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Related Concept Videos

Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or quantified.

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A Simple Biosensor-Based Assay for Quantitative Autoinducer-2 Analysis.

Marla Keizers1, Ulrich Dobrindt1, Michael Berger1

  • 1Institute of Hygiene, University of Münster, Münster 48149, Germany.

ACS Synthetic Biology
|January 28, 2022
PubMed
Summary
This summary is machine-generated.

We developed a new biosensor assay for quantifying autoinducer-2 (AI-2), a key bacterial signaling molecule. This sensitive and reliable method improves the study of bacterial communication and behavior.

Keywords:
autoinducer-2biosensorfluorescencequantification bioassayquorum sensingreal-time detection

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Bacteria utilize signaling molecules for gene regulation and community behavior.
  • Autoinducer-2 (AI-2) is crucial for interspecies communication between Gram-positive and Gram-negative bacteria.
  • Accurate AI-2 quantification is vital for understanding bacterial population dynamics and pathogenicity.

Purpose of the Study:

  • To develop a sensitive, robust, and cost-effective biosensor assay for AI-2 quantification.
  • To overcome limitations of existing AI-2 detection methods, such as complexity and narrow detection ranges.
  • To facilitate real-time analysis of AI-2 secretion in bacterial cocultures.

Main Methods:

  • Development of an *Escherichia coli* biosensor strain with an *lsr* promoter-fluorescent reporter gene fusion.
  • Chromosomal integration of the reporter cassette in the biosensor strain or its use in a low-copy number plasmid.
  • Application of calibration curves for absolute AI-2 concentration determination in cell-free samples.

Main Results:

  • The developed biosensor assay enables AI-2 quantification in a concentration range from 400 nM to 100 μM.
  • The assay is sensitive, fast, reliable, and robust, with minimal interference from growth media components.
  • Real-time coculture experiments demonstrated the capability and kinetics of AI-2 secretion by various Gram-negative bacteria.

Conclusions:

  • The novel biosensor assay significantly improves AI-2 detection and quantification.
  • This tool facilitates the study of bacterial interspecies communication and population density-dependent gene expression.
  • The method provides a reliable platform for analyzing AI-2 dynamics in complex bacterial systems.