Changing concepts about the distribution of Photosystems I and II between grana-appressed and stroma-exposed thylakoid membranes |
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Authors: | Anderson Jan M |
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Institution: | (1) Photobioenergetics, Research School of Biological Sciences, The Australian National University, G.P.O. Box 475, Canberra, ACT, 2601, Australia |
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Abstract: | Thylakoid membranes of higher plants and some green algae, which house the light-harvesting and energy transducing functions
of the chloroplast, are structurally unique. The concept of the photosynthetic unit of the 1930s (Robert Emerson, William
Arnold and Hans Gaffron), needing one reaction center per hundreds of antenna molecules, was modified by the discovery of
the Enhancement effect in oxygen evolution in two different wavelengths of light (Robert Emerson and his coworkers) in the
late 1950s, followed by the 1960 Z scheme of Robin Hill and Fay Bendall. It was realized that two light reactions and two
pigment systems were needed for oxygenic photosynthesis. Changing ideas about the distribution of Photosystem II (PS II) and
PS I between the green-appressed and stroma-exposed thylakoid membrane domains, which led to the concept of lateral heterogeneity,
are discussed.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Jan Anderson Bertil Andersson Keith Boardman Robin Hill lateral heterogeneity molecular organization Photosystem I Photosystem II Philip Thornber thylakoid stacking |
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