cd06641: STKc_MST3 (this model, PSSM-Id:132972 is obsolete and has been replaced by 270809)
Catalytic domain of the Protein Serine/Threonine Kinase, Mammalian Ste20-like protein kinase 3
Serine/threonine kinases (STKs), mammalian Ste20-like protein kinase 3 (MST3) subfamily, catalytic (c) domain. STKs catalyze the transfer of the gamma-phosphoryl group from ATP to serine/threonine residues on protein substrates. The MST3 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. MST3 phosphorylates the STK NDR and may play a role in cell cycle progression and cell morphology. It may also regulate paxillin and consequently, cell migration. MST3 is present in human placenta, where it plays an essential role in the oxidative stress-induced apoptosis of trophoblasts in normal spontaneous delivery. Dysregulation of trophoblast apoptosis may result in pregnancy complications such as preeclampsia and intrauterine growth retardation.
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.",