LasI/LasR Quorum Sensing Mechanism in Pseudomonas aeruginosa - Molecular Regulation Explained #2294693 (License: Personal Use)

This schematic illustrates the canonical LasI/LasR quorum sensing circuit in Pseudomonas aeruginosa, where LasI produces the diffusible autoinducer 3OC12-HSL (shown as blue droplets). Upon reaching threshold concentration, 3OC12-HSL binds cytoplasmic LasR, forming a complex that activates promoters (e.g., pTetR and pLas) driving expression of downstream genes such as B0034 and B0014. The system exemplifies density-dependent gene regulation critical for biofilm formation and virulence.

Used in microbiology education, research presentations, and scientific review articles to explain bacterial cell-to-cell communication; targets students, researchers, and clinicians seeking mechanistic insight into P. aeruginosa pathogenesis.