Related Experiment Video

Updated: May 12, 2026

Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
11:56

Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection

Published on: October 25, 2013

Antagonistic self-sensing and mate-sensing signaling controls antibiotic-resistance transfer

Anushree Chatterjee1, Laura C C Cook, Che-Chi Shu

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 10, 2013
PubMed

Insights

Bacteria use conjugation to spread antibiotic resistance, creating superbugs. This study reveals a novel communication system in Enterococcus faecalis that uses two signals to control the spread of tetracycline resistance, offering potential clinical control strategies.

Area of Science:

  • Microbiology
  • Bacterial genetics
  • Molecular biology

Background:

  • Conjugation is a primary mechanism for bacterial antibiotic resistance acquisition.
  • Enterococcus faecalis is a significant nosocomial pathogen known for antibiotic resistance.
  • Plasmid transfer via conjugation facilitates the rapid spread of resistance genes.

Purpose of the Study:

  • To investigate the regulatory mechanisms of conjugative plasmid transfer in Enterococcus faecalis.
  • To elucidate the role of quorum sensing in controlling the spread of tetracycline resistance.
  • To identify potential targets for controlling antibiotic resistance transfer.

Main Methods:

  • Mathematical modeling of bacterial communication systems.
  • Experimental analysis of gene transfer dynamics.
  • Identification and characterization of signaling peptides involved in conjugation.

Main Results:

  • A unique quorum sensing system regulates the conjugative transfer of the tetracycline-resistance plasmid pCF10.
  • Two antagonistic signaling peptides control plasmid transfer based on cell density.
  • A 'self-sensing' peptide suppresses transfer at high donor cell densities.

Conclusions:

  • The identified quorum sensing system provides a novel mechanism for limiting plasmid spread.
  • Manipulation of these signaling pathways could offer strategies to combat antibiotic resistance.
  • Understanding intercellular communication is crucial for controlling the emergence of multidrug-resistant bacteria.

More Related Videos

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues07:10

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes08:58

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

Published on: March 3, 2023

Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
Transduction01:16

Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...
Development of Antibiotic Resistance01:30

Development of Antibiotic Resistance

Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
Antibiotic Selection00:57

Antibiotic Selection

Overview
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...
Bacterial Signaling01:30

Bacterial Signaling

Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...