PMID: 4897202Jun 1, 1969Paper

Carabolite repression of the lac operon. Repression of translation

The Biochemical Journal
M D. Yudkin, V Moses

Abstract

1. Experiments were devised to show whether catabolite repression of beta-galactosidase synthesis operates at the level of transcription or of translation. Escherichia coli K12 was induced for a short period in non-repressing medium (glycerol-minimal medium), and transcription of the lac operon was terminated by either of two methods; glucose was then added as a source of the catabolite repressor during the subsequent translation of the accumulated beta-galactosidase messenger RNA. 2. When induced bacteria in glycerol medium were infected with T6 phage, which is known to halt transcription, the addition of glucose up to 3min. later diminished the yield of beta-galactosidase. 3. When induced bacteria in glycerol medium were removed from the inducer and resuspended in fresh medium (a process that is also known to halt transcription), the yield of enzyme was again diminished by the presence of glucose in the resuspension medium. 4. It is concluded that repression of beta-galactosidase synthesis can be brought about by the presence of glucose during the translation phase only. 5. In E. coli strain 300U the effect on translation was sufficient to account for almost all the catabolite repression of beta-galactosidase synthesis observ...Continue Reading

Citations

Feb 1, 1972·European Journal of Biochemistry·J M RamírezF F Del Campo
Oct 18, 1976·Molecular & General Genetics : MGG·C Sanchez de Rivas, B S Méndez
Jan 1, 1971·Folia Microbiologica·L R Mann, V Moses
Mar 10, 1971·Nature: New Biology·H E VarmusI Pastan
Apr 15, 1970·Biochimica Et Biophysica Acta·R A de Kroon, V V Koningsberger
Dec 1, 1972·Journal of Bacteriology·A E Silverstone, B Magasanik

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