Abstract
Mitochondrial pyruvate carriers (MPCs), located in the inner membrane of mitochondria, are essential carriers for pyruvate to enter mitochondria. MPCs regulate a wide range of intracellular metabolic processes, such as glycolysis, the tricarboxylic acid cycle (TCA cycle), fatty acid metabolism, and amino acid metabolism. However, the metabolic regulation of MPCs in macrofungi is poorly studied. We studied the role of MPCs in Ganoderma lucidum (GlMPC) on ganoderic acid (GA) biosynthesis regulation in G. lucidum. In this study, we found that the mitochondrial/cytoplasmic ratio of pyruvate was downregulated about 75% in GlMPC1- and GlMPC2-silenced transformants compared with wild type (WT). In addition, the GA content was 17.72 mg/g and increased by approximately 50% in GlMPC1- and GlMPC2-silenced transformants compared with WT. By assaying the expression levels of three key enzymes and the enzyme activities of isocitrate dehydrogenase (IDH) and α-ketoglutarate dehydrogenase (α-KGDH) of the TCA cycle in GlMPC1- and GlMPC2-silenced transformants, it was found that the decrease in GlMPCs activity did not significantly downregulate the TCA cycle rate, and the enzyme activity of IDH increased by 44% compared with WT. We then verified that fatty acid β-oxidation (FAO) supplements the TCA cycle by detecting the expression levels of key enzymes involved in FAO. The results showed that compared with WT, the GA content was 1.14 mg/g and reduced by approximately 40% in co-silenced transformants.
Key points
• GlMPCs affects the distribution of pyruvate between mitochondria and the cytoplasm.
• Acetyl-CoA produced by FAO maintains the TCA cycle.
• Acetyl-CoA produced by FAO promotes the accumulation of GA.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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This work was financially supported by the China Agriculture Research System of MOF and MARA (NO. CARS20).
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JHC designed the experiments and was a major contributor to the data analysis and writing of the manuscript. WZX, ZW, LT, and WDL were involved in data analysis and were major contributors to the experiments. AR, RL, and JZ financed the research. LS helped JHC conduct some of the experiments. All authors read and approved the manuscript.
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Chen, J., Xu, W., Wang, Z. et al. Mitochondrial pyruvate carrier influences ganoderic acid biosynthesis in Ganoderma lucidum. Appl Microbiol Biotechnol 107, 1361–1371 (2023). https://doi.org/10.1007/s00253-022-12357-4
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DOI: https://doi.org/10.1007/s00253-022-12357-4