Photosystem I-LHCII megacomplexes respond to high light and aging in plants
| Autor: | Eliezer M. Schwarz, John E. Froehlich, Stephanie Tietz |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Photosynthetic reaction centre Photoinhibition Photosystem II Cytochrome b6f complex food and beverages Plant physiology macromolecular substances Cell Biology Plant Science General Medicine Biology Photochemistry Photosystem I 01 natural sciences Biochemistry 03 medical and health sciences Light intensity 030104 developmental biology Thylakoid Biophysics 010606 plant biology & botany |
| Zdroj: | Photosynthesis Research. 136:107-124 |
| ISSN: | 1573-5079 0166-8595 |
| DOI: | 10.1007/s11120-017-0447-y |
| Popis: | Photosystem II is known to be a highly dynamic multi-protein complex that participates in a variety of regulatory and repair processes. In contrast, photosystem I (PSI) has, until quite recently, been thought of as relatively static. We report the discovery of plant PSI-LHCII megacomplexes containing multiple LHCII trimers per PSI reaction center. These PSI-LHCII megacomplexes respond rapidly to changes in light intensity, as visualized by native gel electrophoresis. PSI-LHCII megacomplex formation was found to require thylakoid stacking, and to depend upon growth light intensity and leaf age. These factors were, in turn, correlated with changes in PSI/PSII ratios and, intriguingly, PSI-LHCII megacomplex dynamics appeared to depend upon PSII core phosphorylation. These findings suggest new functions for PSI and a new level of regulation involving specialized subpopulations of photosystem I which have profound implications for current models of thylakoid dynamics. |
| Databáze: | OpenAIRE |
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