Light-harvesting in photosystem I
Open Access
- 4 May 2013
- journal article
- review article
- Published by Springer Science and Business Media LLC in Photosynthesis Research
- Vol. 116 (2-3), 153-166
- https://doi.org/10.1007/s11120-013-9838-x
Abstract
This review focuses on the light-harvesting properties of photosystem I (PSI) and its LHCI outer antenna. LHCI consists of different chlorophyll a/b binding proteins called Lhca’s, surrounding the core of PSI. In total, the PSI-LHCI complex of higher plants contains 173 chlorophyll molecules, most of which are there to harvest sunlight energy and to transfer the created excitation energy to the reaction center (RC) where it is used for charge separation. The efficiency of the complex is based on the capacity to deliver this energy to the RC as fast as possible, to minimize energy losses. The performance of PSI in this respect is remarkable: on average it takes around 50 ps for the excitation to reach the RC in plants, without being quenched in the meantime. This means that the internal quantum efficiency is close to 100 % which makes PSI the most efficient energy converter in nature. In this review, we describe the light-harvesting properties of the complex in relation to protein and pigment organization/composition, and we discuss the important parameters that assure its very high quantum efficiency. Excitation energy transfer and trapping in the core and/or Lhcas, as well as in the supercomplexes PSI-LHCI and PSI-LHCI-LHCII are described in detail with the aim of giving an overview of the functional behavior of these complexes.Keywords
This publication has 116 references indexed in Scilit:
- Photosystem I of Chlamydomonas reinhardtii Contains Nine Light-harvesting Complexes (Lhca) Located on One Side of the Core*Online Journal of Public Health Informatics, 2011
- Conformational switching explains the intrinsic multifunctionality of plant light-harvesting complexesProceedings of the National Academy of Sciences of the United States of America, 2011
- The Role of the Individual Lhcas in Photosystem I Excitation Energy TrappingBiophysical Journal, 2011
- A Red-shifted Antenna Protein Associated with Photosystem II in Physcomitrella patensOnline Journal of Public Health Informatics, 2011
- Excitation-Energy Transfer Dynamics of Higher Plant Photosystem I Light-Harvesting ComplexesBiophysical Journal, 2011
- Structure Determination and Improved Model of Plant Photosystem I*Online Journal of Public Health Informatics, 2010
- Protein dynamics-induced variation of excitation energy transfer pathwaysProceedings of the National Academy of Sciences of the United States of America, 2009
- The Origin of the Low-Energy Form of Photosystem I Light-Harvesting Complex Lhca4: Mixing of the Lowest Exciton with a Charge-Transfer StateBiophysical Journal, 2009
- The Role of Lhca Complexes in the Supramolecular Organization of Higher Plant Photosystem IOnline Journal of Public Health Informatics, 2009
- Crystal structure of spinach major light-harvesting complex at 2.72 Å resolutionNature, 2004