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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,...

Bacterial Signaling

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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...

Regulation of Bacterial Virulence

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Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...

Prokaryotic Transcriptional Activators and Repressors

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

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DNA-affinity-purified Chip (DAP-chip) Method to Determine Gene Targets for Bacterial Two component Regulatory Systems

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Structural basis for antiactivation in bacterial quorum sensing.

Guozhou Chen¹, Philip D Jeffrey, Clay Fuqua

¹Department of Biology, Indiana University, 915 East Third Street, Bloomington, IN 47405, USA.

Proceedings of the National Academy of Sciences of the United States of America

|October 9, 2007

Summary

Bacteria use quorum sensing to coordinate behaviors. Researchers discovered how the TraM antiactivator binds TraR, preventing DNA binding and offering new ways to control microbial activities.

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Area of Science:

Microbiology
Structural Biology
Biochemistry

Background:

Bacteria coordinate behaviors using quorum sensing (QS) regulated by signal molecules.
LuxR-type transcription factors control QS in Gram-negative bacteria, responding to acylated homoserine lactones.
In rhizobia, TraR is a transcriptional activator, with TraM acting as an antiactivator.

Purpose of the Study:

To determine the 3D structure of the TraR-TraM antiactivation complex.
To elucidate the mechanism of antiactivation by TraM on TraR.

Main Methods:

X-ray crystallography was used to determine the 3D structure of the TraR-TraM complex.
Structural analysis of the complex interface.

Main Results:

The antiactivator TraM binds TraR at a site separate from its DNA-binding motif.
TraM binding induces an allosteric conformational change in TraR, inhibiting DNA binding.
A highly conserved TraR-TraM interface was identified.

Conclusions:

The study reveals the structural basis of TraR-TraM antiactivation, offering insights into transcriptional regulation.
This structural information may guide strategies to control QS-regulated microbial processes, including infectious diseases and antibiotic resistance.