Glutamine Synthetase Regulation by Energy Charge in Sunflower Roots

Glutamine Synthetase Regulation by Energy Charge in Sunflower Roots Energy charge ((ATP) + ½ (ADP))/((ATP) + (ADP) + (AMP)) and glutamine synthetase activity (transferase reaction) of roots increase in a near congruent manner when decotyledonized sunflower plants ( Helianthus annuus L. var. Mammoth Russian) are grown in nitrate for 9 days. Replacement of nitrate with ammonium for the final 2 days leads to a higher energy charge and increased enzyme activity. Similar correlations occur when nitrate plants are placed on a zero nitrogen regimen and when they are subjected to continuous darkness. A rank order correlation of 0.72 is obtained for all data. Control concepts such as adenylylation-deadenylylation and ammonium inhibition of enzyme synthesis are not supported by the data. Energy charge-enzyme activity plots support the view that glutamine synthetase of sunflower roots is subject to control by end products of glutamine metabolism. Alanine appears to exert a modulating effect on the regulation of glutamine synthetase by energy charge. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Glutamine Synthetase Regulation by Energy Charge in Sunflower Roots

Mar 1, 1976

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Publisher
American Society of Plant Biologist
Copyright
Copyright © 1976 by the American Society of Plant Biologists
ISSN
1532-2548
eISSN
0032-0889
DOI
10.1104/pp.57.3.339
Publisher site
See Article on Publisher Site

Abstract

Energy charge ((ATP) + ½ (ADP))/((ATP) + (ADP) + (AMP)) and glutamine synthetase activity (transferase reaction) of roots increase in a near congruent manner when decotyledonized sunflower plants ( Helianthus annuus L. var. Mammoth Russian) are grown in nitrate for 9 days. Replacement of nitrate with ammonium for the final 2 days leads to a higher energy charge and increased enzyme activity. Similar correlations occur when nitrate plants are placed on a zero nitrogen regimen and when they are subjected to continuous darkness. A rank order correlation of 0.72 is obtained for all data. Control concepts such as adenylylation-deadenylylation and ammonium inhibition of enzyme synthesis are not supported by the data. Energy charge-enzyme activity plots support the view that glutamine synthetase of sunflower roots is subject to control by end products of glutamine metabolism. Alanine appears to exert a modulating effect on the regulation of glutamine synthetase by energy charge.

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