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Enhanced Production of Iturin A-2 Generated from Bacillus velezensis T701 and the Antitumor Activity of Iturin A-2 against Human Gastric Carcinoma Cells

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Abstract

Bacillus velezensis T701 was used to produce lipopeptide. Among the lipopeptide, iturin A-2 was of the highest antitumor activity. In order to get higher yield of iturin A-2, the fermentation conditions of strain T701 were modified by optimization of medium composition and culture conditions. It was found that the concentrations of sucrose and peptone, and fermentation time had a very significant effect on the yield of iturin A-2 and fermentation temperature had a great influence on both of the yield of iturin A-2 and the proportion of iturin A-2 in iturin A. Another important conclusion was that monovalent cation could enhance metabolic ability of strain T701 and promote the yield of iturin A-2. Finally, under the optimized fermentation conditions of strain T701, iturin A-2 accounted for 80.2% of iturin A in HPLC trace, compared with the reported value of 46.8%. The yield of iturin A-2 increased to 1056.9 mg l−1. After separated and purified, pure iturin A-2 was achieved and confirmed by MS and NMR. The IC50 values of iturin A-2 against human gastric carcinoma cells NCI-N87 and MGC 803 were (51.7 ± 5.7) and (41.2 ± 4.3) μg ml−1, respectively. This is the first report on gram-scale preparation of iturin A-2 which also exhibits inhibitory activity against gastric cancer.

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Acknowledgements

The authors acknowledge the financial support from the Natural Science Foundation of Hebei Province (CN) under Grant (Number B2016201031); and the Bureau of Science and Technology of Hebei Province (CN) under Grant (Numbers 20322901D and 21322802D).

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JJ designed and performed experiments; WL and HZ supervised, and coordinated the study; MH, JD, SF and SW contributed to data analysis; JJ wrote the first draft manuscript; WL and HZ contributed to manuscript editing. All authors contributed substantially to this research and approved the final manuscript.

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Correspondence to Honglei Zhang or Wei Li.

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Jiang, J., Han, M., Fu, S. et al. Enhanced Production of Iturin A-2 Generated from Bacillus velezensis T701 and the Antitumor Activity of Iturin A-2 against Human Gastric Carcinoma Cells. Int J Pept Res Ther 28, 27 (2022). https://doi.org/10.1007/s10989-021-10340-7

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