Shirley Gunter

Fenna–Matthews–Olson complex Fenna–Matthews–Olson complex Add article description The Fenna–Matthews–Olson (FMO) complex is a water-soluble complex and was the first pigment-protein complex (PPC) to be structurally analyzed by x-ray spectroscopy.[2] 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). Figure 1. The FMO protein trimer.[1] The BChl a molecules are depicted in green, the central magnesium atom…

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