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- W1999036229 abstract "Enzymes involved in redox control are important during seed germination and seedling growth. Ascorbate–glutathione cycle enzymes in barley embryo extracts were monitored both by 2D-gel electrophoresis and activity measurements from 4 to 144 h post imbibition (PI). Strikingly different activity profiles were observed. No ascorbate peroxidase (APX) activity was present in mature seeds but activity was detected after 24 h PI and increased 14-fold up to 144 h PI. In contrast, dehydroascorbate reductase (DHAR) activity was present at 4 h PI and first decreased by 9-fold until 72 h PI followed by a 5-fold increase at 144 h PI. Glutathione reductase and monodehydroascorbate reductase activities were also detected at 4 h PI, and showed modest increases of 1.8- and 2.7-fold, respectively, by 144 h PI. The combination of functional analysis with the proteomics approach enabled correlation of the activity profiles and protein abundance. While gel spots containing APX showed intensity changes consistent with the activity profile from 0 to 72 h PI, DHAR spot intensities indicated that post-translational regulation may be responsible for the observed changes in activity. Transcript profiling, 2D-western blotting and mass spectrometric characterization of multiple APX spots demonstrated the presence of APX1 and minor amounts of APX2." @default.
- W1999036229 created "2016-06-24" @default.
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- W1999036229 date "2010-10-01" @default.
- W1999036229 modified "2023-09-23" @default.
- W1999036229 title "Proteomic and activity profiles of ascorbate–glutathione cycle enzymes in germinating barley embryo" @default.
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- W1999036229 doi "https://doi.org/10.1016/j.phytochem.2010.06.024" @default.
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