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Related Concept Videos

Antimicrobial Proteins01:23

Antimicrobial Proteins

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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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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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan biosynthesis begins in...
Production of Pharmaceuticals01:30

Production of Pharmaceuticals

Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...

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Related Experiment Video

Updated: Jul 14, 2026

Production and Testing of Antimicrobial Peptides and Their Mimics
10:35

Production and Testing of Antimicrobial Peptides and Their Mimics

Published on: April 10, 2026

Improved antimicrobial peptides based on acyl-lysine oligomers.

Inna S Radzishevsky1, Shahar Rotem, Dmitry Bourdetsky

  • 1Department of Biotechnology & Food Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Nature Biotechnology
|May 29, 2007
PubMed
Summary

New peptidomimetic oligomers offer rapid, broad-spectrum bacterial killing in mice without inducing resistance. Their unique design enhances in vivo efficacy and safety, presenting a promising platform for novel peptide antibiotics.

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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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11:56

Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids

Published on: May 4, 2018

Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Drug Discovery

Background:

  • Conventional antimicrobial peptides often face challenges with in vivo efficacy and safety.
  • The emergence of antibiotic resistance necessitates the development of novel antibacterial agents.

Purpose of the Study:

  • To describe novel peptidomimetic oligomers with bactericidal properties.
  • To evaluate the in vivo efficacy, safety, and resistance potential of these oligomers.

Main Methods:

  • Synthesis of peptidomimetic oligomers incorporating acyl chains.
  • Assessment of bactericidal activity against a broad spectrum of bacteria in a mouse model.
  • Evaluation of hemolytic activity and induction of bacterial resistance.

Main Results:

  • The peptidomimetic oligomers demonstrated rapid, broad-spectrum bactericidal activity in vivo.
  • The compounds were nonhemolytic and did not induce the emergence of bacterial resistance.
  • Acyl chain incorporation prevented stable secondary structure formation, correlating with improved properties.

Conclusions:

  • Peptidomimetic oligomers offer a promising alternative to conventional antimicrobial peptides.
  • The design strategy is advantageous for developing safe and effective peptide antibiotics.
  • This platform facilitates the development of new treatments against bacterial infections.