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An efficient method for targeted cloning of large DNA fragments from Streptomyces

  • Applied Genetics and Molecular Biotechnology
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Abstract

Cloning of large DNA fragments from microorganisms becomes increasingly important but remains seriously challenging due to the complexity and diversity of genetic background. In particular, the methods with high precision and efficiency are in great need for obtaining intact biosynthetic gene clusters (BGCs) of microbial natural products. Here, we report a new strategy for targeted cloning of large DNA fragments (TCLD) from different bacteria. Using this method, precise cloning of desired E. coli chromosomal fragments up to 201 kb was achieved with 53% positive rate. Moreover, its application in cloning of large BGCs with high G + C content and multiple repetitive sequences was also demonstrated, including the 98 kb tylosin BGC (tyl), 128 kb daptomycin BGC (dpt), and 127 kb salinomycin BGC (sal). Subsequently, heterologous expression of the cloned tyl BGC in Streptomyces coelicolor M1146 led to the production of tylosins in the resulting recombinant strains. And also, its introduction into Streptomyces fradiae ATCC 19609, a native producer of tylosin, effectively increased tylosin yield to 230%. Hence, TCLD is a powerful tool for cloning large BGCs and would facilitate the discovery of bioactive substances from microbial resources.

Key points

• TCLD is an efficient method for cloning large DNA fragments.

• Repeat sequence-mediated intra-molecular cyclization improves the cloning efficiency.

• TCLD combined with scarless editing allows unlimited modifications on BGCs.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

We are grateful to Dr. Wenzhao Wang (Institute of Microbiology, Chinese Academy of Sciences) for his assistance in the analysis of mass spectrometry.

Funding

This work was supported by the National Key Research and Development Program of China (grant number 2018YFA0901900), the National Natural Science Foundation of China (grant numbers 32270055 and 82173720), and Beijing Natural Science Foundation (grant number 7212153).

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Contributions

JL, JZ, and YT conceived and designed the research. YT, DL, KW, and BW conducted experiments. YT, JL, and JZ analyzed data. The manuscript was written by JL, JZ, YT, and DL. All the authors read and approved the manuscript.

Corresponding authors

Correspondence to Jihui Zhang or Jine Li.

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This article does not contain any studies with animals performed by any of the authors.

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The authors declare no competing interests.

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Tian, Y., Li, D., Wang, K. et al. An efficient method for targeted cloning of large DNA fragments from Streptomyces. Appl Microbiol Biotechnol 107, 5749–5760 (2023). https://doi.org/10.1007/s00253-023-12685-z

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  • DOI: https://doi.org/10.1007/s00253-023-12685-z

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