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The PsbS protein controls the macro‐organisation of photosystem II complexes in the grana membranes of higher plant chloroplasts
Author(s) -
Kereïche Sami,
Kiss Anett Z.,
Kouřil Roman,
Boekema Egbert J.,
Horton Peter
Publication year - 2010
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2009.12.031
Subject(s) - photosystem ii , chloroplast , photosynthesis , membrane , thylakoid , non photochemical quenching , quenching (fluorescence) , biophysics , arabidopsis , electron transport chain , mutant , chemistry , biology , arabidopsis thaliana , botany , crystallography , biochemistry , fluorescence , gene , physics , quantum mechanics
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.