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Related Concept Videos

Viral Structure00:56

Viral Structure

Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
The Antiviral System of Bacteria and Archaea: CRISPR01:23

The Antiviral System of Bacteria and Archaea: CRISPR

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this defense.
Determinants of Bacterial Pathogenicity and Virulence01:20

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...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...

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Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy
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Targeting the Rift Valley Fever Virus Polymerase: Resistance Mechanisms and Structural Insights.

Michal Král'1,2, Amiyaranjan Das3,4, Tomáš Kotačka1,2

  • 1Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo n. 2, 166 10 Prague 6, Czech Republic.

ACS Infectious Diseases
|October 30, 2025
PubMed
Summary
This summary is machine-generated.

Researchers identified Rift Valley fever virus (RVFV) polymerase inhibitors with potential as antiviral therapies. Structural analysis revealed how mutations confer resistance, aiding future drug development against this significant arbovirus.

Keywords:
L proteinRift Valley fever virusantiviralspolymerase inhibitorsresistance mutationsstructural insights

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Area of Science:

  • Virology
  • Structural Biology
  • Drug Discovery

Background:

  • Rift Valley fever virus (RVFV) poses a significant threat to human and livestock health, causing severe disease and economic losses.
  • No approved preventive or therapeutic agents exist for human RVFV infections, highlighting an urgent need for novel treatments.
  • The RVFV L protein, a crucial viral polymerase, is a promising target for antiviral drug development due to its conserved structure and function.

Purpose of the Study:

  • To identify and characterize inhibitors of the RVFV L protein polymerase.
  • To investigate the mechanisms of resistance to these inhibitors.
  • To provide structural insights into RVFV L protein-inhibitor interactions.

Main Methods:

  • Screening of a polymerase inhibitor library against RVFV.
  • Validation using live virus assays and a minigenome luciferase reporter system.
  • Generation and characterization of resistance mutants, including cryo-electron microscopy of the RVFV L protein.

Main Results:

  • Identification of several compounds exhibiting inhibitory activity against RVFV polymerase.
  • Characterization of key mutations conferring resistance to inhibitors.
  • Determination of a 3.5 Å cryo-EM structure of the wild-type RVFV L protein, revealing insights into mutation-driven resistance mechanisms.

Conclusions:

  • The identified inhibitors show promise as potential antiviral agents against RVFV.
  • Understanding resistance mechanisms is crucial for designing effective and durable therapeutics.
  • The structural data provides a foundation for structure-based drug design targeting the RVFV L protein.