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Related Concept Videos

Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
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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Related Experiment Video

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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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Identification and Characterization of a Metal Binding-Independent Rift Valley Fever Virus Endonuclease Inhibitor.

Cara D Kirby1, Gai Liu2, Farheen Fatma1

  • 1Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri 63110, United States.

ACS Infectious Diseases
|August 11, 2025
PubMed
Summary

Researchers discovered MBXC-4522, a novel inhibitor targeting the Rift Valley Fever Virus (RVFV) endonuclease (EndoN) domain. This compound shows potential for developing new antiviral therapies against RVFV and similar viruses.

Keywords:
Rift Valley Fever Virusantiviralbunyavirusendonuclease inhibitor

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Area of Science:

  • Virology
  • Antiviral Drug Discovery

Background:

  • Viral cap-snatching, mediated by the endonuclease (EndoN) domain, is crucial for viral replication and a key target for antiviral development.
  • The success of EndoN inhibitor XOFLUZA highlights the potential for targeting EndoN domains in negative-sense RNA viruses (NSVs), including Rift Valley Fever Virus (RVFV).

Purpose of the Study:

  • To identify novel inhibitors of the RVFV EndoN domain.
  • To characterize the mechanism of action of identified inhibitors.

Main Methods:

  • High-throughput FRET-based assay screening of over 20,000 compounds.
  • Biochemical characterization of inhibitor binding and activity.
  • Infectious assays using pathogenic RVFV strains.

Main Results:

  • MBXC-4522, a spiro piperidine pyrido pyridine, was identified as a potent RVFV EndoN inhibitor.
  • MBXC-4522 directly binds the RVFV EndoN domain, enhancing protein stability and inhibiting enzymatic activity.
  • MBXC-4522 functions via a metal-independent mechanism, distinct from XOFLUZA.
  • MBXC-4522 demonstrated efficacy in inhibiting pathogenic RVFV replication in infectious assays.

Conclusions:

  • MBXC-4522 is a promising RVFV EndoN inhibitor with a unique metal-independent mechanism.
  • Further hit-to-lead optimization and in vivo validation of MBXC-4522 are warranted for antiviral development.