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Viruses with RNA Genomes01:29

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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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Compositional complementarity between genomic RNA and coat proteins in positive-sense single-stranded RNA viruses.

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Researchers uncovered the physicochemical principles of RNA packaging in positive-sense single-stranded RNA viruses. Coat proteins bind genomic RNA at sites matching nucleobase density and affinity, guiding viral packaging.

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Area of Science:

  • Virology
  • Structural Biology
  • Biophysics

Background:

  • Positive-sense single-stranded RNA (+ssRNA) viruses package their genomic RNA (gRNA) using coat proteins (CPs).
  • The physicochemical basis governing specific gRNA/CP interactions during packaging remains largely undefined.

Purpose of the Study:

  • To elucidate the fundamental principles of gRNA/CP interactions in +ssRNA virus packaging.
  • To develop a predictive model for identifying gRNA/CP interaction sites across diverse +ssRNA viruses.

Main Methods:

  • High-resolution cryo-electron microscopy (cryo-EM) structure analysis of bacteriophage MS2.
  • Computational modeling using a linearly additive model and knowledge-based affinities to predict gRNA/CP interaction energies.
  • Large-scale prediction of gRNA/CP interaction sites for 1082 +ssRNA viruses.
  • Validation using SELEX and CLIP experimental data from 10 viruses.

Main Results:

  • MS2 gRNA/CP binding sites, including the packaging signal, correlate with matching gRNA nucleobase-density and CP nucleobase-affinity profiles.
  • The MS2 packaging signal represents a global minimum in predicted gRNA/CP interaction energy for unstructured RNA.
  • Predictions for 1082 +ssRNA viruses show high agreement with experimental data.
  • CPs frequently interact with autologous coding regions in gRNA, consistent with predicted energies and mRNA-protein interaction principles.

Conclusions:

  • A self-consistent framework for understanding +ssRNA virus packaging is established.
  • Interactions between unstructured gRNA and CPs are implicated as a key mechanism in viral packaging.
  • The study provides a predictive tool for identifying RNA-protein interaction sites in viruses.