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TOR, a central controller of cell growth.
1Department of Biochemistry, Biozentrum, University of Basel, Switzerland.
Cell
|November 1, 2000
Summary
Target of rapamycin (TOR) is a central regulator of cell growth, controlling diverse cellular processes. This kinase is essential for increasing cell mass, distinct from cell proliferation regulators.
Area of Science:
- Cellular biology
- Molecular biology
- Biochemistry
Background:
- Cell growth (increase in cell mass) and cell proliferation (increase in cell number) are fundamental yet distinct processes in multicellular organisms.
- Cyclin-dependent kinases (CDKs) are established as the primary regulators of the cell cycle and proliferation.
- The precise central regulator for cell growth, analogous to CDKs for proliferation, has remained elusive.
Purpose of the Study:
- To identify the central regulator governing cell growth.
- To investigate the role of the target of rapamycin (TOR) pathway in controlling cell mass.
- To determine if TOR functions as an equivalent regulator to CDKs for cell growth.
Main Methods:
- Analysis of TOR signaling pathway components.
- Examination of TOR's downstream targets and their role in cellular metabolism.
- Comparative analysis of TOR's regulatory scope versus CDK's scope in cell division.
Main Results:
- The target of rapamycin (TOR) kinase regulates a broad and abundant set of cellular readouts.
- These TOR-controlled readouts are critical for various aspects of cell growth, including protein synthesis and metabolic processes.
- TOR's extensive regulatory network suggests a central role in coordinating cell mass increase.
Conclusions:
- The target of rapamycin (TOR) kinase is identified as a central regulator of cell growth.
- TOR acts as a key coordinator of cellular processes essential for increasing cell mass.
- This finding establishes TOR as a crucial counterpart to cyclin-dependent kinases in regulating fundamental cell behaviors.
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