Results 181 to 190 of about 7,898 (228)
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Plant dehydroascorbate reductase moonlights as membrane integrated ion channel
Archives of Biochemistry and Biophysics, 2023Plant dehydroascorbate reductases (DHARs) are only known as soluble antioxidant enzymes of the ascorbate-glutathione pathway. They recycle ascorbate from dehydroascorbate, thereby protecting plants from oxidative stress and the resulting cellular damage.
Bhaba Krishna Das +9 more
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A reappraisal of leukocyte dehydroascorbate reductase
Biochimica et Biophysica Acta (BBA) - General Subjects, 1985Dehydroascorbate reductase (glutathione:dehydroascorbate oxidoreductase, EC 1.8.5.1) activity was determined in human leukocyte homogenates using a direct spectrophotometric assay. Despite previous studies, using a less sensitive coupled assay, which reported that this enzyme was present in leukocytes, we found that neither neutrophil nor chronic ...
R L, Stahl, L F, Liebes, R, Silber
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A spectrophotometric assay for dehydroascorbate reductase
Analytical Biochemistry, 1983A simple spectrophotometric assay for dehydroascorbate reductase based on the change in absorbance associated with the formation of ascorbic acid is described. Using a partially purified preparation from spinach leaves, the reaction was found to be linear with time and enzyme concentration.
R L, Stahl +3 more
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Dehydroascorbate reductase from potato tubers
Phytochemistry, 1991Abstract Dehydroascorbate reductase from the cytosol of potato tubers was purified to a nearly homogeneous state. The enzyme had a M r of ca 23 000, a pH optimum of ica 8, a K m for dehydroascorbate of 0.39 mM and a K m for GSH of 4.35 mM. GSH could not be replaced by other electron donors such as cysteine or dithiothreitol.
DIPIERRO, Silvio, BORRACCINO G.
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Human cell dehydroascorbate reductase. Kinetic and functional properties
Biochimica et Biophysica Acta (BBA) - Enzymology, 1981Dehydroascorbate reductase (glutathione: dehydroascorbate oxidoreductase, EC 1.8.5.1) activity was examined in crude cytosol extracts of human cells. In blood neutrophil and lymphocyte extracts, the Km at pH 6.85 for dehydroascorbate was 1.3 mM, and for reduced glutathione 3.8 mM. Rates of dehydroascorbate uptake by intact human neutrophils, monocytes,
R, Bigley +3 more
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Dehydroascorbate reductase and salt stress.
CABI Reviews, 2009Abstract Salinity is the major environmental limiting factor of plant growth and productivity. Salt, as well as drought, chilling and extreme temperatures, increases the levels of reactive oxygen species (ROS). Excessive levels of ROS lead to oxidative damage to cellular molecules, ageing and cell death.
K. Amako, T. Ushimaru
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Ebselen Has Dehydroascorbate Reductase and Thioltransferase-like Activities
Biochemical and Biophysical Research Communications, 2002Ebselen (2-phenyl-1,2-benzisoselenazol-3(2H)-one), a seleno-organic compound, has been reported to mimic glutathione peroxidase (GPX). Since bovine erythrocyte GPX showed dehydroascorbic acid (DHA) reductase and thioltransferase (TTase) activities, ebselen was also examined for DHA reductase and TTase-like activities.
Che-Hun, Jung +2 more
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Antioxidant role of dehydroascorbic acid reductase in insects
Biochimica et Biophysica Acta (BBA) - General Subjects, 1993Dehydroascorbic acid reductase, which catalyses the regeneration of ascorbic acid from dehydroascorbic acid, is reported here to occur widely among insects. Due to the reported absence of glutathione peroxidase in insects and the generally low affinity of catalase for hydrogen peroxide, dehydroascorbic acid reductase may play a pivotal role in the ...
C B, Summers, G W, Felton
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A ‘dehydroascorbic acid reductase’ factor in guinea-pig tissues
Experientia, 1967Dans des tissus de cobayes il existe une proteine capable de catalyser la reduction de l'acide dehydrascorbique en acide ascorbique. Sa distribution, sa purification, sa specificite et son action en presence d'enzymes inhibitrices typiques ont ete etudie.
R F, Grimble, R E, Hughes
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λ-crystallin related to dehydroascorbate reductase in the rabbit lens
Japanese Journal of Ophthalmology, 2003To evaluate the relationship of lambda-crystallin to reduced nicotinamide adenine dinucleotide (NADH)-dependent dehydroascorbate (DHA) reductase found specifically in the rabbit lens.DHA reductase Fractions I-IV were separated from the lambda/betaL1-crystallin fraction of rabbit lens soluble protein by diethylaminoethyl (DEAE)-cellulose ion-exchange ...
Takahiro, Suzuki +8 more
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