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Ribosomal protein S6 (rpS6)
- Target
- rpS6
- Molecular classification
- Ribosomal protein, Structural protein, RNA-binding protein
01
Overview
Ribosomal protein S6 is a structural component of the small (40S) subunit of the eukaryotic ribosome, conserved across species[1][7]. It plays a central role in translation, and its phosphorylation by S6 kinase (S6K1, S6K2) or RSK is tightly regulated by cellular signals such as growth factors, mitogens, and nutrients via the mTOR signaling pathway[3][6][9]. Phosphorylation of rpS6 modulates specific features of translation, cell size regulation, proliferation, and glucose metabolism. In neurons, phosphorylated rpS6 is used as a marker for neuronal activity. Dysregulation of its pathway can contribute to diseases such as cancer and metabolic disorders. However, the protein itself is not considered a direct therapeutic target; instead, its upstream kinases (S6Ks, mTOR) are the current focus for drug development.
- Other names
- rpS6eS6
02
Mechanism of action
Not directly druggable. When the upstream S6 kinase or mTOR is inhibited (e.g. by rapamycin), this leads to decreased phosphorylation of rpS6 and consequently altered cell growth, proliferation, or translation
03
Biological functions
Translation (protein synthesis)Regulation of cell sizeRegulation of cell proliferationGlucose homeostasisNeuronal activity markermRNA interaction and selective mRNA translation
04
Disease associations
Cancer (via dysregulation of mTOR/S6K/S6 pathway)Neurodegenerative disease (as a neuronal activity marker)Metabolic disease (via effects on cell size, glucose homeostasis)Other
05
Safety considerations
Not directly drugged; safety concerns relate to targeting the upstream mTOR/S6K pathway (e.g., risk of metabolic disturbances, immunosuppression, impact on growth and cell proliferation with agents like rapamycin)No specific safety concerns directly related to rpS6 protein as it is an essential housekeeping protein in normal ribosome function.
06
Interacting drugs
None known to directly target rpS6. (Most drugs target S6 kinase or mTOR upstream in the pathway, not the ribosomal protein itself)
07
Biomarkers
Phosphorylated rpS6 (p-rpS6) is widely used as a biomarker for: Neuronal activitymTOR pathway activationCellular responses to mitogens, growth factors, and nutrient signaling
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