Journal
RNA
Volume 23, Issue 6, Pages 866-871Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1261/rna.060764.117
Keywords
deadenylation; ATP; microRNA; Smaug; CCR4-NOT complex
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Funding
- Japan Society for the Promotion of Science [15H02382]
- JSPS Research Fellowship for Young Scientists [14J08195]
- Grants-in-Aid for Scientific Research [14J08195, 15H02382] Funding Source: KAKEN
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MicroRNAs (miRNAs), as well as the RNA-binding protein Smaug, recruit the CCR4-NOT deadenylase complex for shortening of the poly(A) tail. It has been believed that ATP is required for deadenylation induced by miRNAs or Smaug, based on the fact that the deadenylation reaction is blocked by ATP depletion. However, when isolated, neither of the two deadenylases in the CCR4-NOT complex requires ATP by itself. Thus, it remains unknown why ATP is required for deadenylation by ribonucleoprotein complexes like miRNAs and Smaug. Herein we found that, in the absence of the ATP-regenerating system, ATP is rapidly consumed into AMP, a strong deadenylase inhibitor, in Drosophila cell lysate. Importantly, hydrolysis of AMP was sufficient to reactivate deadenylation by miRNAs or Smaug, suggesting that AMP accumulation, rather than ATP depletion, caused the inhibition of the deadenylation reaction. Our results indicate that ATP is dispensable for deadenylation induced by miRNAs or Smaug and emphasize caution in the use of ATP depletion methods.
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