Allophycocyanin A is a carbon dioxide receptor in the cyanobacterial phycobilisome.

Autor: Guillén-García A; Department of Biosciences, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Gibson SER; Department of Biosciences, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Jordan CJC; Department of Chemistry, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Ramaswamy VK; Department of Physics, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Linthwaite VL; Department of Biosciences, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Bromley EHC; Department of Physics, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Brown AP; Department of Biosciences, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Hodgson DRW; Department of Physics, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK.; Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Blower TR; Department of Biosciences, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK.; Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Verlet JRR; Department of Chemistry, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Degiacomi MT; Department of Physics, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK.; Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Pålsson LO; Department of Chemistry, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK.; Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK., Cann MJ; Department of Biosciences, Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK. m.j.cann@durham.ac.uk.; Biophysical Sciences Institute, Durham University, South Road, Durham, DH1 3LE, UK. m.j.cann@durham.ac.uk.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2022 Sep 08; Vol. 13 (1), pp. 5289. Date of Electronic Publication: 2022 Sep 08.
DOI: 10.1038/s41467-022-32925-6
Abstrakt: Light harvesting is fundamental for production of ATP and reducing equivalents for CO 2 fixation during photosynthesis. However, electronic energy transfer (EET) through a photosystem can harm the photosynthetic apparatus when not balanced with CO 2 . Here, we show that CO 2 binding to the light-harvesting complex modulates EET in photosynthetic cyanobacteria. More specifically, CO 2 binding to the allophycocyanin alpha subunit of the light-harvesting complex regulates EET and its fluorescence quantum yield in the cyanobacterium Synechocystis sp. PCC 6803. CO 2 binding decreases the inter-chromophore distance in the allophycocyanin trimer. The result is enhanced EET in vitro and in live cells. Our work identifies a direct target for CO 2 in the cyanobacterial light-harvesting apparatus and provides insights into photosynthesis regulation.
(© 2022. The Author(s).)
Databáze: MEDLINE
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