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Updated: Jun 14, 2025

Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy

Functional Imaging of Viral Transcription Factories Using 3D Fluorescence Microscopy

Published on: January 18, 2018

Visualizing Viral RNA Packaging Signals in Action.

Emma Wroblewski¹, Nikesh Patel¹, Abid Javed¹

¹Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, United Kingdom.

Journal of Molecular Biology

|August 30, 2024

Summary

This summary is machine-generated.

Satellite Tobacco Necrosis Virus-1

Keywords:

genome regulated virus assembly and infection molecular frustration packaging signals virus assembly

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Area of Science:

Virology
Structural Biology
Molecular Biology

Background:

Satellite Tobacco Necrosis Virus-1 (STNV-1) forms T=1 virus-like particles (VLPs).
Genome packaging in viruses is crucial for infection and assembly.

Purpose of the Study:

To investigate the role of packaging signals (PSs) in STNV-1 genome packaging.
To elucidate the mechanism of virus-like particle (VLP) assembly and genome extrusion.

Main Methods:

Genome-scale RNA fragments in assembly competition assays.
Asymmetric cryo-electron microscopy (cryo-EM) reconstructions.
Analysis of RNA-protein interactions and VLP structure.

Main Results:

Multiple packaging signals (PSs) on the STNV-1 genome make sequence-specific contacts with coat proteins (CPs), nucleating VLP formation.
CP N-terminal residues interact with gRNA PS loop sequences, explaining selective genome packaging.
Altered PS-CP affinity leads to asymmetric PS distribution within VLPs, influencing genome extrusion.
Genome folding and CP affinities dictate roles in virion assembly and infection.

Conclusions:

Differential packaging signal folding and coat protein affinities are critical for viral genome functions in assembly and infection.
The findings reveal a novel mechanism for genome extrusion regulated by RNA folding and VLP structure.
Conserved coat protein folds suggest these genome functions are widespread across many viruses.