Abstract
Changes in topography and function of pea (Pisum sativum L.) thylakoid membrane fractions following membrane protein phosphorylation have been studied. After protein phosphorylation the stromal membrane fraction had a higher chlorophyll a/b ratio, an increased content of light-harvesting chlorophyll protein and a higher ratio of chlorophyll to cytochrome f. This indicates that a pool of light-harvesting chlorophyll protein migrates from the photosystem II-enriched grana regions to the photosystem I-enriched stroma lamellae, in agreement with Kyle et al. (1984, Biochim. Biophys. Acta 765, 89–96) and Larsson et al. (1983, Eur. J. Biochem. 136, 25–29). Phosphorylation caused a stimulation in the rate of light-limited photosystem-I electron transfer in the unappressed membrane fraction, indicating that the translocated LHC-II becomes functionally associated with photosystem I.
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Abbreviations
- Fm:
-
fluorescence yield when all traps are closed
- Fo:
-
fluorescence yield when all traps are open
- Fv:
-
Fm-Fo
- LHC-II:
-
light-harvesting chlorophyll protein associated with photosystem II
- PSI, II:
-
photosystem I, II
- P700:
-
primary donor of PSI
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Black, M.T., Lee, P. & Horton, P. Changes in topography and function of thylakoid membranes following membrane protein phosphorylation. Planta 168, 330–336 (1986). https://doi.org/10.1007/BF00392357
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DOI: https://doi.org/10.1007/BF00392357