Chloroplast-localized BICAT proteins shape stromal calcium signals and are required for efficient photosynthesis

The New Phytologist
Julia FrankEdgar Peiter

Abstract

The photosynthetic machinery of plants must be regulated to maximize the efficiency of light reactions and CO2 fixation. Changes in free Ca2+ in the stroma of chloroplasts have been observed at the transition between light and darkness, and also in response to stress stimuli. Such Ca2+ dynamics have been proposed to regulate photosynthetic capacity. However, the molecular mechanisms of Ca2+ fluxes in the chloroplasts have been unknown. By employing a Ca2+ reporter-based approach, we identified two chloroplast-localized Ca2+ transporters in Arabidopsis thaliana, BICAT1 and BICAT2, that determine the amplitude of the darkness-induced Ca2+ signal in the chloroplast stroma. BICAT2 mediated Ca2+ uptake across the chloroplast envelope, and its knockout mutation strongly dampened the dark-induced [Ca2+ ]stroma signal. Conversely, this Ca2+ transient was increased in knockout mutants of BICAT1, which transports Ca2+ into the thylakoid lumen. Knockout mutation of BICAT2 caused severe defects in chloroplast morphology, pigmentation and photosynthetic light reactions, rendering bicat2 mutants barely viable under autotrophic growth conditions, while bicat1 mutants were less affected. These results show that BICAT transporters play a role i...Continue Reading

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Citations

Oct 24, 2019·The New Phytologist·María Carmen Martí RuizAlex A R Webb
Feb 13, 2020·The Journal of Biological Chemistry·Jiri StribnyPierre Morsomme
Apr 1, 2020·Frontiers in Plant Science·Lorella NavazioIldikò Szabò
Apr 11, 2020·Frontiers in Plant Science·Santiago AlejandroEdgar Peiter
Jun 12, 2019·Nature Plants·Simon Stael
Jan 10, 2021·Biochimica Et Biophysica Acta. Molecular Cell Research·Niloufar PirayeshFatima Chigri
Jan 28, 2021·Journal of Experimental Botany·Khurram BashirNaoko K Nishizawa
Apr 28, 2021·Current Biology : CB·Pirita PaajanenAntony N Dodd
Jun 3, 2021·Journal of Experimental Botany·Matteo Pivato, Matteo Ballottari
Aug 29, 2021·Plants·Nikolina VidovićSmiljana Goreta Ban
Apr 28, 2021·Plant Physiology·Francesca ResentiniAlex Costa

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