title: Functional architecture of higher plant photosystem II supercomplexes.
abstract: Photosystem II (PSII) is a large multiprotein complex, which catalyses water splitting and plastoquinone reduction necessary to transform sunlight into chemical energy. Detailed functional and structural studies of the complex from higher plants have been hampered by the impossibility to purify it to homogeneity. In this work, homogeneous preparations ranging from a newly identified particle composed by a monomeric core and antenna proteins to the largest C(2)S(2)M(2) supercomplex were isolated. Characterization by biochemical methods and single particle electron microscopy allowed to relate for the first time the supramolecular organization to the protein content. A projection map of C(2)S(2)M(2) at 12 A resolution was obtained, which allowed determining the location and the orientation of the antenna proteins. Comparison of the supercomplexes obtained from WT and Lhcb-deficient plants reveals the importance of the individual subunits for the supramolecular organization. The functional implications of these findings are discussed and allow redefining previous suggestions on PSII energy transfer, assembly, photoinhibition, state transition and non-photochemical quenching.
authors.affiliation: Faculté des Sciences Luminy, Laboratoire de Génétique et Biophysique des Plantes, Université Aix Marseille, Marseille, France. stefano.caffarri@univmed.fr
authors.forename: Stefano
authors.initials: S
authors.lastname: Caffarri
authors.forename: Roman
authors.initials: R
authors.lastname: Kouril
authors.forename: Sami
authors.initials: S
authors.lastname: Kereïche
authors.forename: Egbert J
authors.initials: EJ
authors.lastname: Boekema
authors.forename: Roberta
authors.initials: R
authors.lastname: Croce
mesh_terms: D008854:Microscopy, Electron; D008958:Models, Molecular; D009154:Mutation; D010100:Oxygen / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000032:analysis* / Q000302:isolation & purification / Q000378:metabolism / Q000648:ultrastructure; D010940:Plant Proteins / Q000032:analysis* / Q000302:isolation & purification / Q000378:metabolism / Q000648:ultrastructure; D010944:Plants / Q000737:chemistry* / Q000235:genetics
chemical_list: D045332:Photosystem II Protein Complex; D010940:Plant Proteins; D010100:Oxygen
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