3-phosphoinositide-dependent protein kinase 1 (PDPK1) (PDPK1)

3-phosphoinositide-dependent protein kinase 1 (PDPK1) is a master serine/threonine kinase belonging to the AGC kinase family, essential for regulating cell growth, proliferation, and survival (UniProt P54646). It functions as a central hub in the PI3K/Akt signaling pathway, where it phosphorylates and activates numerous downstream targets, including Akt, p70S6K, and SGK. The Pleckstrin Homology (PH) domain of PDPK1 is a critical regulatory module that binds to phosphatidylinositol (3,4,5)-trisphosphate (PIP3) and phosphatidylinositol (3,4)-bisphosphate at the plasma membrane, facilitating the co-localization and subsequent activation of Akt (PubMed: 11514514). Overexpression or overactivation of PDPK1 is frequently observed in various cancers, including breast, pancreatic, and lung cancers, making it a high-priority therapeutic target (PubMed: 15937139). Therapeutic strategies include ATP-competitive inhibitors like GSK2334470 and allosteric inhibitors such as PHT-427, which specifically targets the PH domain to prevent membrane recruitment (PubMed: 20647471). Despite its potential, targeting PDPK1 poses challenges due to its broad physiological roles, particularly in glucose metabolism, which can lead to side effects like hyperglycemia (PubMed: 21825005).

Other names

PDK13-phosphoinositide-dependent protein kinase-1hPDK1PRO0461

Inhibition of the phosphorylation of the activation loop (T-loop) of AGC kinases; Allosteric modulation via the Pleckstrin Homology (PH) domain or PIF-pocket; Competitive inhibition of the ATP-binding site