Multiple transcripts regulate glucose-triggered mRNA decay of the lactate transporter JEN1 from Saccharomyces cerevisiae

Biochem Biophys Res Commun. 2005 Jun 24;332(1):254-62. doi: 10.1016/j.bbrc.2005.04.119.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Dose-Response Relationship, Drug
  • Gene Expression Regulation, Fungal / drug effects
  • Gene Expression Regulation, Fungal / physiology*
  • Glucose / pharmacology*
  • Monocarboxylic Acid Transporters / genetics*
  • Monocarboxylic Acid Transporters / metabolism*
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism*
  • Saccharomyces cerevisiae / drug effects
  • Saccharomyces cerevisiae / physiology*
  • Saccharomyces cerevisiae Proteins / genetics*
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Symporters / genetics*
  • Symporters / metabolism*
  • Transcription Factors / genetics
  • Transcription Factors / metabolism*
  • Transcriptional Activation / drug effects
  • Transcriptional Activation / physiology


  • JEN1 protein, S cerevisiae
  • Monocarboxylic Acid Transporters
  • RNA, Messenger
  • Saccharomyces cerevisiae Proteins
  • Symporters
  • Transcription Factors
  • Glucose