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Arabidopsis TARGET OF RAPAMYCIN Interacts with RAPTOR, Which Regulates the Activity of S6 Kinase in Response to Osmotic Stress Signals
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Plant Cell
- Article date:
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February 1, 2006
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Copyright informationCopyright American Society of Plant Physiologists Feb 2006. Provided by ProQuest LLC. (Hide copyright information)
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TARGET OF RAPAMYCIN (TOR) kinase controls many cellular functions in eukaryotic cells in response to stress and nutrient availability and was shown to be essential for embryonic development in Arabidopsis thaliana. We demonstrated that Arabidopsis RAPTOR1 (a TOR regulatory protein) interacts with
the HEAT repeats of TOR and that RAPTOR1 regulates the activity of S6 kinase (S6K) in response to osmotic stress. RAPTOR1 also interacts in vivo with Arabidopsis S6K1, a putative substrate for TOR. S6K1 fused to green fluorescent protein and immunoprecipitated from tobacco (Nicotiana tabacum) leaves after transient expression was active in phosphorylating the Arabidopsis ribosomal S6 protein. The ...
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