Regulatory Mechanisms in Escherichia coli Biofilm Formation

The formation of biofilms by Escherichia coli represents a multicellular lifestyle in which communities of cells adhere to surfaces and to each other within a self-produced matrix of extracellular polymeric substances. Key regulatory circuits orchestrate the transition from a motile planktonic state to a sessile biofilm state. Central to this regulation is the transcriptional activator CsgD, which induces production of curli fibres and cellulose, the principal components of the matrix. CsgD expression itself is controlled by environmental stimuli—nutrient availability, osmolarity, pH and temperature—via a network of two-component systems, alternative sigma factors and the global second messenger cyclic di-GMP. Sensor kinases transmit envelope stress and redox signals through two-component phosphorelays such as the Rcs system, modulating CsgD and exopolysaccharide synthesis accordingly. Fluctuations in cyclic di-GMP levels, mediated by diguanylate cyclases and phosphodiesterases, direct the switch between flagellar motility and adhesive behaviours. Quorum sensing and small RNAs integrate population density cues to fine-tune matrix production and dispersal. These multilayered regulatory mechanisms exhibit conservation across gram-negative bacteria but display species-specific adaptations in effector proteins and matrix composition. A detailed understanding of biofilm regulation has profound implications for combating persistent infections, improving industrial bioprocesses and designing anti-biofilm strategies in medical and environmental contexts.

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Regulatory Mechanisms in Escherichia coli Biofilm Formation publication trend

The graph below shows the total number of articles in regulatory mechanisms in escherichia coli biofilm formation across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm: A structured community of bacterial cells embedded in a self-produced matrix of extracellular polymeric substances.

Two-component system: A signalling module comprising a sensor histidine kinase and a response regulator that controls gene expression in response to environmental changes.

Rcs phosphorelay: A non-orthodox two-component signalling pathway in Enterobacteriaceae that responds to envelope stress to regulate capsule, curli and other surface structures.

Cyclic di-GMP: A ubiquitous bacterial second messenger that modulates the transition between motile and sessile lifestyles by regulating adhesin and exopolysaccharide synthesis.

Exopolysaccharide: High-molecular-weight sugar polymers secreted by bacteria that form the scaffold of the biofilm matrix.

References

1. Conformational rearrangements in the sensory RcsF/OMP complex mediate signal transduction across the bacterial cell envelope. PLOS Genetics (2023).
2. Enhanced Biofilm Formation by Escherichia coli LPS Mutants Defective in Hep Biosynthesis. PLOS ONE (2012).
3. New Insights into the Non-orthodox Two Component Rcs Phosphorelay System. Frontiers in Microbiology (2017).