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. 1989 Nov;86(21):8275–8279. doi: 10.1073/pnas.86.21.8275

In vivo synthesis of adenylylated bis(5'-nucleosidyl) tetraphosphates (Ap4N) by Escherichia coli aminoacyl-tRNA synthetases.

A Brevet 1, J Chen 1, F Lévêque 1, P Plateau 1, S Blanquet 1
PMCID: PMC298263  PMID: 2554306

Abstract

The role of aminoacyl-tRNA synthetases in the in vivo synthesis of adenylylated bis(5'-nucleosidyl) tetraphosphates (Ap4N) was studied by measuring the concentration of these nucleotides in Escherichia coli cells overproducing lysyl-, methionyl- phenylalanyl-, or valyl-tRNA synthetase. Overproduction of each aminoacyl-tRNA synthetase (20- to 80-fold) was accompanied by a significant increase in intracellular Ap4N concentration (3- to 14-fold). As expected, non-adenylylated bis(5'-nucleosidyl) tetraphosphate concentration was not changed by synthetase overproduction. It was also verified that overproduction of an inactive methionyl-tRNA synthetase mutant did not modify Ap4N concentration. Ap4N accumulation during heat shock occurred in all strains studied. The increase factor (approximately 50-fold after 1 hr at 48 degrees C) was not changed by overproduction of any of the aminoacyl-tRNA synthetases studied, including that of the heat-inducible form of lysyl-tRNA synthetase from the lysU gene. Together, these results establish that aminoacyl-tRNA synthetases are involved in Ap4N biosynthesis during exponential growth as well as during heat shock.

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Selected References

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