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. 1982 Mar;149(3):1041–1049. doi: 10.1128/jb.149.3.1041-1049.1982

Regulation of purE transcription in a purE::lac fusion strain of Escherichia coli.

R A Levine, M W Taylor
PMCID: PMC216494  PMID: 7037738

Abstract

A purE::lac fusion strain was isolated by using a special Mu phage developed by M. Casadaban. In the presence of adenine (100 micrograms/ml), beta-galactosidase synthesis was repressed by greater than 90%. beta-Galactosidase activity could be detected 6 to 8 min after the removal of adenine and increased linearly for at least 20 min. purR- mutants were isolated and synthesized 1.7- to 1.8-fold-higher levels of beta-galactosidase compared with purR+ cells. Azaserine derepressed purE transcription approximately 1.7-fold by lowering purine nucleotide pools. Glutamine and pyrimidine supplementation or starvation had no effect on purE transcription. A comparison of the rate of de novo purine biosynthesis and purE transcription indicated that the in vivo rate of de novo purine biosynthesis was more sensitive to the inhibitory effects of adenine than was transcription at the purE locus.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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