The evolutionary pathway from anoxygenic to oxygenic photosynthesis examined by comparison of the properties of photosystem II and bacterial reaction centers.
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.
Allen
J P
JP
Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA. jallen@asu.edu
Williams
J C
JC
D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism; D005075:Biological Evolution; D002734:Chlorophyll / Q000378:metabolism; D000458:Cyanobacteria / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D004579:Electron Transport; D004583:Electrons; D008345:Manganese / Q000737:chemistry / Q000378:metabolism; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism*; D010788:Photosynthesis / Q000235:genetics; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D010944:Plants / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D020560:Proteobacteria / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011522:Protons; D012242:Rhodobacter sphaeroides / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D014867:Water / Q000737:chemistry
D001426:Bacterial Proteins; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex; D011522:Protons; D014867:Water; D002734:Chlorophyll; D008345:Manganese; D010100:Oxygen
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