title: A dynamic model of proteome changes reveals new roles for transcript alteration in yeast.
abstract: The transcriptome and proteome change dynamically as cells respond to environmental stress; however, prior proteomic studies reported poor correlation between mRNA and protein, rendering their relationships unclear. To address this, we combined high mass accuracy mass spectrometry with isobaric tagging to quantify dynamic changes in ~2500 Saccharomyces cerevisiae proteins, in biological triplicate and with paired mRNA samples, as cells acclimated to high osmolarity. Surprisingly, while transcript induction correlated extremely well with protein increase, transcript reduction produced little to no change in the corresponding proteins. We constructed a mathematical model of dynamic protein changes and propose that the lack of protein reduction is explained by cell-division arrest, while transcript reduction supports redistribution of translational machinery. Furthermore, the transient 'burst' of mRNA induction after stress serves to accelerate change in the corresponding protein levels. We identified several classes of post-transcriptional regulation, but show that most of the variance in protein changes is explained by mRNA. Our results present a picture of the coordinated physiological responses at the levels of mRNA, protein, protein-synthetic capacity, and cellular growth.
authors.affiliation: Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA.
authors.forename: M Violet
authors.initials: MV
authors.lastname: Lee
authors.forename: Scott E
authors.initials: SE
authors.lastname: Topper
authors.forename: Shane L
authors.initials: SL
authors.lastname: Hubler
authors.forename: James
authors.initials: J
authors.lastname: Hose
authors.forename: Craig D
authors.initials: CD
authors.lastname: Wenger
authors.forename: Joshua J
authors.initials: JJ
authors.lastname: Coon
authors.forename: Audrey P
authors.initials: AP
authors.lastname: Gasch
mesh_terms: D002853:Chromatography, Liquid; D020869:Gene Expression Profiling / Q000379:methods*; D015966:Gene Expression Regulation, Fungal; D008962:Models, Theoretical; D020411:Oligonucleotide Array Sequence Analysis; D009994:Osmolar Concentration; D020543:Proteome / Q000235:genetics / Q000378:metabolism*; D040901:Proteomics / Q000379:methods; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D053719:Tandem Mass Spectrometry
chemical_list: D020543:Proteome; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins