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Nascent peptides emerge as regulators of mRNA stability

Júlia Portell-Montserrat1, Markus Höpfler2

  • 1Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr Aiguader 88, Barcelona 08003, Spain.

Trends in Cell Biology
|July 17, 2026
PubMed

Insights

Phage protein AcrVA2 halts CRISPR-Cas12 activity by degrading mRNA as it is made. This discovery reveals a novel gene regulation mechanism involving nascent peptides in all life forms.

Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Mobile genetic elements and host genomes are in constant evolutionary conflict.
  • CRISPR-Cas systems provide adaptive immunity in prokaryotes.
  • Bacteriophages encode anti-CRISPR proteins to evade host defenses.

Purpose of the Study:

  • To investigate the anti-CRISPR mechanism of the phage protein AcrVA2.
  • To understand how AcrVA2 inhibits CRISPR-Cas12a activity.
  • To explore the potential role of nascent peptides in gene regulation.

Main Methods:

  • Biochemical assays to study AcrVA2-Cas12a interactions.
  • In vitro transcription-translation assays to monitor mRNA degradation.
  • Analysis of nascent peptide recognition by AcrVA2.

Main Results:

  • AcrVA2 directly recognizes the nascent Cas12a protein during translation.
  • This recognition triggers translation-coupled mRNA degradation.
  • AcrVA2 effectively inhibits CRISPR-Cas12a interference.

Conclusions:

  • AcrVA2 employs a novel anti-CRISPR strategy targeting nascent proteins.
  • Nascent peptides represent a previously unrecognized layer of gene regulation.
  • This mechanism has implications for understanding gene expression control across life.
Keywords:
CRISPR-Casanti-CRISPRgene regulationmRNA degradationprotein synthesisribosome

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