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Highly Efficient Artificial Photosynthesis by Sporomusa ovata-CdS Biohybrid System

ABSTRACT: We constructed the electroautotrophic bacteria, i.e., Sporomusa ovata together with CdS for artificial photosynthesis that achieved the conversion of carbon dioxide to the acetate. The proteomic analysis in S.ovata-CdS biohybrids and S.ovata-only groups was conducted to propose the working mechanisms including carbon dioxide fixation, electron transfer, energy metabolism and redox oxygen damage repair.

ORGANISM(S): Sporomusa Ovata Dsm 2662

SUBMITTER: Liang Qiao

PROVIDER: PXD027986 | iProX | Wed Aug 18 00:00:00 BST 2021

REPOSITORIES: iProX

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Project description:Marine phytoplankton are a diverse group of photoautotrophic organisms and key mediators in the global carbon cycle. Phytoplankton physiology and biomass accumulation are closely tied to mixed layer depth, but the intracellular metabolic pathways activated in response to changing mixed layer depths remain unexplored. Here, metatranscriptomics was used to characterize the phytoplankton community response to a mixed layer shallowing from 233 meters to 5 meters over the course of two days during the late spring in the Northwest Atlantic. Most phytoplankton genera downregulated core photosynthesis, carbon storage, and carbon fixation genes as the system transitioned from a deep to a shallow mixed layer and shifted towards catabolism of stored carbon ic pathways supportive of rapid cell growth. In contrast, phytoplankton genera exhibited divergent transcriptional strategies for photosystem light harvesting complex genes during this transition. Active infection, taken as the ratio of virus to host transcripts, increased in the Bacillariophyta (diatom) phylum and decreased in the Chlorophyta (green algae) phylum upon mixed layer shallowing. A conceptual model is proposed to provide ecophysiological context for our findings, in which light limitation during deep mixing induces populations into a transcriptional state which maximizes interrupts the oscillating levels of transcripts related to photosynthesis, carbon storage, and carbon fixation found in shallow mixed layers with relatively higher growth rates. We propose that upon sensing high light levels during mixed layer shallowing, phytoplankton resume diel oscillation of core sets of genes enabling photoprotection, biosynthesis and cell replication. Our findings highlight the shared and unique transcriptional response strategies within phytoplankton communities acclimating to the dynamic light environment associated with transient deep mixing and shallowing events during the annual North Atlantic bloom.

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Highly Efficient Artificial Photosynthesis by Sporomusa ovata-CdS Biohybrid System

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