A voltage-dependent chloride channel fine-tunes photosynthesis in plants

Andrei Herdean, Enrico Teardo, Anders K. Nilsson, Bernard E. Pfeil, Oskar N. Johansson, Renáta Ünnep, Gergely Nagy, Ottó Zsiros, Somnath Dana, Katalin Solymosi, Gyozo Garab, Ildikó Szabó, Cornelia Spetea, Björn Lundin

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Abstract

In natural habitats, plants frequently experience rapid changes in the intensity of sunlight. To cope with these changes and maximize growth, plants adjust photosynthetic light utilization in electron transport and photoprotective mechanisms. This involves a proton motive force (PMF) across the thylakoid membrane, postulated to be affected by unknown anion (Cl -) channels. Here we report that a bestrophin-like protein from Arabidopsis thaliana functions as a voltage-dependent Cl - channel in electrophysiological experiments. AtVCCN1 localizes to the thylakoid membrane, and fine-tunes PMF by anion influx into the lumen during illumination, adjusting electron transport and the photoprotective mechanisms. The activity of AtVCCN1 accelerates the activation of photoprotective mechanisms on sudden shifts to high light. Our results reveal that AtVCCN1, a member of a conserved anion channel family, acts as an early component in the rapid adjustment of photosynthesis in variable light environments.

Original languageEnglish
Article number11654
JournalNature communications
Volume7
DOIs
Publication statusPublished - May 24 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Herdean, A., Teardo, E., Nilsson, A. K., Pfeil, B. E., Johansson, O. N., Ünnep, R., Nagy, G., Zsiros, O., Dana, S., Solymosi, K., Garab, G., Szabó, I., Spetea, C., & Lundin, B. (2016). A voltage-dependent chloride channel fine-tunes photosynthesis in plants. Nature communications, 7, [11654]. https://doi.org/10.1038/ncomms11654