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Related Concept Videos

Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

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Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Stalling the Enemy: Targeting Nsp13 for Next-Generation SARS-CoV-2 Antivirals.

Jose M Castro1,2, Ryan L Slack1,2, Yee T Ong1,2

  • 1Center for ViroScience and Cure, Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA.

International Journal of Molecular Sciences
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

Researchers identified novel compounds targeting the SARS-CoV-2 nonstructural protein 13 (nsp13) RNA helicase. These inhibitors show promise for developing new antiviral therapies against emerging drug-resistant coronavirus strains.

Keywords:
HDXHTSNsp13SARS-CoV-2antiviralhelicasereplicon

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Area of Science:

  • Virology
  • Drug Discovery
  • Biochemistry

Background:

  • The emergence of drug-resistant SARS-CoV-2 strains necessitates novel antiviral therapeutics targeting essential viral proteins.
  • The SARS-CoV-2 nonstructural protein 13 (nsp13) RNA helicase is crucial for viral replication and a promising drug target.

Purpose of the Study:

  • To identify inhibitors of the SARS-CoV-2 nsp13 RNA helicase.
  • To characterize potential antiviral compounds targeting nsp13.

Main Methods:

  • Ultra-high-throughput nucleic acid unwinding assay screening of FDA-approved drugs and bioactive compounds.
  • Biochemical, biophysical characterization, and Hydrogen-deuterium exchange Mass Spectrometry (HDX-MS) studies.
  • Antiviral activity testing against infectious SARS-CoV-2 in cell lines.

Main Results:

  • Forty nsp13 inhibitors were identified with IC50 values between 1.4 and 10 μM.
  • Four compounds demonstrated nsp13 binding without affecting nucleic acid substrate or ATPase activity.
  • HDX-MS revealed compound-induced conformational changes in nsp13.
  • Identified compounds exhibited antiviral activity against SARS-CoV-2, though cytotoxicity was observed in some cases.

Conclusions:

  • Novel nsp13 inhibitors were discovered, offering a new avenue for antiviral drug development.
  • These compounds show potential for therapeutic strategies against current and future coronavirus threats.
  • Further optimization is needed to enhance efficacy and mitigate cytotoxicity for clinical application.