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Related Concept Videos

Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
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Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
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Determinants of Bacterial Pathogenicity and Virulence

Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...

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Related Experiment Video

Updated: Jun 26, 2026

Production of Pseudotyped Particles to Study Highly Pathogenic Coronaviruses in a Biosafety Level 2 Setting
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Using Vesicular Stomatitis Virus as a Platform for Directed Protease Evolution.

Francesco Costacurta1,2, Stefanie Rauch1,2, Dorothee von Laer1

  • 1Institute of Virology, Medical University of Innsbruck, Innsbruck, Austria.

Current Protocols
|December 23, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a safe method to identify antiviral resistance mutations without using dangerous viruses. By employing a surrogate virus, researchers can study viral evolution and drug resistance effectively.

Keywords:
MproSARS‐CoV‐2coronavirusesevolutionprotease inhibitorsresistancevesicular stomatitis virus

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Area of Science:

  • Virology
  • Molecular Biology
  • Drug Discovery

Background:

  • Antiviral drugs are critical but face challenges from rapidly evolving viruses.
  • Studying viral resistance is vital for effective treatment but poses safety concerns with pandemic-potential viruses.
  • Gain-of-function research on highly pathogenic viruses requires stringent safety protocols.

Purpose of the Study:

  • To develop a safe protocol for selecting antiviral resistance mutations.
  • To provide a method for studying viral evolution and drug resistance without using infectious agents.
  • To establish a reliable sequencing pipeline for identifying resistance mutations.

Main Methods:

  • Utilized vesicular stomatitis virus (VSV) as a surrogate RNA virus platform.
  • Engineered VSV to incorporate transgenes from other viruses, creating functional dependence.
  • Applied antiviral selection pressure targeting transgenes to isolate resistance mutations.
  • Developed a high-throughput sequencing pipeline for mutation analysis.

Main Results:

  • Successfully demonstrated a method for selecting antiviral resistance mutations using a surrogate VSV system.
  • Generated a comprehensive protocol for directed evolution of viral resistance.
  • Established and validated a sequencing pipeline for efficient mutation identification.

Conclusions:

  • The VSV surrogate system offers a safe and effective alternative for studying antiviral resistance mechanisms.
  • This approach facilitates informed decision-making in antiviral drug development and treatment strategies.
  • The protocol and sequencing pipeline can accelerate research into viral evolution and drug resistance.