title: Functional linkage between genes that regulate osmotic stress responses and multidrug resistance transporters: challenges and opportunities for antibiotic discovery.
abstract: All cells need to protect themselves against the osmotic challenges of their environment by maintaining low permeability to ions across their cell membranes. This is a basic principle of cellular function, which is reflected in the interactions among ion transport and drug efflux genes that have arisen during cellular evolution. Thus, upon exposure to pore-forming antibiotics such as amphotericin B (AmB) or daptomycin (Dap), sensitive cells overexpress common resistance genes to protect themselves from added osmotic challenges. These genes share pathway interactions with the various types of multidrug resistance (MDR) transporter genes, which both preserve the native lipid membrane composition and at the same time eliminate disruptive hydrophobic molecules that partition excessively within the lipid bilayer. An increased understanding of the relationships between the genes (and their products) that regulate osmotic stress responses and MDR transporters will help to identify novel strategies and targets to overcome the current stalemate in drug discovery.
authors.affiliation: National Institute of Allergy and Infectious Diseases, Division of Extramural Activities, Bethesda, Maryland, USA.
authors.forename: B Eleazar
authors.initials: BE
authors.lastname: Cohen
mesh_terms: D000666:Amphotericin B / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001692:Biological Transport; D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism; D017576:Daptomycin / Q000494:pharmacology; D055808:Drug Discovery; D024901:Drug Resistance, Multiple, Bacterial / Q000235:genetics*; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D008563:Membrane Lipids / Q000737:chemistry; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics* / Q000378:metabolism; D064587:Osmoregulation / Q000235:genetics*; D009997:Osmotic Pressure
chemical_list: D000666:Amphotericin B; D000900:Anti-Bacterial Agents; D017576:Daptomycin; D008563:Membrane Lipids; D027425:ATP-Binding Cassette, Sub-Family C Proteins