Abstract
Reactive Oxygen Species (ROS) play an important role in oxidative stress and are related to the lipid accumulation in microalgae. Nicotinamide Adenine Dinucleotide Phosphate (NADPH) oxidase can oxidize O2 to O2− ultimately. However, the function of NADPH oxidase and its contribution to the production of the intracellular total ROS are still unclear. In this study, the function of NADPH oxidase in Chlorella pyrenoidosa (C. pyrenoidosa) was investigated by adding activators Ca2+ and NADPH and inhibitors EGTA, LaCl3, DPI and BAPTA of NADPH oxidase. The results show that the addition of activators of Ca2+ or NADPH significantly increased the intracellular concentrations of ROS molecules (H2O2, O2−, and OH·) in C. pyrenoidosa. Moreover, the intracellular ROS level was higher under the nitrogen-deficient and phosphorus-deficient conditions than in control condition, but the addition of the inhibitors (EGTA, LaCl3, DPI, and BAPTA) of NADPH oxidase significantly reduced the intracellular concentrations of H2O2, O2−, and OH·. The study shows that NADPH oxidase actively participated in the production of intracellular ROS in C. pyrenoidosa, demonstrating that NADPH oxidase was another important element in the production of intracellular ROS in addition to mitochondria, chloroplasts and lysozymes in microalgae.
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Funding
This work was supported by the Foundation and Frontier Research Project of Chongqing of China (Grant No. cstc2020jcyj-msxmX0906), Scientific Research Project of Chongqing University of Technology (Grant Nos. 2019ZD105, 2019ZD107).
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Liu, M., Liu, Y., Zhang, L. et al. NADPH oxidase contributes to the production of reactive oxygen species in Chlorella pyrenoidosa. Biotechnol Lett 45, 199–207 (2023). https://doi.org/10.1007/s10529-022-03330-2
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DOI: https://doi.org/10.1007/s10529-022-03330-2