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- W2108679544 abstract "Ferredoxin:NADP oxidoreductases (FNRs) constitute a family of flavoenzymes that catalyze the exchange of reducing equivalents between one-electron carriers and the two-electron-carrying NADP(H). The main role of FNRs in cyanobacteria and leaf plastids is to provide the NADPH for photoautotrophic metabolism. In root plastids, a distinct FNR isoform is found that has been postulated to function in the opposite direction, providing electrons for nitrogen assimilation at the expense of NADPH generated by heterotrophic metabolism. A multiple gene family encodes FNR isoenzymes in plants, whereas there is only one FNR gene ( petH ) in cyanobacteria. Nevertheless, we detected two FNR isoforms in the cyanobacterium Synechocystis sp. strain PCC6803. One of them (FNR S ≈34 kDa) is similar in size to the plastid FNR and specifically accumulates under heterotrophic conditions, whereas the other one (FNR L ≈46 kDa) contains an extra N-terminal domain that allows its association with the phycobilisome. Site-directed mutants allowed us to conclude that the smaller isoform, FNR S , is produced from an internal ribosome entry site within the petH ORF. Thus we have uncovered a mechanism by which two isoforms are produced from a single gene, which is, to our knowledge, novel in photosynthetic bacteria. Our results strongly suggest that FNR L is an NADP + reductase, whereas FNR S is an NADPH oxidase." @default.
- W2108679544 created "2016-06-24" @default.
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- W2108679544 date "2006-11-28" @default.
- W2108679544 modified "2023-10-11" @default.
- W2108679544 title "A second isoform of the ferredoxin:NADP oxidoreductase generated by an in-frame initiation of translation" @default.
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- W2108679544 doi "https://doi.org/10.1073/pnas.0607718103" @default.
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