Results 191 to 200 of about 200,780 (234)
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The optical specificity of glutamine synthetase
Archives of Biochemistry and Biophysics, 1960The optical specificity of the glutamine synthetase isolated from dried peas has been studied. The degree of optical specificity shown by the enzyme is a function of the pH, the activating meta-lion concentration, the metal-ion species and the concentration of ammonia or hydroxylamine.
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Conversion of glutamic acid to glutamine by retinal glutamine synthetase
Experimental Eye Research, 1973Abstract 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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Regulation of Glutamine Synthetase Activity
EcoSal Plus, 2004Detailed 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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Glutamine synthetase in the avian diencephalon
Journal of Experimental Zoology, 1973AbstractGlutamine synthetase (GS) activities are high in the nucleus rotundus of the avian diencephalon in late embryos and hatched chicks. The nucleus rotundus is known to be one component of a visual pathway in birds involving also the neural retina, the optic tectum and the cerebral ectostriatum.
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International Journal of Molecular Sciences
Alanine and glutamine are the principal glucogenic amino acids. Most originate from muscles, where branched-chain amino acids (valine, leucine, and isoleucine) are nitrogen donors and, under exceptional circumstances, a source of carbons for glutamate ...
M. Holeček
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Alanine and glutamine are the principal glucogenic amino acids. Most originate from muscles, where branched-chain amino acids (valine, leucine, and isoleucine) are nitrogen donors and, under exceptional circumstances, a source of carbons for glutamate ...
M. Holeček
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Inhibitors of Glutamine Synthetase
2002Due 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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Glutamine synthetase deficiency
2020Prenatal 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 +3 more
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Journal of Bacteriology, 1967
The relationships of five feedback inhibitors for the Bacillus licheniformis glutamine synthetase were investigated. The inhibitors were distinguishable by differences in their competitive relationship for the substrates of the enzyme.
J S, Hubbard, E R, Stadtman
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The relationships of five feedback inhibitors for the Bacillus licheniformis glutamine synthetase were investigated. The inhibitors were distinguishable by differences in their competitive relationship for the substrates of the enzyme.
J S, Hubbard, E R, Stadtman
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The Journal of Biochemistry, 1989
The nucleotide ligation site of adenylylated glutamine synthetase, which contains a unique tyrosyl residue linked through a phosphodiester bond to 5'-AMP, was studied by digestion with three hydrolytic enzymes. The products on micrococcal nuclease digestion were adenosine and o-phosphotyrosyl glutamine synthetase.
K, Kimura, Y, Nakano, K, Matsuoka
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The nucleotide ligation site of adenylylated glutamine synthetase, which contains a unique tyrosyl residue linked through a phosphodiester bond to 5'-AMP, was studied by digestion with three hydrolytic enzymes. The products on micrococcal nuclease digestion were adenosine and o-phosphotyrosyl glutamine synthetase.
K, Kimura, Y, Nakano, K, Matsuoka
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Glutamine synthetase and hepatocarcinogenesis
Carcinogenesis, 1995R, Gebhardt, G M, Williams
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