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Proc Natl Acad Sci U S A. 1980 Nov;77(11):6670-2.

Regulatory coupling of nitrate and sulfate assimilation pathways in cultured tobacco cells.

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1
W. Alton Jones Cell Science Center, Lake Placid, New York 12946.

Abstract

When cultured tobacco cells are provided growth-limiting concentrations of sulfur as sulfate, the rate of development of nitrate reductase (NADH:nitrate oxidoreductase, EC 1.6.6.1) is proportional to the initial sulfate concentration. When the cells are provided growth-limiting concentrations of nitrogen as nitrate, the rate of derepression of ATP sulfurylase (ATP:sulfate adenylyltransferase, EC 2.7.7.4) is proportional to the initial nitrate concentration. These results are taken to be indicative of a reciprocal regulatory coupling between the nitrate and sulfate assimilation pathways.

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