cd06621: PKc_MAPKK_Pek1_like (this model, PSSM-Id:132952 is obsolete and has been replaced by 270793)
Catalytic domain of fungal Pek1-like dual-specificity MAP kinase kinases
Protein kinases (PKs), MAP kinase kinase(MAPKK) subfamily, fungal Pek1-like proteins, 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 of the MAP kinase (MAPK), which is phosphorylated and activated by a MAPK kinase (MAPKK or MKK), which itself is phosphorylated and activated by a MAPK kinase kinase (MAPKKK or MKKK). Members of this group include the MAPKKs Pek1/Skh1 from Schizosaccharomyces pombe and MKK2 from Saccharomyces cerevisiae, and related proteins. Both fission yeast Pek1 and baker's yeast MKK2 are components of the cell integrity MAPK pathway. In fission yeast, Pek1 phosphorylates and activates the MAPK Pmk1/Spm1 and is regulated by the MAPKKK Mkh1. In baker's yeast, the pathway involves the MAPK Slt2, the MAPKKs MKK1 and MKK2, and the MAPKKK Bck1. The cell integrity MAPK cascade is activated by multiple stress conditions, and is essential in cell wall construction, morphogenesis, cytokinesis, and ion homeostasis.
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.
Jiyao W et al.(2023). "The conserved domain database in 2023.",