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Inhibitors of Viral Protein Synthesis01:30

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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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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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MicroRNA-based Regulation of Picornavirus Tropism
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New small-molecule inhibitors effectively blocking picornavirus replication.

Lauren A Ford Siltz1, Ekaterina G Viktorova1, Ben Zhang2

  • 1Department of Veterinary Medicine, University of Maryland, and Virginia-Maryland Regional College of Veterinary Medicine, College Park, Maryland, USA.

Journal of Virology
|July 11, 2014
PubMed
Summary
This summary is machine-generated.

Three novel kinase inhibitors effectively block picornavirus replication, with two compounds showing resistance to mutant emergence. One inhibitor provided partial protection in a mouse model, indicating potential for broad-spectrum antiviral development.

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Area of Science:

  • Virology
  • Drug Discovery
  • Molecular Biology

Background:

  • Picornaviruses cause various human diseases, but few antiviral drugs are available.
  • Developing effective antipicornavirus therapeutics is challenging due to rapid resistance development.

Purpose of the Study:

  • To identify and characterize novel compounds that inhibit picornavirus replication.
  • To evaluate the potential of these compounds as broad-spectrum antiviral agents.

Main Methods:

  • Screening a kinase inhibitor library against poliovirus, coxsackievirus B3, and encephalomyocarditis virus.
  • Utilizing an in vitro translation-replication system to analyze drug effects on viral life cycle stages.
  • Investigating drug resistance mechanisms through mutation analysis and host protein recruitment studies.
  • Evaluating one compound in a murine model of poliomyelitis.

Main Results:

  • Three compounds (A4(1), E5(1), E7(2)) were identified that inhibit picornavirus replication.
  • A4(1) inhibited both formation and function of replication complexes, while E5(1) and E7(2) primarily affected formation.
  • A resistant poliovirus strain (G5318A mutation in 3A protein) was identified for E7(2), suggesting a link to PI4KIIIβ-dependent pathways.
  • E7(2) and GW5074 interfered with viral polyprotein processing and membrane association.
  • Compound A4(1) demonstrated partial protection against paralysis in a mouse model.
  • No resistant mutants were isolated for A4(1) or E5(1) despite multiple attempts.

Conclusions:

  • Novel kinase inhibitors show potent antiviral activity against diverse picornaviruses.
  • Compounds E7(2) and GW5074 likely target viral-host interactions at membranes, affecting polyprotein processing.
  • The resistance profile suggests potential for developing broad-spectrum antivirals with high genetic barriers to resistance.
  • Further development of these compounds, particularly A4(1), is warranted for therapeutic applications.