Abstract
The glycopeptide A40926 biosynthesized by Nonomuraea gerenzanensis is a precursor of the second generation glycopeptide antibiotic dalbavancin. The skeleton of this glycopeptide consists of seven amino acids and is biosynthesized by the NRPS gene module. L-valine, a branched amino acid, is also a significant precursor for A40926 production. This study details the use of pH-responsive alginate–chitosan microspheres loaded with L-valine prepared by internal emulsification gelation. The effects of process and formulation variables on microsphere size, loading capacity, and encapsulation efficiency were investigated. Then, effects on A40926 production by the pH-responsive microspheres were evaluated in a 10-L fermenter. Results demonstrated that use of the pH-responsive microspheres could improve A40926 yield from 465 to 602 mg L−1 in a 10-L scale fermenter.
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Acknowledgements
This work was supported by the Natural Science Foundation of Shandong Province (Grant No. ZR2015CL001).
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YX, YBY, and DHJ designed and planed the experimental work of this study and drafted this manuscript. YX performed most of the experiments in this work. YBY contributed to preparation of the pH-responsive alginate–chitosan microspheres and partial microbial cultivation work. WS and GW assisted in interpreting the data and revised the manuscript. ZRY advised the project and was involved in revising the manuscript.
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Yue, X., Yan, B., Wang, S. et al. Preparation of pH-Responsive Alginate–Chitosan Microspheres for L-Valine Loading and Their Effects on the A40926 Production. Curr Microbiol 77, 1016–1023 (2020). https://doi.org/10.1007/s00284-020-01894-8
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DOI: https://doi.org/10.1007/s00284-020-01894-8