Impact of ion fluxes across thylakoid membranes on photosynthetic electron transport and photoprotection
Abstract
In photosynthetic thylakoid membranes the proton motive force (pmf) not only drives ATP synthesis, in addition it is central to controlling and regulating energy conversion. As a consequence, dynamic fine-tuning of the two pmf components, electrical (Δψ) and chemical (ΔpH), is an essential element for adjusting photosynthetic light reactions to changing environmental conditions. Good evidence exists that the Δψ/ΔpH partitioning is controlled by thylakoid potassium and chloride ion transporters and channels. However, a detailed mechanistic understanding of how these thylakoid ion transporter/channels control pmf partitioning is lacking. In this work, we combined functional measurements on potassium and chloride ion transporter and channel loss-of-function mutants with extended mathematical simulations of photosynthetic light reactions in thylakoid membranes to obtain detailed kinetic insights into the complex interrelationship between membrane energization and ion fluxes across thylakoid membranes. The data reveal that potassium and chloride fluxes in the thylakoid lumen determined by the K+/H+ antiporter KEA3 and the voltage-gated Cl– channel VCCN1/Best1 have distinct kinetic responses that lead to characteristic and light-intensity-dependent Δψ/ΔpH oscillations. These oscillations fine-tune photoprotective mechanisms and electron transport which are particularly important during the first minutes of illumination and under fluctuating light conditions. By employing the predictive power of the model,more »
- Authors:
-
[1];
[3];
[3];
[2];
[2]
- Washington State Univ., Pullman, WA (United States); Univ. of Washington, Seattle, WA (United States)
- Washington State Univ., Pullman, WA (United States)
- Michigan State Univ., East Lansing, MI (United States)
- Publication Date:
- Research Org.:
- Washington State Univ., Pullman, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDA; National Science Foundation (NSF)
- OSTI Identifier:
- 1798328
- Grant/Contract Number:
- SC0017160; MCB-1616982; 1005351; 0119; IOS-1847382; IOS-1847193; SR- 2016049
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Plants
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2055-0278
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Li, Meng, Svoboda, Vaclav, Davis, Geoffry, Kramer, David, Kunz, Hans-Henning, and Kirchhoff, Helmut. Impact of ion fluxes across thylakoid membranes on photosynthetic electron transport and photoprotection. United States: N. p., 2021.
Web. doi:10.1038/s41477-021-00947-5.
Li, Meng, Svoboda, Vaclav, Davis, Geoffry, Kramer, David, Kunz, Hans-Henning, & Kirchhoff, Helmut. Impact of ion fluxes across thylakoid membranes on photosynthetic electron transport and photoprotection. United States. https://doi.org/10.1038/s41477-021-00947-5
Li, Meng, Svoboda, Vaclav, Davis, Geoffry, Kramer, David, Kunz, Hans-Henning, and Kirchhoff, Helmut. Thu .
"Impact of ion fluxes across thylakoid membranes on photosynthetic electron transport and photoprotection". United States. https://doi.org/10.1038/s41477-021-00947-5. https://www.osti.gov/servlets/purl/1798328.
@article{osti_1798328,
title = {Impact of ion fluxes across thylakoid membranes on photosynthetic electron transport and photoprotection},
author = {Li, Meng and Svoboda, Vaclav and Davis, Geoffry and Kramer, David and Kunz, Hans-Henning and Kirchhoff, Helmut},
abstractNote = {In photosynthetic thylakoid membranes the proton motive force (pmf) not only drives ATP synthesis, in addition it is central to controlling and regulating energy conversion. As a consequence, dynamic fine-tuning of the two pmf components, electrical (Δψ) and chemical (ΔpH), is an essential element for adjusting photosynthetic light reactions to changing environmental conditions. Good evidence exists that the Δψ/ΔpH partitioning is controlled by thylakoid potassium and chloride ion transporters and channels. However, a detailed mechanistic understanding of how these thylakoid ion transporter/channels control pmf partitioning is lacking. In this work, we combined functional measurements on potassium and chloride ion transporter and channel loss-of-function mutants with extended mathematical simulations of photosynthetic light reactions in thylakoid membranes to obtain detailed kinetic insights into the complex interrelationship between membrane energization and ion fluxes across thylakoid membranes. The data reveal that potassium and chloride fluxes in the thylakoid lumen determined by the K+/H+ antiporter KEA3 and the voltage-gated Cl– channel VCCN1/Best1 have distinct kinetic responses that lead to characteristic and light-intensity-dependent Δψ/ΔpH oscillations. These oscillations fine-tune photoprotective mechanisms and electron transport which are particularly important during the first minutes of illumination and under fluctuating light conditions. By employing the predictive power of the model, we unravelled the functional consequences of changes in KEA3 and VCCN1 abundance and regulatory/enzymatic parameters on membrane energization and photoprotection.},
doi = {10.1038/s41477-021-00947-5},
journal = {Nature Plants},
number = ,
volume = 7,
place = {United States},
year = {Thu Jun 17 00:00:00 EDT 2021},
month = {Thu Jun 17 00:00:00 EDT 2021}
}
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