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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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