Abstract
The yeast Dekkera bruxellensis is well-known for its adaptation to industrial ethanol fermentation processes, which can be further improved if nitrate is present in the substrate. To date, the assimilation of nitrate has been considered inefficient because of the apparent energy cost imposed on cell metabolism. Recent research, however, has shown that nitrate promotes growth rate and ethanol yield when oxygen is absent from the environment. Given this, the present work aimed to identify the biological mechanisms behind this physiological behaviour. Proteomic analyses comparing four contrasting growth conditions gave some clues on how nitrate could be used as primary nitrogen source by D. bruxellensis GDB 248 (URM 8346) cells in anaerobiosis. The superior anaerobic growth in nitrate seems to be a consequence of increased cell metabolism (glycolytic pathway, production of ATP and NADPH and anaplerotic reactions providing metabolic intermediates) regulated by balanced activation of TORC1 and NCR de-repression mechanisms. On the other hand, the poor growth observed in aerobiosis is likely due to an oxidative stress triggered by nitrate when oxygen is present. These results represent a milestone regarding the knowledge about nitrate metabolism and might be explored for future use of D. bruxellensis as an industrial yeast.
Key points
• Nitrate can be regarded as preferential nitrogen source for D. bruxellensis.
• Oxidative stress limits the growth of D. bruxellensis in nitrate in aerobiosis.
• Nitrate is a nutrient for novel industrial bioprocesses using D. bruxellensis.
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Data availability statement
All data generated or analysed during this study are included in this published article (and its supplementary information files) and further information are available from the corresponding author on reasonable request.
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Acknowledgements
The authors gratefully thank the technical staff of the Northern Centre for Technological Strategies CETENE (Recife, Pernambuco, Brazil at https://www.cetene.gov.br/) for their kind help with MALDI-ToF and MS analyses and Dr. Jimmy Eng of the Centre for Advanced Proteomics of the University of Washington (Seattle, WA, USA at http://proteomicsresource.washington.edu/) for the use of MASCOT with the specific D. bruxellensis database. The English text of this paper has been revised by Sidney Pratt, Canadian, MAT (The Johns Hopkins University), RSAdip - TESL (Cambridge University).
Funding
This work was sponsored by grants of the National Council of Science and Technology (CNPq/process 409767/2018-2 and CNPq/process 303551/2017-8) and by the Bioethanol Research Network of the State of Pernambuco (CNPq-FACEPE/PRONEM APQ-1452-2.01/10).
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MAMJ, WBP and TCJ conceived and designed the research. ICPM, DCP, KMS and EPNP conducted the experiments. ICPM, DCP, EPNP and FACS performed the proteome annotation and GO analyses. ICPM, WBP, TCJ and MAMJ prepared the manuscript. All authors read and approved the submitted manuscript.
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Peña-Moreno, I.C., Parente, D.C., da Silva, K.M. et al. Comparative proteomic analyses reveal the metabolic aspects and biotechnological potential of nitrate assimilation in the yeast Dekkera bruxellensis. Appl Microbiol Biotechnol 105, 1585–1600 (2021). https://doi.org/10.1007/s00253-021-11117-0
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DOI: https://doi.org/10.1007/s00253-021-11117-0