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Related Concept Videos

Peptide Bonds02:43

Peptide Bonds

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Antimicrobial Effectiveness01:28

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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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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
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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Updated: Feb 2, 2026

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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Membrane targeting cationic antimicrobial peptides.

Daniela Ciumac1, Haoning Gong1, Xuzhi Hu1

  • 1Biological Physics Laboratory, School of Physics and Astronomy, University of Manchester, Schuster Building, Oxford Road, Manchester M13 9PL, UK.

Journal of Colloid and Interface Science
|November 16, 2018
PubMed
Summary

Antimicrobial peptides (AMPs) are promising agents against drug-resistant microbes. Rational design and biointerface studies enhance AMP efficacy and safety, with many now in clinical trials.

Keywords:
Antimicrobial peptidesAntimicrobial resistanceBiocompatibilityBiophysicsCationic peptidesLipid membraneNeutron reflectionPeptide amphiphilesPeptide surfactantsToxicity

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

  • Biochemistry
  • Materials Science
  • Microbiology

Background:

  • Antimicrobial peptides (AMPs) are naturally occurring or designed molecules that kill microorganisms.
  • Conventional antibiotics face challenges due to rising antimicrobial resistance.
  • Biomimetic and de novo designed AMPs offer tunable properties for therapeutic applications.

Purpose of the Study:

  • To review structural design approaches for AMPs.
  • To discuss lipid membrane models and characterization techniques in AMP development.
  • To highlight the link between molecular interactions and cellular responses for AMP efficacy and toxicity.

Main Methods:

  • Review of recent literature on AMP structural design.
  • Analysis of lipid monolayer and vesicle models for AMP interaction studies.
  • Examination of interfacial measurements and their correlation with bactericidal and cytotoxicity assays.

Main Results:

  • Rational AMP design optimizes structure-function relationships, overcoming limitations of natural AMPs.
  • Lipid membrane models provide insights into AMP selectivity and mechanisms of action.
  • Interfacial studies effectively bridge molecular-level understanding with cell-based efficacy and toxicity assessments.

Conclusions:

  • AMPs show significant potential as alternatives to conventional antibiotics, particularly in combating antimicrobial resistance.
  • Advanced design strategies and biointerface research are crucial for developing safe and effective AMPs.
  • Ongoing clinical trials underscore the therapeutic promise of AMPs across various applications.