PDPK1 (PDK1) activates SGK1 by phosphorylating threonine residue T256, located in the activation loop of SGK1. Phosphorylation of SGK1 at S422 facilitates subsequent phosphorylation at T256 (Kobayashi and Cohen 1999).
Cohen, P, Kobayashi, T
protein serine/threonine kinase activity of PDPK1:PIP3 [plasma membrane]
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