V. harveyi is Gram-negative, therefore it has a cell wall that consists of two membranes: an outer membrane made up of lipopolysaccharides and an inner cytoplasmic membrane. In between these is a periplasmic space housing a peptidoglycan layer. Vibrio harveyi is a facultative anaerobe, meaning it can swap between aerobic respiration of oxygen and fermentation in order to produce ATP. This characteristic helps V. harveyi survive in low oxygen concentrations, if fermentable material is present. V. harveyi has the ability of bioluminescence, which is controlled by the regulatory gene luxR as well as population density-sensing (quorum sensing) autoinducer signaling molecules. Expression occurs when the enzyme luciferace oxidizes an organic compound releasing free energy in the form of light. (Showalter, 1990)
Vibrio harveyi is known to regulate gene expression based on its population density. This is known as "Quorum-Sensing". This cell-to-cell communication ability is due to the release of autoinducers as a function of population in a given area and can occur between different bacterial species. Some examples of regulated activities based on quorum sensing include virulence, antibiotic production, biofilm formation, symbiosis, motility, and luminescence. V. harveyi actually produces two different autoinducer signals; one for intraspecies communication (denoted AI-1) and one for interspecies communication (AI-2). (Henke, 2004)
V. harveyi is Gram-negative, therefore it has a cell wall that consists of two membranes: an outer membrane made up of lipopolysaccharides and an inner cytoplasmic membrane. In between these is a periplasmic space housing a peptidoglycan layer. Vibrio harveyi is a facultative anaerobe, meaning it can swap between aerobic respiration of oxygen and fermentation in order to produce ATP. This characteristic helps V. harveyi survive in low oxygen concentrations, if fermentable material is present. V. harveyi has the ability of bioluminescence, which is controlled by the regulatory gene luxR as well as population density-sensing (quorum sensing) autoinducer signaling molecules. Expression occurs when the enzyme luciferace oxidizes an organic compound releasing free energy in the form of light. (Showalter, 1990)
Vibrio harveyi is known to regulate gene expression based on its population density. This is known as "Quorum-Sensing". This cell-to-cell communication ability is due to the release of autoinducers as a function of population in a given area and can occur between different bacterial species. Some examples of regulated activities based on quorum sensing include virulence, antibiotic production, biofilm formation, symbiosis, motility, and luminescence. V. harveyi actually produces two different autoinducer signals; one for intraspecies communication (denoted AI-1) and one for interspecies communication (AI-2). (Henke, 2004)
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