Abstract
Cat8 is a C6 zinc cluster transcription activator in yeast. It is generally recognized that the transcription of CAT8 is inhibited and that Cat8 is inactive in the presence of high concentrations of glucose. However, our recent study found that constitutively overexpressed Cat8 played a regulatory role in Saccharomyces cerevisiae in the presence of 20 g/L glucose. To explore the regulatory network of Cat8 at high glucose concentrations, CAT8 was both overexpressed and deleted in this study. Cell growth and glucose consumption in different media were significantly accelerated by the deletion of CAT8, while the lag period was greatly shortened. RNA-seq and genetic modification showed that the deletion of CAT8 changed the type of energy metabolism in yeast cells. Many genes related to the mitochondrial respiratory chain were downregulated, resulting in a reduction in aerobic respiration and the tricarboxylic acid cycle. Meanwhile, both the energy supply of anaerobic ethanol fermentation and the Crabtree effect of S. cerevisiae were enhanced by the deletion of CAT8. CAT8 knockout cells show a higher sugar uptake rate, a higher cell growth rate, and higher tolerance to glucose than the wild-type strain YS58. This study expands the understanding of the regulatory network of Cat8 and provides guidance for modulating yeast cell growth.
Key points
• The deletion of CAT8 promoted cell growth of S. cerevisiae.
• Transcriptome analysis revealed the regulation network of Cat8 under 1% glucose condition.
• CAT8 deletion increases the glucose tolerance of cells by enhancing the Crabtree effect.
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Data availability
RNA sequencing data have been deposited at the National Microbiology Data Center (NMDC) with Accession Number NMDC10018227.
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HD designed the research, performed the experiments, analyzed the data, and wrote the manuscript. ZD and SL provided methodology, data analysis, and experimental assistance. ZW and XH supervised the overall progress and reviewed the manuscript. All authors read and approved the manuscript. HD and ZW comprehensively revised the paper.
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Deng, H., Du, Z., Lu, S. et al. Regulation of Cat8 in energy metabolic balance and glucose tolerance in Saccharomyces cerevisiae. Appl Microbiol Biotechnol 107, 4605–4619 (2023). https://doi.org/10.1007/s00253-023-12593-2
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DOI: https://doi.org/10.1007/s00253-023-12593-2