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Related Concept Videos

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...
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,...
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Microbial Nutrition01:28

Microbial Nutrition

Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green sulfur bacteria, heliobacteria, and...
Microbial Interactions: Competition01:26

Microbial Interactions: Competition

Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...

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Related Experiment Video

Updated: Jun 1, 2026

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria
05:52

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

Published on: June 28, 2018

Light helps bacteria make important lifestyle decisions.

Mark Gomelsky1, Wouter D Hoff

  • 1Department of Molecular Biology, University of Wyoming, Laramie, WY 82071, USA. gomelsky@uwyo.edu

Trends in Microbiology
|June 14, 2011
PubMed
Summary

Bacteria use blue-light photoreceptors to switch between single-cell and biofilm lifestyles. This light sensing also influences pathogenic bacteria

Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Photobiology

Background:

  • Bacterial responses to light were previously considered limited to phototrophs.
  • Many bacteria, including chemotrophs, possess photoreceptor proteins, suggesting broader roles.
  • Blue-light receptors (LOV, BLUF, PYP) are increasingly recognized in diverse bacterial signaling pathways.

Purpose of the Study:

  • To review emerging trends in biological responses regulated by bacterial photoreceptors.
  • To explore how light sensing influences bacterial lifestyle choices.
  • To highlight the role of photoreceptors in pathogenic bacteria's host-association decisions.

Main Methods:

  • Literature review of studies on bacterial blue-light photoreceptors (LOV, BLUF, PYP).
  • Analysis of regulatory mechanisms, including two-component systems and cyclic di-GMP.

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Bioluminescent Bacterial Imaging In Vivo
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  • Examination of photoreceptor interactions with transcription factors and their impact on lifestyle.

    • Main Results:

    • Blue-light receptors regulate the transition between motile, single-cellular, and multicellular biofilm states.
    • Mechanisms involve bacterial two-component systems, cyclic di-GMP signaling, and direct transcription factor interactions.
    • Photoreception aids pathogenic bacteria in choosing between environmental and host-associated lifestyles.

    Conclusions:

    • Bacterial photoreceptors play a crucial role in lifestyle decisions beyond simple phototrophy.
    • Light sensing is a key factor in bacterial community formation and host-pathogen interactions.
    • Understanding these pathways offers insights into bacterial behavior and virulence.