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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
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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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Related Experiment Video

Updated: Jun 14, 2025

An Efficient Method for the Synthesis of Peptoids with Mixed Lysine-type/Arginine-type Monomers and Evaluation of Their Anti-leishmanial Activity
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Functionalized Phenyl Peptoids with Enhanced Antibacterial Potency.

Ghayah Bahatheg1,2, Rajesh Kuppusamy1,3, Muhammad Yasir3

  • 1School of Chemistry, The University of New South Wales (UNSW), Sydney, New South Wales 2052, Australia.

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

New peptoid compounds show strong antibacterial activity against resistant bacteria. These compounds target bacterial cell membranes and are effective against biofilms, offering potential as new antimicrobial agents.

Keywords:
antibacterials peptoidsantibiofilm peptoidsbiofilm inhibition and disruptionmembrane disruptionshort cationic molecules

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Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization
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Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization
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Area of Science:

  • Medicinal Chemistry
  • Biotechnology
  • Antimicrobial Research

Background:

  • Antimicrobial resistance (AMR) is a growing global health threat.
  • Peptoids, a class of peptidomimetics, show promise against multidrug-resistant bacteria due to their stability.
  • Previous research established the potential of dimeric peptoids.

Purpose of the Study:

  • To synthesize and evaluate novel functionalized phenyl-dimeric peptoids for antibacterial activity.
  • To investigate the influence of substituents and guanidino groups on antibacterial efficacy.
  • To explore the mechanism of action and safety profile of potent peptoids.

Main Methods:

  • Synthesis of 22 amino and guanidino functionalized phenyl-dimeric peptoids.
  • Determination of minimum inhibitory concentrations (MICs) against Gram-positive and Gram-negative bacteria.
  • Assessment of cytoplasmic membrane permeability, cell viability, and hemolysis.
  • Evaluation of biofilm inhibition and disruption.

Main Results:

  • Guanidino peptoids with electron-withdrawing or moderate electron-donating groups exhibited potent activity against *Staphylococcus aureus* and *Escherichia coli*.
  • MIC values ranged from 0.75 to 10.9 μg mL⁻¹.
  • Antibacterial effects are attributed to bacterial cell membrane damage.
  • Peptoids showed negligible hemolysis, indicating low mammalian toxicity.
  • Peptoid 11f demonstrated significant biofilm inhibition and disruption.

Conclusions:

  • Functionalized guanidino peptoids are effective against Gram-positive and Gram-negative bacteria.
  • These peptoids represent a promising new class of antimicrobial agents.
  • Potential applications include antibacterial surface coatings and therapeutic agents.