cd06630: STKc_MEKK1 (this model, PSSM-Id:132961 is obsolete and has been replaced by 270800)
Catalytic domain of the Protein Serine/Threonine Kinase, MAP/ERK kinase kinase 1
Serine/threonine kinases (STKs), MAP/ERK kinase kinase 1 (MEKK1) subfamily, catalytic (c) domain. STKs catalyze the transfer of the gamma-phosphoryl group from ATP to serine/threonine residues on protein substrates. The MEKK1 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. MEKK1 is a mitogen-activated protein kinase (MAPK) kinase kinase (MAPKKK or MKKK or MAP3K), that phosphorylates and activates 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. MEKK1 activates the extracellular signal-regulated kinase 1/2 (ERK1/2) and c-Jun N-terminal kinase (JNK) pathways by activating their respective MAPKKs, MEK1/2 and MKK4/MKK7, respectively. MEKK1 is important in regulating cell survival and apoptosis. MEKK1 also plays a role in cell migration, tissue maintenance and homeostasis, and wound healing.