Special Issue: Förster Resonance Energy Transfer

Photosynthetic process is powered by several photosyntheticproteins that are located within a membrane. The two photosystems (PS I and PSII) convert energy of absorbed photons into a flow of electrons. Both proteinscontain significant amount of chlorophylls that absorb sunlight and transferelectronic excitation energy to respective reaction centers that are located inthe middle of each complex and that consists of few chlorophyll molecules. Theelectron generated in PS II complex is transferred to the cytochrome 6 complex via plastoquinol pool (PQH2), and then to PS Iby a small protein called plastocyanin (PC). The cytochrome 6 complex couples electron transport to proton translocation acrossthe membrane that serves to build a proton gradient across the membrane. PS IIcaptures its missing electron from water molecule generating free oxygen andprotons, which further rises the proton gradient across the photosyntheticmembrane. The electrochemical gradient generated in this way drives theseprotons through an ATP synthase making this molecular size motor spin. Themechanical energy of that motion is used to force ADP and Pimolecules together creating ATP (adenosine triphosphate) that serves as auniversal energy carrier in living organisms. The electron generated by PS I ispicked up by a small mobile protein – ferredoxin, FD – and is transported toFNR where its energy is used to reduce NADP+ into NADPH.

Resonance energy transfer in proteins; ..

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Resonance energy transfer - Biology-Online Dictionary

"Our results suggest that correlated protein environments preserve electronic coherence in photosynthetic complexes and allow the excitation to move coherently in space, enabling highly efficient energy harvesting and trapping in photosynthesis," says Fleming. "Rather than simply serving as a static structure that holds the pigments in the proper geometry for efficient energy transfer to the reaction centers, as was anticipated, we find that the protein environment in the reaction centers plays a dynamic role in optimizing the efficiency of the energy transfer."

Resonant energy transfer - Wikipedia

In the latest results, Fleming and his group have found that in the tightly packed complex formed by pigments and proteins, the light-induced energy excitations in the pigment molecules also set off the vibrational modes of the proteins. This creates a resonance that enhances energy transfer efficiency and is responsible for the long lifetime of the electronic coherence.

Nature's solar energy harvesting system, photosynthesis, serves as amodel for photon absorption, spectra broadening, and energy transfer.
The method is based on Förster resonant energy transfer(),similar to the method utilized by nature to harvest light energy.

14/04/2017 · Resonant energy transfer

Chlorophylls and other pigment molecules, often in association with specialized proteins, can form complexes which act as efficient antennas that collect light energy and pass it on to the photosynthetic reaction centers or to the conducting layer of a solar cell. The energy is captured and transiently stored in the bonds between specific groups of atoms in the pigments, which are therefore referred to as chromophores. Different chromophores absorb light of different wavelengths, so a complex containing various types can harvest light over a large segment of the spectrum.

T1 - Förster energy transfer theory as reflected in the structures of photosynthetic light-harvesting systems

Förster Resonant Energy Transfer - Internetchemistry

AB - Förster's theory of resonant energy transfer underlies a fundamental process in nature, namely the harvesting of sunlight by photosynthetic life forms. The theoretical framework developed by Förster and others describes how electronic excitation migrates in the photosynthetic apparatus of plants, algae, and bacteria from light absorbing pigments to reaction centers where light energy is utilized for the eventual conversion into chemical energy. The demand for highest possible efficiency of light harvesting appears to have shaped the evolution of photosynthetic species from bacteria to plants which, despite a great variation in architecture, display common structural themes founded on the quantum physics of energy transfer as described first by Förster. Herein, Förster's theory of excitation transfer is summarized, including recent extensions, and the relevance of the theory to photosynthetic systems as evolved in purple bacteria, cyanobacteria, and plants is demonstrated. Förster's energy transfer formula, as used widely today in many fields of science, is also derived.

Yatsui, “Efficient optical near-field energy transfer along an Au nanodot coupler with size-dependent resonance,”

Coherence in Energy Transfer and Photosynthesis | …

The resonance between the vibrational frequency and energy gap between the sites leads to a large delocalization of vibronic states, which then results in faster energy transfer and longer-lived mixed coherences.