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• W2048272012 abstract "The 505 nm change in isolated chloroplasts of Lactuca sativa var. Manoa showed a linear correlation with violaxanthin decrease. The corresponding difference extinction coefficient was established as 27.3 mM−1 · cm−1. The 505 nm change followed first-order kinetics. The first-order rate constant, a measure of de-epoxidase activity, and the final extent of the 505 nm change, a measure of the extent of de-epoxidation, varied with light intensity. In 670 nm light the activity remained about half-maximal at intensities from 1 to 4 kerg · cm−2 · s−1 before reaching saturation at 9 kergs · cm−2 · s−1. In contrast, the extent showed a simpler response and reached saturation already at 4 kergs · cm−2 · s−1. These results suggest that different photosynthetic factors determine de-epoxidase activity and de-epoxidation extent. De-epoxidase activity is known to reflect steady-state thylakoid pH whereas the de-epoxidation extent was found to reflect light-dependent variable substrate availability. The available fraction varied in size from 40% of the total violaxanthin at 1 kerg · cm−2 · s−1 to 67% at saturation. The possibility that variable availability reflects conformational changes of the membrane near Photosystem II which result in variable exposure of the substrate to enzyme is discussed." @default.
• W2048272012 created "2016-06-24" @default.
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• W2048272012 date "1974-07-01" @default.
• W2048272012 modified "2023-09-27" @default.
• W2048272012 title "Light-induced de-epoxidation of violaxanthin in lettuce chloroplasts. III. Reaction kinetics and effect of light intensity on de-epoxidase activity and substrate availability" @default.
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• W2048272012 doi "https://doi.org/10.1016/0005-2728(74)90119-4" @default.
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