Quorum Sensing
•Cell density dependent
gene expression
Example: Vibrio fischeri
[density dependent
bioluminscence]
The lux Operon
LuxI metabolism
à autoinducer (VAI)
luxR
luxI
luxC
luxD
luxA
luxB
luxE
luxG
LuxR
LuxI
(Light)
hv
Luciferase
P
P
Regulatory
Genes
Structural
Genes