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Related Concept Videos

Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

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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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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Inhibitors of Bacterial DNA Synthesis01:28

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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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Chemicals play important roles in controlling microbial growth by targeting microbial structures and functions as sanitizers, antiseptics, disinfectants, and sterilants.Alcohols are commonly used sanitizers, effectively disrupting lipid membranes, which compromises cell integrity. They are also used as antiseptics and disinfectants due to their rapid action and versatility.Phenols and their derivatives phenolics , known for denaturing proteins and disrupting cell membranes, are particularly...
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Inhibitors of Gram-positive Cell Wall Synthesis01:23

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Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
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Updated: Mar 19, 2026

A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment
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A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment

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Ionomycin Exhibits Potent and Selective Bactericidal Activity Against Clostridioides difficile Through

Ahmed A Abouelkhair1,2, Nader S Abutaleb1,2,3, Mohamed N Seleem1,2

  • 1Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.

Microbiologyopen
|March 18, 2026
PubMed
Summary

Ionomycin, a microbial metabolite, effectively inhibits Clostridioides difficile growth and toxin production. This potent antibacterial agent shows selective activity and a unique calcium-dependent mechanism, offering a promising new therapeutic candidate.

Keywords:
C. difficile infectionbacterial membrane polarizationcalcium influxionophoresrepurposingtoxin inhibition

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Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291
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Culturing and Maintaining Clostridium difficile in an Anaerobic Environment
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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Drug Discovery

Background:

  • Clostridioides difficile infections (CDI) pose a significant global health threat due to high morbidity, mortality, and recurrent infections.
  • Current therapies for CDI are limited by resistance and recurrence, necessitating novel therapeutic agents.
  • There is an urgent need for selective antimicrobial agents targeting C. difficile.

Purpose of the Study:

  • To identify novel inhibitors of C. difficile from a microbial metabolite library.
  • To evaluate the efficacy and mechanism of action of ionomycin against C. difficile.
  • To assess the selectivity of ionomycin against gut microbiota.

Main Methods:

  • Screening of a microbial metabolite library against C. difficile.
  • Determination of minimum inhibitory concentrations (MIC50 and MIC90) for ionomycin.
  • Time-kill assays to assess bactericidal activity compared to vancomycin and fidaxomicin.
  • Evaluation of ionomycin's effect on toxin production and spore formation.
  • Assessment of ionomycin's activity against C. difficile spore germination.
  • Testing ionomycin's activity against representative gut microbiota strains.
  • Mechanistic studies involving calcium manipulation and membrane potential assays.

Main Results:

  • Ionomycin demonstrated potent activity against C. difficile isolates (MIC50 = 1 μg/mL, MIC90 = 2 μg/mL).
  • Rapid bactericidal activity was observed, surpassing vancomycin and fidaxomicin in time-kill assays.
  • Ionomycin reduced toxin production and spore formation at subinhibitory concentrations.
  • The compound effectively inhibited C. difficile spore germination and subsequent toxin production.
  • Ionomycin exhibited limited activity against gut microbiota, indicating favorable selectivity.
  • A calcium-dependent mechanism was elucidated, involving disruption of the C. difficile membrane potential.

Conclusions:

  • Ionomycin is a potent inhibitor of C. difficile with rapid bactericidal activity.
  • Its calcium-dependent mechanism and selective profile make it a promising therapeutic candidate for CDI.
  • Further investigation of ionomycin is warranted for its potential clinical application against C. difficile infections.