Ribosomal S6 Kinase Signaling and the Control of Translation
Abstract
The highly homologous 40S ribosomal protein S6 kinases (S6K1 and S6K2) play a key role in the regulation of cell growth by controlling the biosynthesis of translational components which make up the protein synthetic apparatus, most notably ribosomal proteins. In the case of S6K1, at least eight phosphorylation sites are believed to mediate kinase activation in a hierarchical fashion. Activation is initiated by phosphatidylinositide-3OH kinase (PI3K)-mediated phosphorylation of key residues in the carboxy-terminus of the kinase, allowing phosphorylation of a critical residue residing in the activation loop of the catalytic domain by phosphoinositide-dependent kinase 1 (PDK1). The kinases responsible for phosphorylating the carboxy-terminal sites have yet to be identified. Additionally, S6 kinases are under the control of the PI3K relative, mammalian Target Of Rapamycin (mTOR), which may serve an additional function as a checkpoint for amino acid availability. In this review we set out to discuss the present state of knowledge regarding upstream signaling components which have been implicated in the control of S6K1 activation and the role of the kinase in controlling cell growth through regulating ribosome biogenesis at the translational level.
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mTOR can phosphorylate eIF4G and ribosomal S6 kinases such as p70S6K, which phosphorylate eIF4B, enhancing its interaction with eIF3 and stimulating protein synthesis.
“mTOR can also phosphorylate eIF4G, the ribosomal S6 kinases (RS6K) such as p70S6K which phosphorylate eIF4B, enhancing its interaction with eIF3 and stimulate protein synthesis [75–77] (Fig. 1).”
From PKR, the double stranded RNA‐dependent protein kinase as a critical target in Alzheimer's disease (2009) · cites this paper as [77]
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- Authors
- Dufner, A., & Thomas, G.
- Affiliations
- Friedrich Miescher Institute (CH)
- Corresponding author
- Thomas, George
- ORCID
- Dufner, Almut
- Venue
- Experimental Cell Research
- Publisher
- Elsevier BV
- Published
- 1999-11
- Volume
- 253
- Issue
- 1
- Pages
- 100-109
- ISSN
- 0014-4827 (ISSN-L)
- OpenAlex
- W1963723155
- Cited by
- 676
- References
- 0
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 7 · 2023: 8 · 2022: 11 · 2021: 20 · 2020: 9 · 2019: 9 · 2018: 13 · 2017: 22 · 2016: 20 · 2015: 24 · 2014: 21 · 2013: 20 · 2012: 28
- FWCI
- 14.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Experimental Cell Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- RSK, S6K1, S6K2, translational regulation, PI3K signaling, PDK1, mTOR, kinase activation, activation loop, ribosome biogenesis, cell growth regulation, amino acid availability
- MeSH terms
- Cell Division, Enzyme Activation, Isoenzymes, Protein Kinase C, Protein Biosynthesis, Signal Transduction, Ribosomal Protein S6 Kinases, Sirolimus, Cell Size
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