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Related Experiment Videos

Eukaryotic RNA 5'-End NAD+ Capping and DeNADding.

Megerditch Kiledjian1

  • 1Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08854, USA.

Trends in Cell Biology
|March 17, 2018
PubMed
Summary
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Eukaryotic mRNAs possess a novel nicotinamide adenine dinucleotide (NAD+) cap, distinct from the traditional m7G cap. This NAD+ cap targets mRNA for rapid decay via the DXO enzyme, revealing a new gene expression control mechanism.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Metabolism

Background:

  • The 5'-end methylguanosine (m7G) cap is a well-established feature of eukaryotic messenger RNAs (mRNAs).
  • Recent discoveries reveal the existence of mRNAs with a nicotinamide adenine dinucleotide (NAD+) cap at their 5'-end in both yeast and mammalian cells.
  • This finding challenges the long-held understanding of mRNA capping and its regulatory roles.

Purpose of the Study:

  • To review the identification and characterization of the novel NAD+ cap in eukaryotic mRNAs.
  • To elucidate the mechanism of NAD+ cap addition to RNA.
  • To explore the functional significance of NAD+ capping in gene expression regulation, particularly mRNA turnover.

Main Methods:

  • Literature review of recent studies on mRNA capping.

Related Experiment Videos

  • Analysis of biochemical pathways involved in NAD+ cap formation.
  • Examination of enzymatic mechanisms, including the DXO decapping enzyme.

    • Main Results:

    • The NAD+ cap represents a new class of mRNA modifications in eukaryotes.
    • Unlike the stabilizing m7G cap, the NAD+ cap targets mRNA for rapid degradation.
    • The DXO enzyme plays a crucial role in removing the NAD+ cap through a process termed 'deNADding', leading to mRNA decay.

    Conclusions:

    • The NAD+ cap introduces a novel layer of gene expression control mediated by nucleotide metabolites.
    • NAD+ cap-mediated mRNA turnover offers a distinct regulatory pathway compared to m7G cap-dependent mechanisms.
    • Understanding deNADding and NAD+ capping is essential for comprehending cellular gene expression dynamics.