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- W4315709212 abstract "Nitrogenase-mediated H production using heterocyst-forming cyanobacteria represents a promising approach as the process is naturally protected from O -rich environments by being restricted to heterocysts. This work investigates the impact of the deletion of the vegetative cell-specific flavodiiron protein, Flv3A, on the long-term H photoproduction of the model heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. The H photoproduction was evaluated in response to the presence and/or absence of N and O in the atmosphere, and in comparison to the uptake hydrogenase (Hup) deletion mutant. We demonstrate that the sole deletion of Flv3A facilitates a prolonged H photoproduction catalyzed by nitrogenase even under oxic conditions. Deletion of Flv3A did not affect the nitrogenase activity, neither its efficiency to allocate electrons to H production, nor the accumulation of sugars in the cells. Besides the transcriptional repression of hupL , the deletion of Flv3A promotes a higher O tolerance of the nitrogenase-mediated H photoproduction. Our results suggest that, in the absence of Hup, Flv3A might play a role in sustaining long-term H photoproduction under nitrogen-depleted oxic conditions. The present findings expand our understanding of nitrogenase-driven H production and offer a new possibility to overcome the current bottlenecks attained to photobiological H production in a long-term process." @default.
- W4315709212 created "2023-01-12" @default.
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- W4315709212 date "2023-01-12" @default.
- W4315709212 modified "2023-10-17" @default.
- W4315709212 title "Deletion of Flv3A facilitates long-term H 2 photoproduction in diazotrophic Anabaena sp. PCC 7120 under oxic conditions" @default.
- W4315709212 doi "https://doi.org/10.22541/au.167354824.44269064/v1" @default.
- W4315709212 hasPublicationYear "2023" @default.
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