cd06605: PKc_MAPKK (this model, PSSM-Id:173723 is obsolete and has been replaced by 270782)
Catalytic domain of the dual-specificity Protein Kinase, Mitogen-Activated Protein Kinase Kinase
Protein kinases (PKs), MAP kinase kinase (MAPKK) subfamily, catalytic (c) domain. PKs catalyze the transfer of the gamma-phosphoryl group from ATP to serine/threonine or tyrosine residues on protein substrates. The MAPKK subfamily is part of a larger superfamily that includes the catalytic domains of other protein serine/threonine kinases, protein tyrosine kinases, RIO kinases, aminoglycoside phosphotransferase, choline kinase, and phosphoinositide 3-kinase. The mitogen-activated protein (MAP) kinase signaling pathways are important mediators of cellular responses to extracellular signals. The pathways involve a triple kinase core cascade comprising the MAP kinase (MAPK), which is phosphorylated and activated by a MAPK kinase (MAPKK or MKK or MAP2K), which itself is phosphorylated and activated by a MAPK kinase kinase (MAPKKK or MKKK or MAP3K). MAPKKs are dual-specificity PKs that phosphorylate their downstream targets, MAPKs, at specific threonine and tyrosine residues. There are three MAPK subfamilies: extracellular signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and p38. In mammalian cells, there are seven MAPKKs (named MKK1-7) and 20 MAPKKKs. Each MAPK subfamily can be activated by at least two cognate MAPKKs and by multiple MAPKKKs.
Comment:The active site is composed of the ATP binding site and the substrate binding site. The substrate binding site is based on the binding of human PAK4 to a consensus peptide.
Lu S et al.(2020). "CDD/SPARCLE: the conserved domain database in 2020.",