Photochemistry beyond the red limit in chlorophyll f-containing photosystems
Date
2018
Authors
Nürnberg, Dennis J
Morton, Jennifer
Santabarbara, Stefano
Telfer, Alison
Joliot, Pierre
Antonaru, Laura A
Ruban, Alexander V
Cardona, Tanai
Krausz, Elmars
Boussac, Alain
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American Association for the Advancement of Science
Abstract
Photosystems I and II convert solar energy into the chemical energy that powers life. Chlorophyll a photochemistry, using red light (680 to 700 nm), is near universal and is considered to define the energy "red limit" of oxygenic photosynthesis. We present biophysical studies on the photosystems from a cyanobacterium grown in far-red light (750 nm). The few long-wavelength chlorophylls present are well resolved from each other and from the majority pigment, chlorophyll a. Charge separation in photosystem I and II uses chlorophyll f at 745 nm and chlorophyll f (or d) at 727 nm, respectively. Each photosystem has a few even longer-wavelength chlorophylls f that collect light and pass excitation energy uphill to the photochemically active pigments. These photosystems function beyond the red limit using far-red pigments in only a few key positions.
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Science
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Journal article
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DOI
10.1126/science.aar8313
Restricted until
2037-12-31