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Science. 2018 Jun 15;360(6394):1210-1213. doi: 10.1126/science.aar8313.

Photochemistry beyond the red limit in chlorophyll f-containing photosystems.

Author information

1
Department of Life Sciences, Imperial College, London SW7 2AZ, UK. a.rutherford@imperial.ac.uk d.nurnberg@imperial.ac.uk a.fantuzzi@imperial.ac.uk.
2
Research School of Chemistry, ANU, Canberra, Australia.
3
Istituto di Biofisica, Consiglio Nazionale delle Ricerche, via Celoria 26, 20133 Milano, Italy.
4
Department of Life Sciences, Imperial College, London SW7 2AZ, UK.
5
Institut de Biologie Physico-Chimique, Unité Mixte de Recherche 7141 Centre National de la Recherche Scientifique-Université Pierre et Marie Curie, 13 Rue Pierre et Marie Curie, 75005 Paris, France.
6
School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK.
7
Institut de Biologie Intégrative de la Cellule, UMR 9198, Bât 532, CEA Saclay, 91191 Gif-sur-Yvette, France.

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.

Comment in

PMID:
29903971
DOI:
10.1126/science.aar8313
[Indexed for MEDLINE]
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