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Bacterial Signaling

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...

Inducible Operons: lac Operon

Inducible Operons: lac Operon

The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...

Gene Regulation in Microbial Communities: Quorum Sensing

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,...

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Related Experiment Video

Updated: May 13, 2026

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria

Published on: June 28, 2018

Dissecting the quorum-sensing receptor LuxN.

Richard Bonneau¹

¹New York University Center for Comparative Functional Genomics, 100 Washington Sq. E., New York, NY, 10003, USA. bonneau@cs.nyu.edu

|August 12, 2008

Summary

Quorum sensing regulates bacterial behavior using secreted molecules and receptors. This study details the specific function of the LuxN receptor in Vibrio harveyi quorum sensing.

Area of Science:

Microbiology
Molecular Biology
Biochemistry

Background:

Quorum sensing is a cell-to-cell communication mechanism crucial for bacterial behavior.
This process involves secreted signaling molecules (autoinducers) and specific receptors.
Diverse signaling molecules and receptor systems mediate quorum sensing across bacterial species.

Discussion:

The study provides a site-specific analysis of the quorum-sensing receptor LuxN.
LuxN is a key component in the Vibrio harveyi quorum sensing system.
Understanding LuxN's function offers insights into bacterial communication.

Key Insights:

Detailed functional analysis of the Vibrio harveyi LuxN receptor.
Elucidation of specific molecular interactions within the quorum sensing pathway.

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Contribution to the understanding of bacterial signal transduction.

Outlook:

Potential for novel antimicrobial strategies targeting quorum sensing.
Further research into LuxN's structure-function relationship.
Broader implications for understanding bacterial communities and pathogenesis.