Mitogen-activated protein kinase (MAPK) signaling cascades include MAPK or extracellular signal-regulated kinase (ERK), MAPK kinase (MKK or MEK), and MAPK kinase (MAPKKK or MEKK). MAPKK kinase/MEKK phosphorylates and activates its downstream protein kinase, MAPK kinase/MEK, which in turn activates MAPK. The kinases of these signaling cascades are highly conserved, and homologs exist in yeast, Drosophila, and mammalian cells. MEKK8 is able to activate NF-kappa-B 1 by stimulating proteasome-mediated proteolysis of NF-kappa-B 1/p105. The protein appears to play an important role in the cell cycle. This cytoplasmic protein is expressed in several normal tissues and human tumor-derived cell lines. The 58 kDa form is activated specifically during the S and G2/M phases of the cell cycle. The longer form undergoes phosphorylation on Ser residues mainly, and the shorter form on both Ser and Thr residues.
Protein Aliases: augmented in rheumatoid arthritis 2; Cancer Osaka thyroid oncogene; cancer Osaka thyroid, oncogene; CCOT; cot (cancer Osaka thyroid) oncogene; COT proto-oncogene serine/threonine-protein kinase; EC 126.96.36.199; Ewing sarcoma transformant; FLJ10486; M3K8; MAP3K 8; mitogen activated protein kinase kinase kinase 8; Mitogen-activated protein kinase kinase kinase 8; Protein kinase cot; Proto-oncogene c-Cot; proto-oncogene serine/threoine protein kinase; serine/threonine kinase (Tpl-2); Serine/threonine-protein kinase cot; TH isoform 3; TH isoform a; TH-4; TPL 2; TPL-2; Tumor progression locus 2; TY3H; TYH
Gene Aliases: AURA2; c-COT; COT; Cot/Tpl2; D17TPL2; EST; ESTF; MAP3K8; MEKK8; Tpl-2; TPL2
Molecular Function: non-receptor serine/threonine protein kinase