Transcriptional control of the isoleucine-valine messenger RNA's in E. coli K-12

Geoffrey J. Childs, Martin Freundlich

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Hybridization of messenger ribonucleic acid (mRNA) isolated from Escherichia Coli K-12 to deoxyribonucleic acid (DNA) from λCI857st68h80dilv was used to detect isoleucine-valine (ilv) specific mRNA. A number of strains partially constitutive for the isoleucine-valine enzymes had levels of ilv mRNA 2 to 3-fold higher than the parent strain. Starvation for any of the branched-chain amino acids resulted in a 20 to 23-fold increase in ilv mRNA as compared to repressed levels. These differences were not due to altered growth rates or to changes in the stability of ilv mRNA. These data indicate that regulation of the isoleucine-valine enzymes by multivalent repression occurs mainly at the level of transcription. Kinetics of elongation of ilv mRNA after repression are consistent with the assumption that the mechanism of multivalent repression involves the prevention of further initiations by RNA polymerase.

Original languageEnglish (US)
Pages (from-to)257-268
Number of pages12
JournalMGG Molecular & General Genetics
Volume138
Issue number3
DOIs
StatePublished - Sep 1975
Externally publishedYes

Fingerprint

Isoleucine
Valine
Escherichia coli
Messenger RNA
RNA
Enzyme Repression
Branched Chain Amino Acids
DNA-Directed RNA Polymerases
Starvation
DNA
Enzymes
Growth

ASJC Scopus subject areas

  • Genetics

Cite this

Transcriptional control of the isoleucine-valine messenger RNA's in E. coli K-12. / Childs, Geoffrey J.; Freundlich, Martin.

In: MGG Molecular & General Genetics, Vol. 138, No. 3, 09.1975, p. 257-268.

Research output: Contribution to journalArticle

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