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. 1968 Aug;96(2):409–420. doi: 10.1128/jb.96.2.409-420.1968

Roles of Arginine and Canavanine in the Synthesis and Repression of Ornithine Transcarbamylase by Escherichia coli

Ronald Faanes 1, Palmer Rogers 1
PMCID: PMC252313  PMID: 4877125

Abstract

Conditions were found under which the processes of repression and derepression of ornithine transcarbamylase were separated from the process of enzyme synthesis. After 10 min of arginine deprivation followed by the addition of 2 to 200 μg of l-arginine per ml, a number of strains of Escherichia coli exhibited a significant burst of ornithine transcarbamylase synthesis which lasted 3 to 4 min before the onset of repression. The rapid increase of enzyme activity was shown to require protein synthesis, and was not due to a slow uptake of arginine or induction of an arginine-inducible ornithine transcarbamylase. The capacity of E. coli to synthesize the burst of ornithine transcarbamylase reached a maximum after 10 min of arginine deprivation and then remained constant. The observed increase in enzyme synthesis may reflect the level of unstable messenger ribonucleic acid (RNA) for ornithine transcarbamylase present in the cell at the time protein synthesis was reinitiated. After the addition of arginine in the absence of protein synthesis, the burst of ornithine transcarbamylase decayed with a half-life of about 3 min. The data implied that arginine prevents synthesis of new messenger RNA that can translate this enzyme. Repression of ornithine transcarbamylase by l-canavanine (100 to 200 μg/ml) was observed, and no active enzyme was formed in the presence of this analogue. The action of canavanine as a repressor was distinguished from the inhibitory effect of this compound on protein synthesis.

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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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