Serine/Threonine-Protein Kinase TOR (TOR) Arabidopsis Thaliana Recombinant Protein

Related to TOR proteins from yeast and mammals, regulators of cell growth in response to nutrient availability. TOR proteins belong to the family of phosphatidylinositol 3-kinase and are targets of the antiproliferative drug rapamycin. AtTOR binds the yeast FKBP12 protein in the presence of Rapamycin, is involved in embryogenesis and is expressed in embryos, endosperm and meristems.

Essential cell growth regulator that controls development from early embryo to seed production. Controls plant growth in environmental stress conditions. Acts through the phosphorylation of downstream effectors that are recruited by the binding partner RAPTOR. Acts by activating transcription, protein synthesis and ribosome biogenesis, and inhibiting mRNA degradation and autophagy. Can phosphorylate TAP46, a regulatory subunit of protein phosphatase 2A that modulates cell growth and survival (PubMed:21216945). Involved in modulating the transition from heterotrophic to photoautotrophic growth by regulating the expression of chloroplast- and photosynthesis-associated genes (PubMed:27479935). Essential for auxin signaling transduction, probably acting in polysomes to maintain the active ATPK1/S6K1 (and thus TIF3H1/eIF3h) phosphorylation status that is critical for translation reinitiation (e.g. uORF-mRNAs loading) (PubMed:23524850, PubMed:27014314). Promotes abscisic acid (ABA) biosynthesis (PubMed:26459592). Involved in the regulation of sugar-mediated (e.g. glucose and sucrose) glycolysis- and mitochondrial bioenergetics-dependent root growth promotion (PubMed:23542588). Required for sugar (e.g. glucose) promotion of hypocotyl elongation in the dark, by activating the brassinosteroid pathway and stabilizing BZR1. The regulation of BZR1 degradation is dependent on autophagy (PubMed:27345161).