A1 Refereed original research article in a scientific journal

FdC1 and Leaf-Type Ferredoxins Channel Electrons From Photosystem I to Different Downstream Electron Acceptors




AuthorsXiaoqian Guan, Shuai Chen, Chia Pao Voon, Kam-Bo Wong, Mikko Tikkanen, Boon L. Lim

PublisherFRONTIERS MEDIA SA

Publication year2018

JournalFrontiers in Plant Science

Journal name in sourceFRONTIERS IN PLANT SCIENCE

Journal acronymFRONT PLANT SCI

Article numberARTN 410

Volume9

Number of pages12

ISSN1664-462X

DOIhttps://doi.org/10.3389/fpls.2018.00410(external)

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/31090752(external)


Abstract
Plant-type ferredoxins in Arabidopsis transfer electrons from the photosystem I to multiple redox-driven enzymes involved in the assimilation of carbon, nitrogen, and sulfur. Leaf-type ferredoxins also modulate the switch between the linear and cyclic electron routes of the photosystems. Recently, two novel ferredoxin homologs with extra C-termini were identified in the Arabidopsis genome (AtFdC1, AT4G14890; AtFdC2, AT1G32550). FdC1 was considered as an alternative electron acceptor of PSI under extreme ferredoxin-deficient conditions. Here, we showed that FdC1 could interact with some, but not all, electron acceptors of leaf-type Fds, including the ferredoxin-thioredoxin reductase (FTR), sulfite reductase (SiR), and nitrite reductase (NiR). Photoreduction assay on cytochrome c and enzyme assays confirmed its capability to receive electrons from PSI and donate electrons to the Fd-dependent SiR and NiR but not to the ferredoxin-NADP C oxidoreductase (FNR). Hence, FdC1 and leaf-type Fds may play differential roles by channeling electrons from photosystem I to different downstream electron acceptors in photosynthetic tissues. In addition, the median redox potential of FdC1 may allow it to receive electrons from FNR in non-photosynthetic plastids.

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