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. 1977 Jun;130(3):1244–1252. doi: 10.1128/jb.130.3.1244-1252.1977

Independent Regulation of Transport and Biosynthesis of Arginine in Escherichia coli K-12

T F R Celis 1
PMCID: PMC235348  PMID: 324979

Abstract

From an arginine auxotrophic strain, a mutant was isolated which is able to utilize d-arginine as a source of l-arginine and shows a high sensitivity to inhibition of growth by canavanine. Transport studies revealed a four- to five-fold increased uptake of arginine and ornithine in cells from the mutant strain. The kinetics of entry of arginine and ornithine evidenced elevated maximal influx values for the arginine- and ornithine-specific transport systems. A close parallel between arginine transport activity and arginine binding activity with one arginine-specific binding periplasmic protein in the mutant strongly suggests that such binding protein is a component of the arginine-specific permease. The affinity between arginine and the binder, isolated from the mutant cells, as well as the electrophoretic mobility of the protein, remain unchanged. The enhanced transport activity of arginine and ornithine with mutant cells is insensitive to repression by arginine or ornithine, whereas the biosynthesis of arginine-forming enzymes is normally repressible. When transport activity was examined in strains with mutations leading to derepression of arginine biosynthesis, the regulation of arginine transport was found to be normal. These studies support the conclusion that arginine transport and arginine biosynthesis, in Escherichia coli K-12, are not regulated in a concerted manner, although both systems may have components in common.

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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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