Related Experiment Video

Updated: May 27, 2026

Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System
05:06

Characterizing Multidrug Efflux Systems in Acinetobacter baumannii Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System

Published on: January 5, 2024

Providing β-lactams a helping hand: targeting the AmpC β-lactamase induction pathway

Brian L Mark1, David J Vocadlo, Antonio Oliver

  • 1Department of Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada. brian_mark@umanitoba.ca

Future Microbiology
|November 30, 2011
PubMed

Insights

Blocking bacterial cell wall repair can overcome antibiotic resistance. Targeting the peptidoglycan recycling pathway offers a new strategy against Gram-negative infections like Pseudomonas aeruginosa.

Area of Science:

  • Microbiology
  • Drug Discovery
  • Structural Biology

Background:

  • Broad-spectrum beta-lactam antibiotics often fail against Pseudomonas aeruginosa and Enterobacteriaceae due to AmpC beta-lactamase hyperproduction.
  • Chromosomal mutations affecting peptidoglycan (PG) recycling and its metabolic intermediates drive this resistance.
  • AmpC-producing bacterial mutants pose a significant clinical challenge.

Purpose of the Study:

  • To investigate potential drug targets in the Gram-negative PG recycling pathway.
  • To evaluate the efficacy of blocking PG recycling in overcoming AmpC-mediated antibiotic resistance.
  • To understand the structural and functional biology of key targets in this pathway.

Main Methods:

  • Analysis of structural and functional biology of proteins in the PG recycling pathway.
  • Investigating small-molecule inhibitors targeting PG recycling.
  • Assessing the impact of PG recycling inhibition on AmpC-mediated resistance in P. aeruginosa.

Main Results:

  • Identified potential drug targets within the Gram-negative PG recycling pathway.
  • Demonstrated the utility of blocking PG recycling in attenuating AmpC-mediated resistance.
  • Provided structural and functional insights into the targeted pathway.

Conclusions:

  • Inhibiting the peptidoglycan recycling pathway is a promising strategy to combat AmpC-mediated antibiotic resistance.
  • This approach could restore the efficacy of beta-lactam antibiotics against resistant Gram-negative bacteria.
  • Further research into these targets may lead to novel therapeutic interventions.

More Related Videos

The Use of a β-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions08:06

The Use of a β-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions

Published on: February 1, 2018

Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance09:00

Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance

Published on: May 2, 2018

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...
Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
Production of Antibiotics01:27

Production of Antibiotics

Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

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.
Such synergistic combinations...
Antibiotic Selection00:57

Antibiotic Selection

Overview