Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8298619 | Biochimica et Biophysica Acta (BBA) - Bioenergetics | 2018 | 10 Pages |
Abstract
Utilization of electrons from the photosynthetic water splitting reaction for the generation of biofuels, commodities as well as application in biotransformations requires a partial rerouting of the photosynthetic electron transport chain. Due to its rather negative redox potential and its bifurcational function, ferredoxin at the acceptor side of Photosystem 1 is one of the focal points for such an engineering. With hydrogen production as model system, we show here the impact and potential of redox partner design involving ferredoxin (Fd), ferredoxin-oxido-reductase (FNR) and [FeFe]âhydrogenase HydA1 on electron transport in a future cyanobacterial design cell of Synechocystis PCC 6803. X-ray-structure-based rational design and the allocation of specific interaction residues by NMR-analysis led to the construction of Fd- and FNR-mutants, which in appropriate combination enabled an about 18-fold enhanced electron flow from Fd to HydA1 (in competition with equimolar amounts of FNR) in in vitro assays. The negative impact of these mutations on the Fd-FNR electron transport which indirectly facilitates H2 production (with a contribution of â¤42% by FNR variants and â¤23% by Fd-variants) and the direct positive impact on the Fd-HydA1 electron transport (â¤23% by Fd-mutants) provide an excellent basis for the construction of a hydrogen-producing design cell and the study of photosynthetic efficiency-optimization with cyanobacteria.
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Authors
Wiegand K., Winkler M., Rumpel S., Kannchen D., Rexroth S., Hase T., Farès C., Happe T., Lubitz W., Rögner M.,