title: Involvement of phospholipids in resistance and adaptation of Escherichia coli to acid conditions and to long-term survival.
abstract: In Escherichia coli membranes, three major phospholipids are formed: phosphatidylethanolamine (PE), phosphatidylglycerol (PG) and cardiolipin (CL). We report here the survival of mutants lacking either PE or both PG and CL at an acid pHo and during long-term survival experiments. Stationary phase cultures of E. coli lacking PE are much more sensitive to acid shock (pHo 3) than the wild-type strain. Moreover, in the strain lacking PE, long-term survival in stationary phase is impaired and after 5 days no viable cells are recovered. The survival of an exponential phase culture to acid shock is known to be increased if the culture is exposed to moderately acid conditions (pHo 5) prior to a shift to pHo 3. If either PE or both PG and CL are missing, the exposure to pHo 5 does not increase the survival at pHo 3.
authors.affiliation: Unité de Microbiologie et Génétique, UMR CNRS 5122, Bât A. Lwoff, Université Lyon 1, F-69622 Villeurbanne Cedex, France.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Canet
authors.forename: Martine
authors.initials: M
authors.lastname: Heyde
authors.forename: Raymond
authors.initials: R
authors.lastname: Portalier
authors.forename: Patrick
authors.initials: P
authors.lastname: Laloi
mesh_terms: D000222:Adaptation, Physiological; D010717:CDPdiacylglycerol-Serine O-Phosphatidyltransferase / Q000235:genetics / Q000378:metabolism; D002308:Cardiolipins / Q000502:physiology; D002462:Cell Membrane / Q000737:chemistry; D015169:Colony Count, Microbial; D004926:Escherichia coli / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D006863:Hydrogen-Ion Concentration; D016254:Mutagenesis, Insertional; D010714:Phosphatidylethanolamines / Q000502:physiology; D010715:Phosphatidylglycerols / Q000502:physiology; D010743:Phospholipids / Q000502:physiology*; D017855:Transferases (Other Substituted Phosphate Groups) / Q000235:genetics / Q000378:metabolism
chemical_list: D002308:Cardiolipins; D010714:Phosphatidylethanolamines; D010715:Phosphatidylglycerols; D010743:Phospholipids; D017855:Transferases (Other Substituted Phosphate Groups); C020676:CDP-diacylglycerol-glycerol-3-phosphate 3-phosphatidyltransferase; D010717:CDPdiacylglycerol-Serine O-Phosphatidyltransferase