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Dual-function AzuCR RNA modulates carbon metabolism.

Medha Raina1, Jordan J Aoyama1,2, Shantanu Bhatt1

  • 1Division of Molecular and Cellular Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD 20892-5430.

Proceedings of the National Academy of Sciences of the United States of America
|March 3, 2022
PubMed
Summary

A novel small RNA molecule acts as a dual regulator, producing a protein that enhances enzyme activity while also inhibiting gene expression by binding to messenger RNAs (mRNAs). This dual function highlights the complex roles of noncoding RNAs in cellular processes.

Keywords:
HfqProQcatabolite repressionglycerol dehdrogenasesRNA

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Biology

Background:

  • Most small regulatory RNAs are considered noncoding, but some can also produce proteins.
  • Understanding the dual functions of these small RNAs is crucial for comprehending gene regulation.

Purpose of the Study:

  • To characterize a 164-nucleotide small RNA with dual regulatory functions.
  • To investigate the protein-coding and mRNA-binding activities of this small RNA.

Main Methods:

  • Described a 164-nucleotide RNA molecule.
  • Identified a 28-amino acid amphipathic protein encoded by the RNA.
  • Assessed the interaction of the protein with aerobic glycerol-3-phosphate dehydrogenase.
  • Analyzed the base-pairing of the RNA with two specific mRNAs.

Main Results:

  • The small RNA encodes a 28-amino acid protein that increases glycerol-3-phosphate dehydrogenase activity.
  • The RNA also base-pairs with two mRNAs, reducing their expression.
  • The protein-coding and mRNA-binding sequences within the RNA overlap.
  • The dual regulatory functions of the RNA are in competition.

Conclusions:

  • This study reveals a small RNA with a dual regulatory mechanism, acting as both a protein-coding and a gene-silencing molecule.
  • The overlapping sequences and competing functions highlight a novel layer of gene regulation.
  • These findings expand our understanding of the multifaceted roles of small RNAs in cellular control.