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NMD takes two PIN domains to tango

Oliver Muhlemann1, Evangelos D Karousis2

  • 1Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, CH-3012 Bern, Switzerland oliver.muehlemann@unibe.ch.

RNA (New York, N.Y.)
|March 11, 2026
PubMed

Insights

Nonsense-mediated mRNA decay (NMD) involves SMG5 and SMG6 proteins. Their PIN domains interact, forming a catalytic site that initiates nonsense mRNA degradation.

Area of Science:

  • Molecular Biology
  • RNA Biology
  • Biochemistry

Background:

  • Nonsense-mediated mRNA decay (NMD) is a crucial surveillance pathway.
  • SMG5 and SMG6 are key proteins implicated in the NMD pathway.
  • The precise mechanism of NMD-mediated mRNA degradation requires further elucidation.

Purpose of the Study:

  • To investigate the interaction between SMG5 and SMG6 proteins.
  • To identify the catalytic site responsible for initiating nonsense mRNA degradation.
  • To elucidate the molecular mechanisms underlying NMD.

Main Methods:

  • Co-immunoprecipitation assays to study protein interactions.
  • In vitro assays to assess enzymatic activity.
  • Structural analysis of SMG5 and SMG6 domains.

Main Results:

  • The PIN domains of SMG5 and SMG6 were found to interact.
  • This interaction forms a composite catalytic site.
  • The identified composite site is responsible for the endonucleolytic activity that initiates nonsense mRNA degradation.

Conclusions:

  • SMG5 and SMG6 proteins physically interact through their PIN domains.
  • This interaction creates a functional catalytic site essential for NMD.
  • The findings reveal the molecular basis for the initiation of nonsense mRNA degradation in NMD.
Keywords:
NMDPIN domainSMG5SMG6composite catalytic site

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