The evolutionary pathway from anoxygenic to oxygenic photosynthesis examined by comparison of the properties of photosystem II and bacterial reaction centers |
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Authors: | J P Allen J C Williams |
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Institution: | (1) Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA |
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Abstract: | In photosynthetic organisms, such as purple bacteria, cyanobacteria, and plants, light is captured and converted into energy
to create energy-rich compounds. The primary process of energy conversion involves the transfer of electrons from an excited
donor molecule to a series of electron acceptors in pigment–protein complexes. Two of these complexes, the bacterial reaction
center and photosystem II, are evolutionarily related and structurally similar. However, only photosystem II is capable of
performing the unique reaction of water oxidation. An understanding of the evolutionary process that lead to the development
of oxygenic photosynthesis can be found by comparison of these two complexes. In this review, we summarize how insight is
being gained by examination of the differences in critical functional properties of these complexes and by experimental efforts
to alter pigment–protein interactions of the bacterial reaction center in order to enable it to perform reactions, such as
amino acid and metal oxidation, observable in photosystem II. |
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