Results 171 to 180 of about 46,501 (205)

Preparation of guanosine tetraphosphate (ppGpp) and guanosine pentaphosphate (pppGpp) from Escherichia coli ribosomes

Analytical Biochemistry, 1974
Abstract A means of preparative enzymatic synthesis of guanosine tetraphosphate (ppGpp), guanosine pentaphosphate (pppGpp), and related derivatives is deseribed. The Escherichia coli ribosomes can be recovered, stored, and used repeatedly as a source of synthetic activity.
Michael Cashel
exaly   +4 more sources

Synergistic inhibition of ATP phosphoribosyltransferase by guanosine tetraphosphate and histidine

Biochemical and Biophysical Research Communications, 1977
Abstract In the presence of partially inhibiting concentrations of the feedback inhibitor histidine guanosine-5′-diphosphate-3′-diphosphate becomes a potent inhibitor of the residual activity of ATP phosphoribosyltransferase from Salmonella typhimurium . Inhibition by guanosine tetraphosphate is higher order and slowly reversible.
Stanley M Parsons
exaly   +4 more sources

Synthesis of guanosine tetraphosphate (Magic Spot I) in Saccharomyces cerevisiae

Biochemical and Biophysical Research Communications, 1977
Abstract Guanosine tetraphosphate (Magic Spot I) has been found in formic acid extracts of Saccharomyces cerevisiae subjected to heat shock. The yeast compound comigrates with authentic ppGpp in several chromatographic systems, and further tests confirm its identity with the guanosine-5′-diphosphate-3′-diphosphate found in bacteria ...
C C Pao, Jonathan A Gallant
exaly   +4 more sources

Quantification of guanosine triphosphate and tetraphosphate in plants and algae using stable isotope-labelled internal standards

Talanta, 2020
Guanosine tetraphosphate (G4P) and guanosine pentaphosphate (G5P) are signalling nucleotides found in bacteria and photosynthetic eukaryotes that are implicated in a wide-range of processes including stress acclimation, developmental transitions and ...
Sylvie Citerne, Gregory Mouillé, Emmanuelle Bouveret   +2 more
exaly   +3 more sources

Metabolism of Guanosine Tetraphosphate in Escherichia coli

European Journal of Biochemistry, 1972
In rel+ strains of Escherichia coli guanosine 2′(3′)‐diphosphate‐5′‐diphosphate (ppGpp) was found to accumulate (a) during amino acid starvation of an auxotrophic strain, (b) during heating to the non‐permissive temperature of a valSts strain, (c) during heating of a wild‐type strain to temperatures above 46°C and (d) during treatment with trimethoprim
E, Lund, N O, Kjeldgaard
openaire   +3 more sources

Relationship between guanosine tetraphosphate and accuracy of translation in Salmonella typhimurium

Biochemistry, 1989
In bacteria a high level of mistranslation is observed in amino acid starved rel-, but not rel+, strains, and mistranslation can be studied qualitatively by means of "stuttering" experiments in two-dimensional protein gels. It has been suggested that the low level of mistranslation that occurs in rel+ strains is assured by guanosine 5'-diphosphate 3 ...
Negre, D., Cortay, Jc, Donini, P., Cozzone, Aj   +3 more
openaire   +4 more sources

Guanosine tetraphosphate: coordinator of metabolic response to nitrogen starvation in enterobacteria

Trends in Biochemical Sciences, 1979
Abstract Deprivation of amino acids brings about major adjustments in bacterial metabolism that are designed to counteract the emergency. These are mediated by pleiotropic regulatory effects of guanosine tetraphosphate (ppGpp), and are felt at the levels of ribosome and membrane biosynthesis, intermediary metabolism and protein turnover. Regulation by
William A. Bridger, William Paranchych
openaire   +2 more sources

Guanosine Tetraphosphate, Guanosine Penta Phosphate (ppGpp, pppGpp)

, 2008
openaire   +2 more sources

Changes in guanosine tetraphosphate (ppGpp) level during nitrogenase expression in the phototrophic bacterium Rhodopseudomonas palustris

FEBS Letters, 1983
Guanosine tetraphosphate (ppGpp) levels were followed in the non-sulfur purple bacterium Rhodopseudomonas palustris during derepression and repression of nitrogenase, and during nitrogen starvation which leads to overproduction of this enzyme. Conditions
Walter G Zumft
exaly   +2 more sources

Identification of factors regulating guanosine tetraphosphate (ppGpp) biosynthesis in Arabidopsis thaliana

2016
L'identification des facteurs qui modulent la biosynthèse de ppGpp chez Arabidopsis thaliana La ppGpp et la pppGpp, qui sont synthétisées/hydrolysées par les RelA/Spot homologs (RSH), jouent un rôle centrale dans l’adaptation des bactéries contre la privation des nutriments et les stress environnementaux.
Hang Ke
openaire   +2 more sources