title: The anatomy of microbial cell state transitions in response to oxygen.
abstract: Adjustment of physiology in response to changes in oxygen availability is critical for the survival of all organisms. However, the chronology of events and the regulatory processes that determine how and when changes in environmental oxygen tension result in an appropriate cellular response is not well understood at a systems level. Therefore, transcriptome, proteome, ATP, and growth changes were analyzed in a halophilic archaeon to generate a temporal model that describes the cellular events that drive the transition between the organism's two opposing cell states of anoxic quiescence and aerobic growth. According to this model, upon oxygen influx, an initial burst of protein synthesis precedes ATP and transcription induction, rapidly driving the cell out of anoxic quiescence, culminating in the resumption of growth. This model also suggests that quiescent cells appear to remain actively poised for energy production from a variety of different sources. Dynamic temporal analysis of relationships between transcription and translation of key genes suggests several important mechanisms for cellular sustenance under anoxia as well as specific instances of post-transcriptional regulation.
authors.affiliation: Institute for Systems Biology, Seattle, Washington 98103, USA.
authors.forename: Amy K
authors.initials: AK
authors.lastname: Schmid
authors.forename: David J
authors.initials: DJ
authors.lastname: Reiss
authors.forename: Amardeep
authors.initials: A
authors.lastname: Kaur
authors.forename: Min
authors.initials: M
authors.lastname: Pan
authors.forename: Nichole
authors.initials: N
authors.lastname: King
authors.forename: Phu T
authors.initials: PT
authors.lastname: Van
authors.forename: Laura
authors.initials: L
authors.lastname: Hohmann
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Martin
authors.forename: Nitin S
authors.initials: NS
authors.lastname: Baliga
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D019843:Archaeal Proteins / Q000096:biosynthesis; D004734:Energy Metabolism / Q000187:drug effects; D019617:Halobacterium salinarum / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D008954:Models, Biological; D010100:Oxygen / Q000378:metabolism* / Q000494:pharmacology; D014176:Protein Biosynthesis / Q000187:drug effects; D020543:Proteome; D014158:Transcription, Genetic / Q000187:drug effects