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Published on: November 8, 2006
Kelch repeat proteins control yeast PKA activity in response to nutrient availability.
Roli Budhwar1, Guoqiang Fang, Jeanne P Hirsch
1Department of Pharmacology and Systems Therapeutics, Mount Sinai School of Medicine, New York, NY, USA.
Budding yeast protein kinase A (PKA) activity is modulated by nutrient availability through Gpb1/Gpb2 proteins. These proteins indirectly affect the PKA regulatory subunit Bcy1 stability and phosphorylation.
Area of Science:
- Molecular Biology
- Cellular Regulation
- Biochemistry
Background:
- Protein Kinase A (PKA) activation is typically regulated by cyclic AMP (cAMP) binding to its regulatory subunit.
- Recent findings indicate PKA activity in budding yeast is also modulated by nutrient availability.
- This nutrient-dependent regulation involves the proteins Gpb1 and Gpb2, characterized by kelch repeats.
Purpose of the Study:
- To investigate the novel nutrient-dependent regulatory mechanism of PKA in budding yeast.
- To elucidate the role of Gpb1 and Gpb2 proteins in modulating PKA activity.
- To understand how Gpb1 and Gpb2 influence the stability and phosphorylation of the PKA regulatory subunit, Bcy1.
Main Methods:
- Analysis of protein stability and phosphorylation.
- Investigating the interaction between Gpb1/Gpb2 and PKA subunits.
- Utilizing budding yeast as a model organism.
Main Results:
- Gpb1 and Gpb2 proteins increase the stability and phosphorylation of Bcy1 under low glucose conditions.
- Phosphorylation of Bcy1 at serine-145 is critical for its stability.
- Phosphorylation events at serine residues 74-84 of Bcy1 correlate with nutrient availability.
- Data suggests Gpb1 and Gpb2 indirectly impact Bcy1 via effects on PKA catalytic subunits.
Conclusions:
- Gpb1 and Gpb2 mediate nutrient-dependent regulation of PKA in budding yeast.
- The regulatory mechanism involves indirect effects on the PKA regulatory subunit Bcy1.
- This study provides insights into a novel layer of PKA regulation linked to nutrient sensing.
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