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. 1976 Apr;126(1):365–376. doi: 10.1128/jb.126.1.365-376.1976

Effect of arginine on the stability and size of argECBH messenger ribonucleic acid in Escherichia coli.

R A Krzyzek, P Rogers
PMCID: PMC233293  PMID: 770427

Abstract

The chemical stability of argECBH messenger ribonucleic acid (mRNA) produced by Escherichia coli was found to be unaltered during steady-state repression by arginine. During extreme arginine deprivation, the increase in argECBH mRNA stability was related to general effects of amino acid starvation on mRNA stability. Thus a mechanism whereby argECBH gene expression is regulated by altering the decay rate of this mRNA is not consistent with our data. Sucrose gradient analysis followed by hybridization revealed that both heavy (14S) and light (8S) components of argECBH mRNA were produced by cells of E. coli K-12 grown without arginine, whereas predominantly light (8S) mRNA was produced by cells grown with arginine. A functional argR gene and the EC portion of the argECBH cluster were found essential for the arginine restriction of heavy-mRNA production. Experiments suggest that light argECBH mRNA did not arise from heavy message, and 8u% of both light and heavy mRNA was found bound to ribosomes. The data appear most consistent with the notion that a second site of control by arginine regulates the amounts of light and heavy arginine mRNA in the cell either by early termination of transcription or by endonucleolytic processing. Consideration of these data in conjunction with those of the accompanying report (Krzyzek and Rogers, 1976) permits the tentative conclusion that light argECBH mRNA is not translated into active enzymes and is thus responsible for the discrepancy between the high content of hybridizable mRNA and low rates of enzyme synthesis found during arginine repression.

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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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