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- Enhanced Poly-γ-Glutamic Acid Production by a Newly Isolated Bacillus halotolerans F29
- Xiaorong Sun, Yaoyu Cai, Dexin Wang
- J. Microbiol. 2024;62(8):695-707. Published online August 20, 2024
- DOI: https://doi.org/10.1007/s12275-024-00153-w
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Abstract
PDF - Poly-γ-glutamic acid (γ-PGA) is a promising biopolymer for various applications. In this study, we isolated a novel γ-PGA-producing strain, Bacillus halotolerans F29. The one-factor-at-a-time method was used to investigate the influence of carbon sources, nitrogen sources, and culture parameters on γ-PGA production. The optimal carbon and nitrogen sources were sucrose and (NH4)2SO4, respectively. The optimal culture conditions for γ-PGA production were determined to be 37 °C and a pH of 5.5. Response surface methodology was used to determine the optimum medium components: 77.6 g/L sucrose, 43.0 g/L monosodium glutamate, and 2.2 g/L K2HPO4. The γ-PGA titer increased significantly from 8.5 ± 0.3 g/L to 20.7 ± 0.7 g/L when strain F29 was cultivated in the optimized medium. Furthermore, the γ-PGA titer reached 50.9 ± 1.5 g/L with a productivity of 1.33 g/L/h and a yield of 2.23 g of γ-PGA/g of L-glutamic acid with the optimized medium in fed-batch fermentation. The maximum γ-PGA titer reached 45.3 ± 1.1 g/L, with a productivity of 1.06 g/L/h when molasses was used as a carbon source. It should be noted that the γ-PGA yield in this study was the highest of all reported studies, indicating great potential for the industrial production of γ-PGA.
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Citations
Citations to this article as recorded by
- Investigation of glutamic acid production capacity of Stenotrophomonas sp. strain CG2 isolated from soil
Cihat Guner, Ertan Ermis, Kubra Ozkan Guner
Biocatalysis and Agricultural Biotechnology.2025; 67: 103665. CrossRef - Metabolic engineering of microorganisms for tailor-made biopolymer production: A review
Mădălina Lorena Medeleanu, Lavinia-Florina Călinoiu, Gheorghe-Adrian Martău, Dan-Cristian Vodnar
International Journal of Biological Macromolecules.2025; 330: 147922. CrossRef - Poly-γ-glutamic acid production from untreated sugarcane molasses by non-sterilized repeated-batch fermentation with Bacillus subtilis GLS-8
Yu Lin, Lin Shu, Huizhen Chen, Xiaoqun Duan, Wei Zeng
Chemical Engineering Journal Advances.2025; 24: 100900. CrossRef - Transcriptomics-guided rational engineering in Bacillus licheniformis for enhancing poly-γ-glutamic acid biosynthesis using untreated molasses
Rui Han, Qian Zhong, Yifan Yan, Juan Wang, Yifan Zhu, Sha Li, Peng Lei, Rui Wang, Yibin Qiu, Zhengshan Luo, Hong Xu
International Journal of Biological Macromolecules.2024; 282: 137514. CrossRef
- Investigation of glutamic acid production capacity of Stenotrophomonas sp. strain CG2 isolated from soil
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