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Photosystem II of higher plants is a multisubunit transmembrane complex composed of a core moiety and an extensive peripheral antenna system. The number of antenna polypeptides per core complex is modulated fol-lowing environmental conditions in order to optimize photosynthetic per-formance. | ễFEBS Journal Biochemical and structural analyses of a higher plant photosystem II supercomplex of a photosystem I-less mutant of barley Consequences of a chronic over-reduction of the plastoquinone pool Tomas Morosinotto1 2 Roberto Bassi1 2 Sara Frigerio1 2 Giovanni Finazzi3 Edward Morris4 and James Barber5 1 Université d Aix-Marseille II Faculte des Sciences de Luminy Laboratoire de Genetique et de Biophysique des Plantes LGBP CNRS-CEA-Universite de la Mediterranee Marseille France 2 Dipartimento Scientifico e Tecnologico University di Verona Italy 3 Unite Mixte de Recherche 7141 CNRS Universite Paris 6 Institut de Biologie Physico-Chimique Paris France 4 The Institute of Cancer Research London UK 5 Wolfson Laboratories Division of Molecular Biosciences South Kensington Campus ImperialCollege London UK Keywords Lhc acclimation photosystem plastoquinone supercomplexes Correspondence T. Morosinotto Universite d Aix-Marseille II Faculte des Sciences de Luminy Laboratoire de Genetique et de Biophysique des Plantes LGBP UMR 6191 CNRS-CEA-Universite de la Mediterranee TPR2 9eme etage Bloc 2 163 Avenue de Luminy 13288 Marseille Cedex 9 France Fax 33 4 91 82 95 66 Tel 33 4 91 82 95 62 E-mail morosino@luminy.univ-mrs.fr Received 13 July 2006 revised 10 August 2006 accepted 15 August 2006 doi 10.1111 j.1742-4658.2006.05465.x Photosystem II of higher plants is a multisubunit transmembrane complex composed of a core moiety and an extensive peripheral antenna system. The number of antenna polypeptides per core complex is modulated following environmental conditions in order to optimize photosynthetic performance. In this study we used a barley Hordeum vulgare mutant viridis zb63 which lacks photosystem I to mimic extreme and chronic overexcitation of photosystem II. The mutation was shown to reduce the photosystem II antenna to a minimal size of about 100 chlorophylls per photosystem II reaction centre which was not further reducible. The minimal photosystem II unit was .
