Purity: > 85% by SDS - PAGE Format: Liquid. In 20mM Tris-HCl (pH8.0) containing 10% glycerol. AKT1 serine-threonine protein kinase is catalytically inactive in serum-starved primary and immortalized fibroblasts. AKT1 and the related AKT2 are activated by platelet-derived growth factor. The activation is rapid and specific, and it is abrogated by mutations in the pleckstrin homology domain of AKT1. It was shown that the activation occurs through phosphatidylinositol 3-kinase. In the developing nervous system AKT is a critical mediator of growth factor-induced neuronal survival. Recombinant human AKT1 protein, fused to His-tag at N-terminus, was expressed in E.coli.