title: Role of the glycine betaine and carnitine transporters in adaptation of Listeria monocytogenes to chill stress in defined medium.
abstract: The food-borne pathogen Listeria monocytogenes proliferates at refrigeration temperatures, rendering refrigeration ineffective in the preservation of Listeria-contaminated foods. The uptake and intracellular accumulation of the potent compatible solutes glycine betaine and carnitine has been shown to be a key mediator of the pathogen's cold-tolerant phenotype. To date, three compatible solute systems are known to operate in L. monocytogenes: glycine betaine porter I (BetL), glycine betaine porter II (Gbu), and the carnitine transporter OpuC. We investigated the specificity of each transporter towards each compatible solute at 4 degrees C by examining mutant derivatives of L. monocytogenes 10403S that possess each of the transporters in isolation. Kinetic and steady-state compatible solute accumulation data together with growth rate experiments demonstrated that under cold stress glycine betaine transport is primarily mediated by Gbu and that Gbu-mediated betaine uptake results in significant growth stimulation of chill-stressed cells. BetL and OpuC can serve as minor porters for the uptake of betaine, and their action is capable of providing a small degree of cryotolerance. Under cold stress, carnitine transport occurs primarily through OpuC and results in a high level of cryoprotection. Weak carnitine transport occurs via Gbu and BetL, conferring correspondingly weak cryoprotection. No other transporter in L. monocytogenes 10403S appears to be involved in transport of either compatible solute at 4 degrees C, since a triple mutant strain yielded neither transport nor accumulation of glycine betaine or carnitine and could not be rescued by either osmolyte when grown at that temperature.
authors.affiliation: Department of Food Science and Technology, University of California, Davis, California 95616, USA.
authors.forename: Apostolos S
authors.initials: AS
authors.lastname: Angelidis
authors.forename: Gary M
authors.initials: GM
authors.lastname: Smith
mesh_terms: D000222:Adaptation, Physiological; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D001622:Betaine / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D003080:Cold Temperature; D003470:Culture Media; D015964:Gene Expression Regulation, Bacterial; D018869:Heat-Shock Response; D008089:Listeria monocytogenes / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D009154:Mutation; D027701:Organic Cation Transport Proteins
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D003470:Culture Media; D027701:Organic Cation Transport Proteins; C492021:opuC protein, Listeria monocytogenes; D001622:Betaine