TAILIEUCHUNG - Báo cáo khoa học: Photosynthetic acclimation: Structural reorganisation of light harvesting antenna – role of redox-dependent phosphorylation of major and minor chlorophyll a/b binding proteins

In order to carry out photosynthesis, plants and algae rely on the co-opera-tive interaction of two photosystems: photosystem I and photosystem II. For maximum efficiency, each photosystem should absorb the same amount of light. | ễFEBS Journal MINIREVIEW Photosynthetic acclimation Structural reorganisation of light harvesting antenna - role of redox-dependent phosphorylation of major and minor chlorophyll a b binding proteins Joanna Kargul and James Barber Wolfson Laboratories Division of Molecular Biosciences Faculty of NaturalSciences Imperial college London UK Keywords CP29 kinases LHCII phosphorylation photosynthesis photosystem I photosystem II single particle analysis state transitions X-ray structure Correspondence J. Kargul Wolfson Laboratories Division of Molecular Biosciences Faculty of Natural Sciences ImperialCollege London London SW7 2AZ UK Fax 44 0 20 7594 5267 Tel 44 0 20 7594 1774 E-mail Received 21 September 2007 revised 11 December 2007 accepted 17 December 2007 doi In order to carry out photosynthesis plants and algae rely on the co-operative interaction of two photosystems photosystem I and photosystem II. For maximum efficiency each photosystem should absorb the same amount of light. To achieve this plants and green algae have a mobile pool of chlorophyll a b-binding proteins that can switch between being lightharvesting antenna for photosystem I or photosystem II in order to maintain an optimal excitation balance. This switch termed state transitions involves the reversible phosphorylation of the mobile chlorophyll a b-bind-ing proteins which is regulated by the redox state of the plastoquinone-mediating electron transfer between photosystem I and photosystem II. In this review we will present the data supporting the function of redoxdependent phosphorylation of the major and minor chlorophyll a b-bind-ing proteins by the specific thylakoid-bound kinases Stt7 STN7 TAKs providing a molecular switch for the structural remodelling of the lightharvesting complexes during state transitions. We will also overview the latest X-ray crystallographic and electron microscopy-derived models for structural re-arrangement of .

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