a 636 aa cytoplasmic region. The ECD contains one Sema-domain (aa 25-451), two PSI domains (aa 454-646) and four IPT regions (aa 814-1224). There is one isoform variant that contains an alternative Met start site 10 aa upstream of the standard site. Based on human studies, proteolysis of mouse plexin-B3 likely occurs, generating 160 kDa and 140 kDa ECD fragments. Over aa 25-1235, mouse plexin-B3 shares 95% and 82% aa identity with rat and human plexin-B3, respectively.