a protein kinase of the STE11 family. Phosphorylates and activates MKK4 and -7, which in turn activate JNK1, -2 and -3. Contains 1 RING-type zinc finger. The RING finger domain of MEKK1 exhibits E3 ubiquitin ligase activity toward c-Jun. c-Jun is downregulated in response to osmotic stress via ubiquitination-mediated degradation by the RING finger domain of MEKK1. Overexpressed/overactivated in multiple tumor types. The Mek1/2 inhibitor U0126 blocks export of influenza viral particles and has been suggested as an antiviral treatment. Single mutations at the same point of each gene also associated with cardiofaciocutaneous syndrome, (also linked with Braf and Kras mutations), displaying morphological, cardiac and mental defects. Inhibitors: U0126, CI-1040/PD184352, PD-0325901 (Phase I cancer), ARRY-142886 (Phase 1, cancer). Note: This description may include information from UniProtKB.
Protein type: EC 126.96.36.199; Kinase, protein; Ligase; Protein kinase, STE; Protein kinase, Ser/Thr (non-receptor); STE group; STE11 family; Ubiquitin conjugating system; Ubiquitin ligase
Molecular Function: protein binding; protein kinase activity; protein kinase binding; protein serine/threonine kinase activity
Biological Process: activation of protein kinase activity; MyD88-dependent toll-like receptor signaling pathway; regulation of apoptosis; regulation of mitotic cell cycle; stress-activated protein kinase signaling pathway