Modulation of Antioxidant Activity Enhances Photoautotrophic Cell Growth of Rhodobacter sphaeroides in Microbial Electrosynthesis

Yu Rim Lee, Soo Youn Lee, Jiye Lee, Hui Su Kim, Jin-Suk Lee, Won-Heong Lee and Sangmin Lee
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Yu Rim Lee: Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju 61003, Korea
Soo Youn Lee: Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju 61003, Korea
Jiye Lee: Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju 61003, Korea
Hui Su Kim: Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju 61003, Korea
Jin-Suk Lee: Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju 61003, Korea
Won-Heong Lee: Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Gwangju 61186, Korea
Sangmin Lee: Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research, Gwangju 61003, Korea

Energies, 2022, vol. 15, issue 3, 1-11

Abstract: Global warming is currently accelerating due to an increase in greenhouse gas emissions by industrialization. Microbial electrosynthesis (MES) using electroactive autotrophic microorganisms has recently been reported as a method to reduce carbon dioxide, the main culprit of greenhouse gas. However, there are still few cases of application of MES, and the molecular mechanisms are largely unknown. To investigate the growth characteristics in MES, we carried out growth tests according to reducing power sources in Rhodobacter sphaeroides . The growth rate was significantly lower when electrons were directly supplied to cells, compared to when hydrogen was supplied. Through a transcriptome analysis, we found that the expression of reactive oxygen species (ROS)-related genes was meaningfully higher in MES than in normal photoautotrophic conditions. Similarly, endogenous contents of H 2 O 2 were higher and peroxidase activities were lower in MES. The exogenous application of ascorbic acid, a representative biological antioxidant, promotes cell growth by decreasing ROS levels, confirming the inhibitory effects of ROS on MES. Taken together, our observations suggest that reduction of ROS by increasing antioxidant activities is important for enhancing the cell growth and production of CO 2 -converting substances such as carotenoids in MES in R. sphaeroides

Keywords: antioxidant; microbial electrosynthesis; Rhodobacter sphaeroides (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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