PDPK1 (PDK1) activates ribosomal S6 kinases (RSKs) by phosphorylating a conserved serine residue S221 (in RPS6KA1). The binding site for PDPK1 on RSKs is available after RSK phosphorylation by MAPKs/ERKs. PDPK1 is present in the activated form at the plasma membrane where the phosphorylation occurs (Jensen et al. 1999).
Frödin, M, Krag, TO, Gammeltoft, S, Jensen, CJ, Buch, MB, Hemmings, BA
protein serine/threonine kinase activity of PDPK1:PIP3,PDPK1:PIP2 [plasma membrane]
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