Open AccessRegulatory coupling of nitrate and sulfate assimilation pathways in cultured tobacco cells
Author(s) -
Ziva Reuveny,
Donald K. Dougall,
Philip M. Trinity
Publication year - 1980
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.77.11.6670
Subject(s) - derepression , sulfate , nitrate , nitrate reductase , nitrogen assimilation , chemistry , biochemistry , sulfur , assimilation (phonology) , oxidoreductase , enzyme , psychological repression , organic chemistry , gene expression , linguistics , philosophy , gene
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.