PETO Interacts with Other Effectors of Cyclic Electron Flow in Chlamydomonas

Molecular Plant
Hiroko TakahashiOlivier Vallon

Abstract

While photosynthetic linear electron flow produces both ATP and NADPH, cyclic electron flow (CEF) around photosystem I (PSI) and cytochrome b6f generates only ATP. CEF is thus essential to balance the supply of ATP and NADPH for carbon fixation; however, it remains unclear how the system tunes the relative levels of linear and cyclic flow. Here, we show that PETO, a transmembrane thylakoid phosphoprotein specific of green algae, contributes to the stimulation of CEF when cells are placed in anoxia. In oxic conditions, PETO co-fractionates with other thylakoid proteins involved in CEF (ANR1, PGRL1, FNR). In PETO-knockdown strains, interactions between these CEF proteins are affected. Anoxia triggers a reorganization of the membrane, so that a subpopulation of PSI and cytochrome b6f now co-fractionates with the CEF effectors in sucrose gradients. The absence of PETO impairs this reorganization. Affinity purification identifies ANR1 as a major interactant of PETO. ANR1 contains two ANR domains, which are also found in the N-terminal region of NdhS, the ferredoxin-binding subunit of the plant ferredoxin-plastoquinone oxidoreductase (NDH). We propose that the ANR domain was co-opted by two unrelated CEF systems (PGR and NDH), possib...Continue Reading

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Citations

Oct 21, 2016·Biochimica Et Biophysica Acta. Bioenergetics·Jooyeon JeongEonSeon Jin
Apr 2, 2016·Biochimica Et Biophysica Acta·Sebastian VeitTakahisa Ikegami
Sep 20, 2018·The Journal of Biological Chemistry·Felix BuchertFrancis-André Wollman
Feb 28, 2019·The Plant Journal : for Cell and Molecular Biology·Stefania ViolaYves Choquet
Nov 22, 2017·The Plant Journal : for Cell and Molecular Biology·Melis DünerAnja Hemschemeier
Mar 27, 2021·Plant & Cell Physiology·Fiamma Paolo Longoni, Michel Goldschmidt-Clermont

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