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AMP sensing by DEAD-box RNA helicases.

Andrea A Putnam1, Eckhard Jankowsky

  • 1Center for RNA Molecular Biology and Department of Biochemistry, School of Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USA.

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Adenosine monophosphate (AMP) signals cellular stress. Certain DEAD-box RNA helicases are inhibited by AMP, linking metabolic state directly to RNA metabolism.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cellular Metabolism

Background:

  • Cellular adenosine monophosphate (AMP) levels indicate metabolic status.
  • AMP concentrations rise during metabolic stress, like glucose deprivation in yeast.
  • DEAD-box RNA helicases are crucial for various RNA metabolic processes.

Purpose of the Study:

  • To investigate the effect of AMP on the activity of yeast DEAD-box RNA helicases.
  • To identify which DEAD-box helicases are sensitive to AMP.
  • To understand how AMP links cellular metabolic state to RNA metabolism.

Main Methods:

  • Enzymatic assays measuring RNA binding and unwinding activity of purified yeast DEAD-box helicases.
  • Testing the direct effect of AMP on helicase function.
  • Comparative analysis of AMP sensitivity across different DEAD-box helicases.

Main Results:

  • AMP potently inhibits RNA binding and unwinding by specific yeast DEAD-box helicases: Ded1p, Mss116p, and eIF4A.
  • AMP does not inhibit the yeast DEAD-box helicases Sub2p and Dbp5p.
  • AMP is not produced during ATP hydrolysis by the tested helicases.

Conclusions:

  • A subset of DEAD-box RNA helicases are directly regulated by cellular AMP levels.
  • These AMP-sensitive helicases can act as a direct link between cellular metabolic state and RNA metabolism.
  • This finding reveals a novel regulatory mechanism in eukaryotic gene expression and RNA processing.