The PsbS protein controls the macro-organisation of photosystem II complexes in the grana membranes of higher plant chloroplasts |
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| Authors: | Sami Kereï che,Anett Z. Kiss,Roman Kou?il,Peter Horton |
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| Affiliation: | a Biophysical Chemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
b Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK |
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| Abstract: | The PsbS protein is a critical component in the regulation of non-photochemical quenching (NPQ) in higher plant photosynthesis. Electron microscopy and image analysis of grana membrane fragments from wild type and mutant Arabidopsis plants showed that the semi-crystalline domains of photosystem II supercomplexes were identical in the presence and absence of PsbS. However, the frequency of the domains containing crystalline arrays was increased in the absence of PsbS. Conversely, there was a complete absence of such arrays in the membranes of plants containing elevated amounts of this protein. It is proposed that PsbS controls the macro-organisation of the grana membrane, providing an explanation of its role in NPQ. |
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| Keywords: | LHCII, the main light harvesting complex of photosystem II PSII, photosystem II NPQ, non-photochemical quenching qE, the rapidly relaxing component of NPQ dependent upon the thylakoid pH gradient ΔpH |
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