Reduced Glutathione as an Effector of Phosphoenolpyruvate Carboxylase of the Crassulacean Acid Metabolism Plant Sedum praealtum D.C; PY1983;_WJD_2020-0926_IR93_

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2020-09-26
Reduced Glutathione as an Effector of Phosphoenolpyruvate Carboxylase of the Crassulacean Acid Metabolism Plant Sedum praealtum D.C; PY1983; Please select a University Name.;_WJD_2020-0926_V001R01_IR93_RvD20200926_

Source (資訊來源):
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1066010/
Info cited on 2020-09-26-WD6 (資訊引用於 中華民國109年9月26日) by 湯偉晉 (WeiJin Tang)
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Plant Physiol. 1983 Jan; 71(1): 187–189.
doi: 10.1104/pp.71.1.187
PMCID: PMC1066010
PMID: 16662783

Reduced Glutathione as an Effector of Phosphoenolpyruvate Carboxylase of the Crassulacean Acid Metabolism Plant Sedum praealtum D.C

Yiannis Manetas and Nikos A. Gavalas
Laboratory of Plant Physiology, University of Patras, Patras, Greece

Abstract
Reduced glutathione, but not mercaptoethanol or dithiothreitol, inhibits phosphoenolpyruvate carboxylase (PEPC) in desalted leaf extracts from Sedum praealtum D.C. The inhibition is more evident at low pH values (< 7.2) and becomes increasingly smaller at higher pH. In the presence of the inhibitor, the hyperbolic rate curve of night PEPC is transformed to sigmoid and the S0.5 is increased. When the enzyme is extracted during the day, the rate curve is sigmoid and it is not changed by the inhibitor, though the S0.5 is further increased. Oxidized glutathione is completely inactive. Levels of reduced glutathione in leaf tissue are distinctly higher in the light. A role of photosynthetically reduced glutathione in the regulation of PEPC in Crassulacean acid metabolism species appears probable.

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