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Related Concept Videos

Inhibitors of Gram-positive Cell Wall Synthesis01:23

Inhibitors of Gram-positive Cell Wall Synthesis

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...
Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

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...
Inhibitors of Bacterial DNA Synthesis01:28

Inhibitors of Bacterial DNA Synthesis

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 antibiotics are selectively...
Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
Biological Methods for Microbial Control01:28

Biological Methods for Microbial Control

Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
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
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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Related Experiment Video

Updated: Jul 4, 2026

Antibiotic Dereplication Using the Antibiotic Resistance Platform
10:49

Antibiotic Dereplication Using the Antibiotic Resistance Platform

Published on: October 17, 2019

L-type pyocins inhibit the BAM complex to kill without cell entry.

Fabian Munder1,2,3, Matthew D Johnson2,3, Imogen Samuels3

  • 1Department of Microbiology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia.

Nature Communications
|July 2, 2026
PubMed
Summary
This summary is machine-generated.

New protein antibiotics, L-type pyocins, kill Pseudomonas aeruginosa by targeting the cell surface’s β-barrel assembly machinery (BAM) complex. This discovery offers a novel strategy for developing effective antibiotics against challenging Gram-negative pathogens.

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Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth
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Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth

Published on: January 7, 2022

Related Experiment Videos

Last Updated: Jul 4, 2026

Antibiotic Dereplication Using the Antibiotic Resistance Platform
10:49

Antibiotic Dereplication Using the Antibiotic Resistance Platform

Published on: October 17, 2019

Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth
09:10

Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth

Published on: January 7, 2022

Area of Science:

  • Microbiology
  • Structural Biology
  • Drug Discovery

Background:

  • Gram-negative bacteria like Pseudomonas aeruginosa possess a challenging outer membrane barrier limiting antibiotic efficacy.
  • The β-barrel assembly machinery (BAM) complex is crucial for assembling outer membrane proteins in Gram-negative bacteria.

Purpose of the Study:

  • To investigate the mechanism of action of L-type pyocins against Pseudomonas aeruginosa.
  • To explore the potential of targeting the BAM complex as a novel antibiotic strategy.

Main Methods:

  • Single-particle cryo-electron microscopy to determine the structure of L-type pyocins bound to BamA.
  • Genetics, multi-omics (transcriptomics, proteomics), and cryo-electron tomography to analyze the cellular response to BAM inhibition.
  • In vitro assays to assess antibiotic activity and mechanism.

Main Results:

  • L-type pyocins inhibit the BAM complex at the cell surface by targeting BamA, without requiring cell entry.
  • BAM complex inhibition by L-type pyocins or darobactin triggers significant transcriptomic, proteomic, and morphological changes.
  • Inhibition of the BAM complex leads to loss of membrane integrity and cell death.

Conclusions:

  • The BAM complex is a validated target for antibiotics that act extracellularly.
  • L-type pyocins represent a promising class of antibiotics effective against Pseudomonas aeruginosa.
  • This study defines an engineerable system for developing novel antibiotics targeting the BAM complex.