cd05581: STKc_PDK1 (this model, PSSM-Id:173672 is obsolete and has been replaced by 270733)
Catalytic domain of the Protein Serine/Threonine Kinase, Phosphoinositide-dependent kinase 1
Serine/Threonine Kinases (STKs), Phosphoinositide-dependent kinase 1 (PDK1) subfamily, catalytic (c) domain. STKs catalyze the transfer of the gamma-phosphoryl group from ATP to serine/threonine residues on protein substrates. The PDK1 subfamily is part of a larger superfamily that includes the catalytic domains of other protein STKs, protein tyrosine kinases, RIO kinases, aminoglycoside phosphotransferase, choline kinase, and phosphoinositide 3-kinase (PI3K). PDK1 carries an N-terminal catalytic domain and a C-terminal pleckstrin homology (PH) domain that binds phosphoinositides. It phosphorylates the activation loop of AGC kinases that are regulated by PI3K such as PKB, SGK, and PKC, among others, and is crucial for their activation. Thus, it contributes in regulating many processes including metabolism, growth, proliferation, and survival. PDK1 also has the ability to autophosphorylate and is constitutively active in mammalian cells. PDK1 is essential for normal embryo development and is important in regulating cell volume.