cd06607: STKc_TAO (this model, PSSM-Id:132938 is obsolete and has been replaced by 270784)
Catalytic domain of the Protein Serine/Threonine Kinase, Thousand-and-one amino acids proteins
Serine/threonine kinases (STKs), thousand-and-one amino acids (TAO) subfamily, catalytic (c) domain. STKs catalyze the transfer of the gamma-phosphoryl group from ATP to serine/threonine residues on protein substrates. The TAO 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. TAO proteins possess mitogen-activated protein kinase (MAPK) kinase kinase (MAPKKK or MAP3K or MKKK) activity. They activate the MAPKs, p38 and c-Jun N-terminal kinase (JNK), by phosphorylating and activating the respective MAP/ERK kinases (MEKs, also known as MKKs or MAPKKs), MEK3/MEK6 and MKK4/MKK7. MAPK signaling cascades are important in mediating cellular responses to extracellular signals. Vertebrates contain three TAO subfamily members, named TAO1, TAO2, and TAO3.