Dokument: Investigation of the Light-Induced Intermediate States in Type I Photosynthetic Reaction Centers
| Titel: | Investigation of the Light-Induced Intermediate States in Type I Photosynthetic Reaction Centers | |||||||
| URL für Lesezeichen: | https://docserv.uni-duesseldorf.de/servlets/DocumentServlet?id=14929 | |||||||
| URN (NBN): | urn:nbn:de:hbz:061-20100422-094205-0 | |||||||
| Kollektion: | Dissertationen | |||||||
| Sprache: | Englisch | |||||||
| Dokumententyp: | Wissenschaftliche Abschlussarbeiten » Dissertation | |||||||
| Medientyp: | Text | |||||||
| Autor: | Khuzeeva, Leysan [Autor] | |||||||
| Dateien: |
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| Beitragende: | Prof. Dr. Lubitz, Wolfgang [Gutachter] Prof. Dr. Schmitt, Lutz [Gutachter] | |||||||
| Stichwörter: | Photosynthesis, EPR, ENDOR, DFT, Photosystem I, Heliobacteria, electron acceptor | |||||||
| Dewey Dezimal-Klassifikation: | 500 Naturwissenschaften und Mathematik » 540 Chemie | |||||||
| Beschreibung: | Photosynthesis is the natural process by which light energy is converted into physiologically available chemical energy and is, thus, one of the most important processes in nature. Light-induced charge separation between donor and acceptor molecules (cofactors) initiates electron transfer in reaction center (RC). Subsequent electron transfer (ET) steps proceed through a sequence of cofactors. Electron paramagnetic resonance (EPR) spectroscopy allows the detection of intermediate states involved in ET (e.g. radicals, radical pairs and triplet states). The focus of this work is EPR investigation of intermediate electron acceptors in Type I RC to obtain information about their structure and function.
Chapter 5 is devoted to the primary electron acceptor A0 in the Photosystem I (PS I). The acceptor A0 is a chlorophyll a (Chl a) molecule, as was shown by X-ray crystal structure of PS I and optical data. The direct EPR investigation of transient A0 in the P700•+A0•- radical pair (RP) is difficult because of its short lifetime (~ 10 ns). Therefore, the intermediate A0 was studied in the stationary photoaccumulated state. Additionally, the electrochemically generated Chl a anion radical in liquid and frozen solution was used as model for the A0•- system. Advanced EPR methods, such as ENDOR, TRIPLE, HYSCORE, were used to obtain the hyperfine and quadrupole couplings of the photoaccumulated radical A0•- and the electrochemically generated Chl a anion radical. The comparison of the native cofactor and the in vitro model system further clarified the current picture of the electronic structure of the primary electron acceptor A0•- and the influence of the protein surrounding on the electron spin density distribution. The Chapter 6 describes multifrequency EPR study of the primary photosynthetic processes in the heliobacterial RC (HbRC). An investigation of HbRC is complicated due to fast primary ET rates and the high sensitivity of the major pigment of HbRC, BChl g, to oxidation. The main aim was to clarify the proposed role of a quinone as the secondary electron acceptor A1 of HbRC, as is seen for PS I. Several biochemical treatments on HbRC were performed, e.g. quinone replacement and photoaccumulation of ET cofactors. Transient EPR (TREPR) spectroscopy was used to detect the short-lived paramagnetic states, i.e. RPs, triplets. The influence of both oxidation and light excitation were investigated. The explanation of the experimental results as well as parameters obtained from data analysis do not require the formation of the intermediate RP P798•+A1•-. However, the participation of the quinone in the ET of HbRC can not be explicitly excluded. | |||||||
| Quelle: | Abragam A. (1961) The Principles of Nuclear Magnetism. Publisher: Oxford University Press, Oxford.
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| Lizenz: |  Urheberrechtsschutz | |||||||
| Bezüge: | 2005-2007 - Physics Department, Institute of Experimental Physics, Free University Berlin2007-2010 - Research Fellow in Max-Planck Institute for Bioinorganic Chemistry, Mülheim an der Ruhr | |||||||
| Fachbereich / Einrichtung: | Mathematisch- Naturwissenschaftliche Fakultät | |||||||
| Dokument erstellt am: | 22.04.2010 | |||||||
| Dateien geändert am: | 21.04.2010 | |||||||
| Promotionsantrag am: | 01.10.2007 | |||||||
| Datum der Promotion: | 19.04.2010 |
