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Bicarbonate is a key regulator but not a substrate for O 2 evolution in Photosystem II.
- Source :
-
Photosynthesis research [Photosynth Res] 2024 Oct; Vol. 162 (1), pp. 93-99. Date of Electronic Publication: 2024 Jul 22. - Publication Year :
- 2024
-
Abstract
- Photosystem II (PSII) uses light energy to oxidize water and to reduce plastoquinone in the photosynthetic electron transport chain. O <subscript>2</subscript> is produced as a byproduct. While most members of the PSII research community agree that O <subscript>2</subscript> originates from water molecules, alternative hypotheses involving bicarbonate persist in the literature. In this perspective, we provide an overview of the important roles of bicarbonate in regulating PSII activity and assembly. Further, we emphasize that biochemistry, spectroscopy, and structural biology experiments have all failed to detect bicarbonate near the active site of O <subscript>2</subscript> evolution. While thermodynamic arguments for oxygen-centered bicarbonate oxidation are valid, the claim that bicarbonate is a substrate for photosynthetic O <subscript>2</subscript> evolution is challenged.<br /> (© 2024. The Author(s).)
Details
- Language :
- English
- ISSN :
- 1573-5079
- Volume :
- 162
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Photosynthesis research
- Publication Type :
- Academic Journal
- Accession number :
- 39037690
- Full Text :
- https://doi.org/10.1007/s11120-024-01111-8