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. 1980 Apr;142(1):202–211. doi: 10.1128/jb.142.1.202-211.1980

Gene expression in Escherichia coli after amino acid, purine, or pyrimidine exhaustion.

R M Blumenthal, P P Dennis
PMCID: PMC293931  PMID: 6154686

Abstract

Three strains of Escherichia coli B auxotrophic for leucine, guanine, or uracil were analyzed after exhaustion of the respective required nutrient from the growth medium. The pattern of transcription was analyzed by ribonucleic acid-deoxyribonucleic acid filter hybridization to specific deoxyribonucleic acid probes, and the pattern of translation was analyzed by autoradiography after the resolution of proteins on sodium dodecyl sulfate-polyacrylamide gels. The results obtained suggest the following conclusions. (i) Specific regulation of rpoBC transcription occurs at both the promoter (PL10) and the putative attenuator between rplL and rpoB. (ii) The stringent response of ribosomal protein gene expression to amino acid insufficiency is only partially mimicked by purine or pyrimidine insufficiency. (iii) Transcription initiation at PL10 decreases in response to guanine exhaustion, but in contrast increases significantly in response to uracil exhaustion. (iv) The expression of the induced lac operon is severely depressed during any of these exhaustions. These conclusions argue against simple models for regulation of ribonucleic acid polymerase production or promoter choice by the intracellular levels of its substrate nucleotides.

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Selected References

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