title: Generation and maintenance of synchrony in Saccharomyces cerevisiae continuous culture.
abstract: Cultures of Saccharomyces cerevisiae grown continuously produce an autonomous oscillation in many metabolic outputs. The most conveniently measured variable, i.e., dissolved oxygen concentration, oscillates with a period of 40-55 min. Previously we have identified two compounds capable of resetting phase, acetaldehyde and hydrogen sulfide. The phase-response curves constructed for acetaldehyde show a strong (Type 0) response at 3.0 mM and a weak (Type 1) response at 1.0 mM. Ammonium sulfide phase-response curves (pulse injected at 1.0 microM and 3.0 microM) revealed that sulfide is only an effective perturbation agent when endogenous sulfide concentrations are at a maximum. Also only Type 1 phase responses were observed. When the phase-response curve for sulfite (at 3.0 M) was constructed, phase responses were at a maximum at 60 degrees, indicating the possible involvement of sulfite in cell synchronization. It is concluded that endogenously produced acetaldehyde and sulfite tune the oscillation of mitochondrial energization state whereas sulfide mediates population synchrony.
authors.affiliation: Faculty of Engineering, Science and Technology, South Bank University, 103 Borough Road, SE1 OAA, London, UK.
authors.forename: Douglas B
authors.initials: DB
authors.lastname: Murray
authors.forename: Robert R
authors.initials: RR
authors.lastname: Klevecz
authors.forename: David
authors.initials: D
authors.lastname: Lloyd
mesh_terms: D000079:Acetaldehyde / Q000378:metabolism / Q000494:pharmacology; D001683:Biological Clocks / Q000187:drug effects / Q000502:physiology*; D002455:Cell Division / Q000187:drug effects / Q000502:physiology*; D019069:Cell Respiration / Q000187:drug effects / Q000502:physiology*; D002478:Cells, Cultured / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004734:Energy Metabolism / Q000187:drug effects / Q000502:physiology*; D006862:Hydrogen Sulfide / Q000378:metabolism / Q000494:pharmacology; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D013440:Sulfides / Q000378:metabolism / Q000494:pharmacology; D013447:Sulfites / Q000378:metabolism / Q000494:pharmacology
chemical_list: D013440:Sulfides; D013447:Sulfites; C027711:ammonium sulfide; D000079:Acetaldehyde; D006862:Hydrogen Sulfide