Sensing the Reducing Power to Determine the Cell Fate: Flavin Redox-Switches in Signal Transduction

Area of Science:

• Microbiology
• Biochemistry
• Cell Biology

Background:

• Cellular redox balance is vital for bacterial metabolism, controlling anabolism, catabolism, and reactive oxygen species (ROS) production.
• Nutrient uptake and assimilation depend on electron acceptor availability for recycling reduced electron shuttles.
• High intracellular reducing power, especially in biofilms with oxygen gradients, can lead to ROS production and oxidative stress.

Purpose of the Study:

• To review the role of flavins in sensing cellular reducing power in bacteria.
• To discuss how bacteria adapt metabolism and behavior in response to reducing power.
• To explore the potential of targeting reducing power sensing for therapeutic interventions against biofilms.

Main Methods:

• Literature review focusing on flavin-mediated signal transduction pathways.
• Analysis of bacterial strategies for managing redox balance in varying environments.
• Discussion of electroceutical approaches for modulating bacterial reducing power.

Main Results:

• Flavins act as key signal transducers for sensing intracellular reducing power.
• Bacteria employ strategies like extracellular electron flux and biofilm morphology changes to manage redox homeostasis.
• Reducing power sensing influences cellular metabolism, ROS defense, and bacterial behaviors like chemotaxis and biofilm formation.

Conclusions:

• Sensing reducing power is a critical bacterial adaptation mechanism to environmental fluctuations and oxidative stress.
• Flavin-based systems are central to this sensing capability.
• Targeting these pathways offers potential for novel anti-biofilm and anti-infective strategies using electroceuticals.