1887

Abstract

SUMMARY: Arginine hydroxamate inhibits the growth of From a large number of mutants isolated as resistant to this arginine analogue, 29 were chosen for further investigation. Most of these shared diminished ability to utilize arginine, citrulline and/or ornithine as sole nitrogen source. All 29 had reduced levels of the catabolic enzymes arginase and ornithine aminotransferase under various conditions in which these enzymes are induced in the parent. In some circumstances, five of the mutants also showed elevated levels of the biosynthetic enzyme ornithine carbamoyltransferase. On the basis of these data, the 29 mutants were divided into six phenotypic classes; in four of these, control of ornithine carbamoyltransferase was the same as in the wild type, while in the other two it was altered. It is suggested that the isolates carry regulatory mutations, and that certain of these may affect simultaneously the formation of arginine catabolic and biosynthetic enzymes. The implication of the latter is that in , as in yeast, controls of the catabolic and biosynthetic pathways are connected.

Single representatives of five of the phenotypic classes carry mutations conferring arginine hydroxamate resistance linked to by transduction with phage PBS1; this did not appear to be true for a representative of the sixth class.

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1977-05-01
2021-08-06
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