cd06631: STKc_YSK4 (this model, PSSM-Id:132962 is obsolete and has been replaced by 270801)
Catalytic domain of the Protein Serine/Threonine Kinase, Yeast Sps1/Ste20-related kinase 4
Serine/threonine kinases (STKs), yeast Sps1/Ste20-related kinase 4 (YSK4) subfamily, catalytic (c) domain. STKs catalyze the transfer of the gamma-phosphoryl group from ATP to serine/threonine residues on protein substrates. The YSK4 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. YSK4 is a putative MAPKKK, whose mammalian gene has been isolated. MAPKKKs (MKKKs or MAP3Ks) phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals.