Acyl-homoserine lactone degrading marine bacteria: Do they exist?

Acyl-homoserine lactones (acyl-HSL) are small molecules that are used in density dependent regulation in some bacteria. These molecules freely diffuse from the cell into the outside environment. Hence, it may be advantageous for other bacteria to utilize these molecules as a carbon source. The aim of this study is to look for acyl-HSL-utilizing bacteria in the marine environment. One strain, a Pirulella like bacterium, has been isolated in (almost) pure culture. This bacterium forms rosettes of ovoid cells. It can use acyl-HSL as a sole carbon and nitrogen source. Growing this strain in the presence of ampicillin demonstrate its lack of peptidoglycan in its cell wall, a feature consistent with its placement in the order Planctomycales.