Fmo cpmplex
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The Fenna-Matthews-Olson (FMO) complex is a trimeric pigment-protein complex found in green sulfur bacteria. It mediates the transfer of excitation energy from light-harvesting antenna complexes to the bacterial reaction center. Each monomer contains eight bacteriochlorophyll a molecules bound to the protein scaffold, mostly via histidine amino acids. The FMO complex serves as a molecular wire, transporting excitons generated during light harvesting to the reaction center for photochemical reactions. Excitation energy transfer via the FMO complex is fast and highly efficient, occurring with quantum coherence such that little energy is lost as heat or radiation.
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- 1. BY SHARIQA AISHA DEPARTMENT OF BIORESOURCES UNIVERSITY OF KASHMIR
- 2. The Fenna-Matthews-Olson (FMO) complex is a water-soluble complex and was the first pigment- protein complex (PPC) to be structure analyzed by x- ray spectroscopy. It appears in green sulfur bacteria and mediates the excitation energy transfer from light-harvesting chlorosomes to the membrane-embedded bacterial reaction center (bRC). Its structure is trimeric (C3-symmetry). Each of the three monomers contains eight bacteriochlorophyll a (BChl a) molecules. They are bound to the protein scaffold via chelation of their central magnesium atom either to amino acids of the protein (mostly histidine) or water-bridged oxygen atoms (only one BChl a of each monomer). The FMO protein trimer
- 3. FennaMatthewsOlson (FMO) complex, a trimeric pigmentprotein complex which lies between the antennae complexes and the reaction center of the photosystem II of sulfur green bacteria, and whose primary function is to serve as a molecular wire transporting the excitons generated during light harvesting by the pigments toward the reaction center where the cascade of redox chemical reactions take place. The excitation energy transfer dynamics are required to be fast or otherwise it is lost. It is now known that this transport occurs with quantum coherence; that is, very little energy is dissipated as heat or radiation, making it an almost 100% efficient process.