MAPK Scaffold Protein 1 (MAPKSP1) Human Recombinant Protein

This gene encodes a scaffold protein that functions in the extracellular signal-regulated kinase (ERK) cascade. The protein is localized to late endosomes by the mitogen-activated protein-binding protein-interacting protein, and binds specifically to MAP kinase kinase MAP2K1/MEK1, MAP kinase MAPK3/ERK1, and MAP kinase MAPK1/ERK2. Studies of the orthologous gene in mouse indicate that it regulates late endosomal traffic and cell proliferation. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. A pseudogene of this gene is located on the long arm of chromosome 13. [provided by RefSeq, Aug 2011]

LAMTOR3: Regulator of the TOR pathway, a signaling cascade that promotes cell growth in response to growth factors, energy levels, and amino acids. As part of the Ragulator complex, recruits the Rag GTPases and the mTORC1 complex to lysosomes, a key step in activation of the TOR signaling cascade by amino acids. Adapter protein that enhances the efficiency of the MAP kinase cascade facilitating the activation of MAPK2. Interacts with MAP2K1/MEK1 and MAPK2. Interacts with MORG1. Part of the Ragulator complex composed of LAMTOR1, LAMTOR2 and LAMTOR3. Interacts with LAMTOR1; the interaction is direct. Belongs to the LAMTOR3 family.

Protein type: Adaptor/scaffold

Chromosomal Location of Human Ortholog: 4q23

Cellular Component: focal adhesion

Molecular Function: protein binding; guanyl-nucleotide exchange factor activity; protein complex scaffold

Biological Process: positive regulation of TOR signaling pathway; positive regulation of GTPase activity