Mitogen Activated Kinase Kinase 1 (MEK1) Human Active Protein

The protein encoded by this gene is a member of the dual specificity protein kinase family, which acts as a mitogen-activated protein (MAP) kinase kinase. MAP kinases, also known as extracellular signal-regulated kinases (ERKs), act as an integration point for multiple biochemical signals. This protein kinase lies upstream of MAP kinases and stimulates the enzymatic activity of MAP kinases upon wide variety of extra- and intracellular signals. As an essential component of MAP kinase signal transduction pathway, this kinase is involved in many cellular processes such as proliferation, differentiation, transcription regulation and development. [provided by RefSeq, Jul 2008]

MEK1: a dual-specificity protein kinase of the STE7 kinase family. Phosphorylated and activated by Raf, Mos and Cot kinases. Phosphorylates a Thr and a Tyr residue in a Thr-Glu-Tyr sequence located in the activation loop of ERK1 and ERK2. An essential component of MAP kinase signal transduction pathways involved in many cellular processes such as proliferation, differentiation, transcription regulation and development.

Protein type: EC 2.7.12.2; Protein kinase, dual-specificity (non-receptor); Protein kinase, STE; Kinase, protein; STE group; STE7 family

Chromosomal Location of Human Ortholog: 15q22.1-q22.33

Cellular Component: dendrite cytoplasm; Golgi apparatus; microtubule; focal adhesion; mitochondrion; endoplasmic reticulum; early endosome; perikaryon; cell cortex; cytosol; perinuclear region of cytoplasm; axon; cytoplasm; late endosome; plasma membrane; microtubule organizing center; nucleus

Molecular Function: MAP kinase kinase activity; protein serine/threonine kinase activity; protein serine/threonine kinase activator activity; protein binding; Ras GTPase binding; receptor signaling protein tyrosine phosphatase activity; protein-tyrosine kinase activity; protein serine/threonine/tyrosine kinase activity; mitogen-activated protein kinase kinase kinase binding; ATP binding; protein kinase activity

Biological Process: axon guidance; peptidyl-tyrosine phosphorylation; activation of MAPKK activity; nerve growth factor receptor signaling pathway; protein heterooligomerization; activation of MAPK activity; negative regulation of homotypic cell-cell adhesion; response to glucocorticoid stimulus; stress-activated MAPK cascade; cell motility involved in cell locomotion; pathogenesis; toll-like receptor 3 signaling pathway; signal transduction; chemotaxis; toll-like receptor 10 signaling pathway; toll-like receptor 5 signaling pathway; neuron differentiation; negative regulation of cell proliferation; positive regulation of RNA elongation from RNA polymerase II promoter; small GTPase mediated signal transduction; vesicle transport along microtubule; response to axon injury; cell cycle arrest; toll-like receptor 4 signaling pathway; Golgi inheritance; epidermal growth factor receptor signaling pathway; mitosis; fibroblast growth factor receptor signaling pathway; MyD88-independent toll-like receptor signaling pathway; MAPKKK cascade; melanosome transport; toll-like receptor 2 signaling pathway; keratinocyte differentiation; MyD88-dependent toll-like receptor signaling pathway; regulation of stress-activated MAPK cascade; cell proliferation; Ras protein signal transduction; regulation of vascular smooth muscle contraction; toll-like receptor signaling pathway; insulin receptor signaling pathway; innate immune response; response to oxidative stress; toll-like receptor 9 signaling pathway; positive regulation of Ras protein signal transduction; positive regulation of cell differentiation; vascular endothelial growth factor receptor signaling pathway; cell motility; positive regulation of cell migration

Disease: Noonan Syndrome 1; Cardiofaciocutaneous Syndrome 3