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Allosteric regulation of noncoding RNA function by microRNAs.

Carlos Gorbea1, Abdalla Elhakiem1, Demián Cazalla1

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Summary
This summary is machine-generated.

Herpesvirus saimiri noncoding RNAs (HSURs) interact with host microRNAs (miRNAs). MiR-142-3p allosterically regulates HSUR1 and HSUR2 activity, revealing a new miRNA-mediated gene regulation mechanism.

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Area of Science:

  • Molecular Biology
  • Virology
  • RNA Biology

Background:

  • Herpesvirus saimiri expresses noncoding RNAs HSUR1 and HSUR2.
  • These HSURs interact with host microRNAs (miRNAs) like miR-142-3p, miR-16, and miR-27.
  • HSUR1 and HSUR2 have distinct roles in miRNA binding and function, including miRNA degradation and mRNA repression.

Purpose of the Study:

  • To investigate the role of miR-142-3p in the function of HSUR1 and HSUR2.
  • To elucidate the mechanism by which miR-142-3p regulates HSUR activity.
  • To understand how miRNAs can modulate the function of viral noncoding RNAs.

Main Methods:

  • Coimmunoprecipitation experiments were used to study miRNA-HSUR interactions.
  • Functional assays were performed to assess the impact of miRNA binding on HSUR activity.
  • Engineering of HSURs to be regulated by different miRNAs was explored.

Main Results:

  • The interaction with miR-142-3p is essential for the activity of both HSUR1 and HSUR2.
  • miR-142-3p allosterically regulates the binding of miR-27 to HSUR1 and miR-16 to HSUR2.
  • HSUR binding to different miRNAs is not cooperative.
  • HSURs can be engineered for regulation by alternative miRNAs, suggesting miRNA identity is less critical than the regulatory interaction.

Conclusions:

  • A novel mechanism of allosteric regulation of noncoding RNA function by a host miRNA is described.
  • MicroRNAs can regulate gene expression through previously unrecognized pathways involving viral noncoding RNAs.
  • This study provides new insights into the complex interplay between viral and host noncoding RNAs.