Abstract
Although 1,3-propanediol (1,3-PD) is usually considered an anaerobic fermentation product from glycerol by Klebsiella pneumoniae, microaerobic conditions proved to be more conducive to 1,3-PD production. In this study, a genome-scale metabolic model (GSMM) specific to K. pneumoniae KG2, a high 1.3-PD producer, was constructed. The iZY1242 model contains 2090 reactions, 1242 genes and 1433 metabolites. The model was not only able to accurately characterise cell growth, but also accurately simulate the fed-batch 1,3-PD fermentation process. Flux balance analyses by iZY1242 was performed to dissect the mechanism of stimulated 1,3-PD production under microaerobic conditions, and the maximum yield of 1,3-PD on glycerol was 0.83 mol/mol under optimal microaerobic conditions. Combined with experimental data, the iZY1242 model is a useful tool for establishing the best conditions for microaeration fermentation to produce 1,3-PD from glycerol in K. pneumoniae.
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The data that supports the findings of this study are available in the supplementary material of this article.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China under Grant No. 31271862.
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YZ and HG conceived and designed the study. YZ constructed the model. YZ, WT and JT implemented the experiment. YZ, BL and LG collected the background information. YZ, MY, YB and SF checked the data of this study. YZ and HG drafted and edited the manuscript. All authors reviewed and approved the final manuscript.
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Supplementary file 1. Table S1
: M9 minimal medium composition in silico. (XLSX 11 KB)
Supplementary file 2. Table S2
: Shake flask culture medium composition in silico. (XLSX 11 KB)
Supplementary file 3. Table S3
: The results of Biolog Phenotypic Microarray assay. (XLSX 19 KB)
Supplementary file 4. Table S4
: Reactions and metabolites added to iZY1242 model that not present in BIGG database before. (XLSX 10 KB)
Supplementary file 5. Table S5
: The flowchart for the construction of iZY1242 model. (XLSX 15 KB)
Supplementary file 6. Data Sheet 1
: (ZIP 964KB)
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Zhang, Y., Yang, M., Bao, Y. et al. A genome-scale metabolic model of the effect of dissolved oxygen on 1,3-propanediol fermentation by Klebsiella pneumoniae. Bioprocess Biosyst Eng 46, 1319–1330 (2023). https://doi.org/10.1007/s00449-023-02899-w
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DOI: https://doi.org/10.1007/s00449-023-02899-w