Results 141 to 150 of about 119,068 (185)

Reciprocal regulation of glutamine synthetase and carbamoylphosphate synthetase levels in rat liver

Biochimica Et Biophysica Acta Gene Regulatory Mechanisms, 1987
In glucocorticosteroid-treated diabetic rats, glutamine synthetase enzyme levels in the liver are decreased 3-fold, whereas carbamoylphosphate synthetase enzyme levels are increased 2.3-fold.
Wouter H Lamers, A F M Moorman, A F Moorman   +2 more
exaly   +2 more sources

GLUTAMINE SYNTHETASE ISOFORMS IN ALGAE

New Phytologist, 1986
The occurrence of glutamine synthetase isoforms in algae, from seven different phyla, has been investigated, using ion‐exchange chromatography. The algae have been classified into three groups according to their glutamine synthetase isoform content.
STEWART, G. R., CHANDLER, G., SUMAR, N., SHAH, N., CASSELTON, P. J.   +4 more
exaly   +2 more sources

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Congenital Glutamine Deficiency with Glutamine Synthetase Mutations

New England Journal of Medicine, 2005
Glutamine synthetase plays a major role in ammonia detoxification, interorgan nitrogen flux, acid-base homeostasis, and cell signaling. We report on two unrelated newborns who had congenital human glutamine synthetase deficiency with severe brain malformations resulting in multiorgan failure and neonatal death.
Johannes, Häberle, Boris, Görg, Frank, Rutsch, Eva, Schmidt, Annick, Toutain, Jean-François, Benoist, Antoinette, Gelot, Annie-Laure, Suc, Wolfgang, Höhne, Freimut, Schliess, Dieter, Häussinger, Hans G, Koch   +11 more
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Localisation of Glutamine Synthetase in Chloroplasts

Nature New Biology, 1973
Glutamine is of considerable importance in plants, as a readily metabolised and translocated intermediate and as a product of ammonia detoxification. Glutamine synthetase carries out the ATP-driven addition of ammonia to glutamate to produce the amide. The source of ATP and information on the metabolic role, for glutamine synthetase may be suggested by
D, O'Neal, K W, Joy
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Novel aspects of glutamine synthetase in ammonia homeostasis

Neurochemistry International, 2020
Elevated blood ammonia (hyperammonemia) is believed to be a major contributor to the neurological sequelae following severe liver disease. Ammonia is cleared via two main mechanisms, the urea cycle pathway and the glutamine synthetase reaction.
Bjørnar Hassel, Tore Eid, Yun Zhou
exaly   +2 more sources

Glutamine synthetase deadenylylating enzyme

Biochemical and Biophysical Research Communications, 1968
The glutamine synthetase of Escherichiacoli exists in various forms differing from each other by their content of covalently bound adenylyl groups (Shapiro etal., 1967;Wulff etal., 1967). The biosynthetic activity of unadenylylated glutamine synthetase is very much greater with Mg2+ as the activating cation than with Mn2+, and its γ-glutamyl ...
B M, Shapiro, E R, Stadtman
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Induction of glutamine synthetase by cortisol

Biochimica et Biophysica Acta (BBA) - General Subjects, 1968
Abstract A 2-fold increase in the activity of hepatic glutamine synthetase ( L -glutamate: ammonia ligase (ADP), EC 6.3.1.2) was observed following the administration of cortisol to adrenalectomized rats and this response was prevented by actinomycin D.
P N, Raina, F, Rosen
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Distribution of glutamine synthetase and an inverse relationship between glutamine synthetase expression and intramuscular glutamine concentration in the horse

Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 2008
Glutamine plays important roles in the interorgan transport of nitrogen, carbon and energy but little is known about glutamine metabolism in the horse. In this study we determined the tissue distribution of glutamine synthetase expression in three Standardbred mares.
Helio C, Manso Filho, Helena Emilia C, Costa, Yanxin, Wang, Kenneth H, McKeever, Malcolm, Watford   +4 more
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Regulation of Glutamine Synthetase Activity

EcoSal Plus, 2004
Detailed studies of the glutamine synthetase (GS) in Escherichia coli and other bacteria have shown that the activity of this enzyme is regulated by at least five different mechanisms: (i) cumulative feedback inhibition by multiple end products of glutamine metabolism, (ii) interconversion between taut and relaxed ...
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Conversion of glutamic acid to glutamine by retinal glutamine synthetase

Experimental Eye Research, 1973
Abstract There is a qualitative correlation within a given retinal tissue between level of glutamine synthetase, as measured by its transferase activity, and ability of the tissue to convert glutamic acid to glutamine in vitro. The present study shows this to be the case for age-dependent endogenous enzyme activity, cortisol-induced enzyme activity ...
L, Reif-Lehrer, J, Coghlin
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