Abstract
The transcription and translation of operons for arginine biosynthetic enzymes after arginine removal (arginine down shift) were studied in relA and relA+ strains of Escherichia coli. After arginine down shift, derepression of synthesis of the arginine biosynthetic enzymes ornithine carbamoyltransferase (argF) and argininosuccinate lyase (argH) began at about 15 min in relA+ cells but was delayed in relA cells for more than 2 h. However, both relA+ and relA cells accumulated high levels of argCBH mRNA, as shown by dot blot hybridization, after arginine down shift. After 15 min of arginine limitation, the proportion of ribosome-bound argCBH mRNA was equivalent in both relA+ and relA cells. During the 15 min after the arginine down shift, relA+ cells produced a significant burst of argF and argH enzyme synthesis when arginine was added back to the culture, whereas relA cells did not produce this burst of enzyme synthesis. The relA cells regained the ability to produce a burst of argF and argH enzyme synthesis when alpha-methylglucose-induced glucose starvation was combined with arginine limitation. Significant guanosine 5'-diphosphate 3'-diphosphate accumulated in relA cells under this condition. Our results support the view that during periods of severe amino acid limitation guanosine 5'-diphosphate 3'-diphosphate acts in some way to ensure the translation of argCBH mRNA.
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