PhD ceremony: Ms. I.E. Wientjes, 16.15 uur, Senaatskamer Academiegebouw, Broerstraat 5, Groningen
Dissertation: Revealing the light-harvesting properties of Photosytem I. From single antenna to supercomplex
Promotor(s): prof. R. Groce
Faculty: Mathematics and Natural Sciences
Photosynthesis is the process in which light energy is used to convert carbon dioxide into carbohydrates. Oxygenic photosynthesis is driven by two photosystems, Photosystem I and Photosystem II. This thesis describes a detailed analysis of the light-harvesting properties of higher plant Photosystem I. Photosystem I is a pigment-protein supercomplex, composed of a core complex and four light-harvesting proteins, Lhca1-4. We study the system at various levels of complexity, from individual antennas to supercomplexes. In the most detailed level, the level of the monomers, we investigated how the spectroscopic properties of the red forms of Lhca4 are modulated by the protein environment. At the next level we studied the light-harvesting properties of the Lhca1/4 and the Lhca2/3 dimer. Using assemble experiments we revealed the absorption and emission properties as well as the inter-monomer transfer rates. We also studied the emission properties of the Lhca complexes at the single-molecule level. The results showed that the Lhca complexes can reversible switch off their entire red-emission band by a conformational change, meaning that it is essential to consider the flexibility of the Lhc proteins in order to understand their spectroscopic properties. At the following level we have studied PSI complexes with reduced antenna size or altered antenna composition. Finally, we have presented a comprehensive picture of the excitation energy transfer routes and rates in the entire photosystem I supercomplex.
Three researchers of the Faculty of Science and Engineering have been awarded an ENW-XS grant by the Dutch Research Council (Nederlandse Organisatie voor Wetenschappelijke Onderzoek, NWO): Prof. A.I. Guskov the Groningen Biomolecular Sciences and...
Bayu Jayawardhana has been appointed scientific director of DISC, the interuniversity research institute and graduate school that unites all university groups in the Netherlands that are active in systems and control theory and engineering. The...
Researchers Clemens Mayer and Danny Incarnato of the University of Groningen have been awarded an ERC Consolidator Grant.
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