Results 181 to 190 of about 78,410 (212)

Pyropheophytin a accompanies pheophytin a in darkened light grown cells of Euglena [PDF]

, 1981
Rüdiger, W., Scheer, Hugo, Schiff, J. A., Schoch, S., Siegelmann, H. W.   +4 more
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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.
Annick Toutain, Frank Rutsch, Freimut Schliess, Antoinette Gelot, Dieter Häussinger, Wolfgang Höhne, Jean-François Benoist, Eva Schmidt, Boris Görg, Hans Georg Koch, Annie-Laure Suc, Johannes Häberle   +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
K. W. Joy, D. O'neal
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Glutamine synthetase and hepatocellular carcinoma

Clinics and Research in Hepatology and Gastroenterology, 2023
Glutamine synthetase (GS) is an enzyme that converts ammonia and glutamate to glutamine using adenosine triphosphate. GS is expressed in the brain, kidney, and liver tissues under normal physiological conditions. GS is involved in abnormal lipid metabolism of the liver by catalyzing de novo synthesis of glutamine, thereby inducing liver inflammation ...
Jinghua, Jiang, Yiting, Hu, Dazhang, Fang, JianSheng, Luo   +3 more
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Glutamine synthetase deficiency

2020
Prenatal onset malformations of the brain, seizures, necrolytic erythema of the skin, enteropathy with diarrhea, early neonatal death, and multiorgan failure or chronic encephalopathy and developmental delay, hyperammonemia, low concentration of glutamine in plasma and cerebrospinal fluid, and deficient activity of glutamine synthetase.
William L. Nyhan, Bruce A. Barshop, Georg F. Hoffmann, Aida Al-Aqeel   +3 more
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Inhibitors of Glutamine Synthetase

2002
Due to the chemical inertness of the N2 molecule, the availability of metabolically accessible inorganic nitrogen sources was a key limiting factor for plant life on earth. The large scale conversion of N2 into NH3 and NO 3 - and their use as nitrogen fertilizer has been an agricultural standard for less than a century.
Guenter Donn, Helmut Köcher
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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.
F. Rosen, P.N. Raina
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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 ...
Bennett M. Shapiro, Earl R. Stadtman
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Regulation of glutamine synthetase

Archives of Biochemistry and Biophysics, 1966
Abstract The glutamine synthetase of Escherichia coli, which is subject to cumulative feedback inhibition by eight different products of glutamine metabolism, is also regulated by repression. The enzyme is repressed by growth on media containing readily available nitrogen, such as yeast extract-peptone or high concentrations of ammonium salts.
Earl R. Stadtman, C.A. Woolfolk, B.M. Shapiro   +2 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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