title: Multiple transcripts regulate glucose-triggered mRNA decay of the lactate transporter JEN1 from Saccharomyces cerevisiae.
abstract: The Saccharomyces cerevisiae JEN1 gene encoding the lactate transporter undergoes strong catabolic repression at both transcriptional and post-transcriptional levels. JEN1 mRNA decay is greatly accelerated upon the addition of a pulse of glucose, fructose or mannose to induced cell cultures. Mapping of the 5'UTRs and 3'UTRs of JEN1 transcripts revealed multiple transcription start-sites located at position -51, +391 or +972, depending on the cell culture conditions. The presence of the JEN1(+391) transcript correlated with rapid glucose-triggered mRNA degradation of the JEN1(-51) transcript, whereas when the small transcript started at position +972, the JEN1(-51) mRNA turnover rate was unaffected. Overexpressed JEN1(+391) transcript accelerated JEN1(-51) mRNA decay in all conditions tested but was not translated. We propose that the JEN1(+391) transcript may have a "sensor-like" function, regulating glucose-triggered degradation of JEN1(-51) protein-coding mRNA.
authors.affiliation: Centro de Biologia, Departamento de Biologia, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
authors.forename: R P
authors.initials: RP
authors.lastname: Andrade
authors.forename: P
authors.initials: P
authors.lastname: Kötter
authors.forename: K-D
authors.initials: KD
authors.lastname: Entian
authors.forename: M
authors.initials: M
authors.lastname: Casal
mesh_terms: D004305:Dose-Response Relationship, Drug; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects / Q000502:physiology*; D005947:Glucose / Q000494:pharmacology*; D027501:Monocarboxylic Acid Transporters / Q000235:genetics* / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism*; D027981:Symporters / Q000235:genetics* / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D015533:Transcriptional Activation / Q000187:drug effects / Q000502:physiology
chemical_list: C118697:JEN1 protein, S cerevisiae; D027501:Monocarboxylic Acid Transporters; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins; D027981:Symporters; D014157:Transcription Factors; D005947:Glucose