Search results
Results from the WOW.Com Content Network
In biology, quorum sensing or quorum signaling (QS) [1] is the process of cell-to-cell communication [2] that allows bacteria to detect and respond to cell population density by gene regulation, typically as a means of acclimating to environmental disadvantages.
Interspecies quorum sensing is a type of quorum sensing in which bacteria send and receive signals to other species besides their own. This is accomplished by the secretion of signaling molecules which trigger a response in nearby bacteria at high enough concentrations.
The minimum quorum sensing circuit in Gram-negative bacteria consists of a protein that synthesizes an AHL and a second, different protein that detects it and causes a change in gene expression. [4] First identified in V. fischeri , these two such proteins are LuxI and LuxR, respectively.
Bacterial quorum signalling begins with the N-AHLs secreted into the environment. In the process of quorum sensing, first the LuxI protein synthesizes an acylated homoserin-lactone molecule which can pass through cell membrane along the gradient through diffusion to the environmental space.
Bacterial quorum sensing. Bioluminescence in bacteria can be regulated through a phenomenon known as autoinduction or quorum sensing. [4] Quorum sensing is a form of cell-to-cell communication that alters gene expression in response to cell density.
Quorum sensing bacteria within the human microbiome are responsible for many diseases including sinusitis, [11] otitis media, [11] [12] pneumonia, [11] bacteraemia, [13] osteomyelitis, septic arthritis, and meningitis. [14] In the United States alone there is a death toll of >22,000 a year tracing back to this pathogen. [15]
The bacterium is a key research organism for examination of microbial bioluminescence, quorum sensing, and bacterial-animal symbiosis. [5] It is named after Bernhard Fischer, a German microbiologist. [6] Aliivibrio fischeri is the family Vibrionaceae. This family of bacteria tend to have adaptable metabolisms that can adjust to diverse ...
P. aeruginosa is a gram-negative bacteria and opportunistic human pathogen that can cause serious and sometimes fatal infections in humans. [2] Similar to other bacterial species, P. aeruginosa uses quorum sensing (QS) systems to communicate between cells in a population. [1]