Abstract
Hyaluronic acid (HA) is a high value glycosaminoglycan mostly used in health and cosmetic applications. Commercial HA is produced from animal tissues or in toxigenic bacteria of the genus Streptococcus grown in complex media, which are expensive and raise environmental concerns due to the disposal of large amounts of broth with high organic loads. Other microorganisms were proposed as hosts for the heterologous production of HA, but the methods are still costly. The extraordinary capacity of this biopolymer to bind and retain water attracts interest for large-scale applications where biodegradable materials are needed, but its high cost and safety concerns are barriers for its adoption. Bacillus subtilis 3NA strain is prototrophic, amenable for genetic manipulation, GRAS, and can rapidly reach high cell densities in salt-based media. These phenotypic traits were exploited to create a platform for biomolecule production using HA as a proof of concept. First, the 3NA strain was engineered to produce HA; second, a chemically defined medium was formulated using commodity-priced inorganic salts combined at the stoichiometric ratios needed to build the necessary quantities of biomass and HA; and third, a scalable fermentation process, where HA can be produced at the maximum volumetric productivity (VP), was designed. A comparative economic analysis against other methods indicates that the new process may increase the operating profit of a manufacturing plant by more than 100%. The host, the culture medium, and the rationale employed to develop the fermentation process described here, introduce an IP-free platform that could be adaptable for production of other biomolecules.
Key points
• A biomolecule production platform based on B. subtilis 3NA strain and a synthetic medium was tested for hyaluronic acid biosynthesis
• A fermentation process with the maximum volumetric productivity was designed
• A techno-economic analysis forecasts a significant reduction in the manufacturing cost compared to the current methods
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Data availability
All data generated or analyzed during this study are included in this published article and its supplementary information files.
Change history
23 August 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00253-021-11506-5
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Acknowledgements
The authors want to acknowledge Juan Diego All, Mauro Nicolás Cerchi, and Claudio Exequiel Cansino Quispe for their technical assistance.
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Part of this work was supported by Glyco@Alps (ANR-15-IDEX-02).
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SC, HM, and BP conceived and designed research. SC, ML, SP, and PA conducted experiments. BP and JCA contributed new reagents or analytical tools. SC and HM analyzed data. SC and HM wrote the manuscript. All authors read and approved the manuscript.
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Cerminati, S., Leroux, M., Anselmi, P. et al. Low cost and sustainable hyaluronic acid production in a manufacturing platform based on Bacillus subtilis 3NA strain. Appl Microbiol Biotechnol 105, 3075–3086 (2021). https://doi.org/10.1007/s00253-021-11246-6
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DOI: https://doi.org/10.1007/s00253-021-11246-6