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Feedback regulation between autophagy and PKA.

Francisco Torres-Quiroz1, Marie Filteau, Christian R Landry

  • 1a Departamento de Bioquímica y Biología Estructural; División de Ciencia Básica; Instituto de Fisiología Celular; Universidad Nacional Autónoma de México ; México City , México.

Autophagy
|June 6, 2015
PubMed
Summary

Protein kinase A (PKA) regulates crucial cell functions, including autophagy. This study identified new genes controlling PKA activity, revealing complex feedback loops between PKA and autophagy.

Keywords:
PCA, protein-fragment complementation assayPKA, protein kinase ATORTOR, target of rapamycinautophagyfeedback regulationmethionineprotein acetylationprotein kinase A (PKA) pathway

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein kinase A (PKA) is a key regulator of cellular processes and homeostasis.
  • PKA directly influences autophagy, a fundamental cellular degradation process.
  • The precise mechanisms governing PKA regulation and its link to autophagy require further elucidation.

Purpose of the Study:

  • To identify novel genes that regulate Protein kinase A (PKA) activity.
  • To investigate the intricate relationship between PKA regulation and autophagy.
  • To uncover potential feedback mechanisms between PKA and autophagy.

Main Methods:

  • Development of a yeast reporter system to monitor PKA activity.
  • Systematic measurement of protein-protein interactions between PKA subunits.
  • Genetic screening in various yeast backgrounds to identify regulatory genes.

Main Results:

  • Identification of candidate genes affecting PKA regulation across diverse cellular processes.
  • Discovered regulators involved in autophagy, methionine biosynthesis, TORC signaling, protein acetylation, and DNA repair.
  • Evidence for extensive feedback loops involving PKA and its identified regulators.

Conclusions:

  • PKA plays a central role in a complex regulatory network with multiple feedback loops.
  • Autophagy appears to not only be regulated by PKA but also to signal back to PKA.
  • The identified genes provide new targets for understanding PKA and autophagy interplay.