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Multicopy Chromosome Integration and Deletion of Negative Global Regulators Significantly Increased the Heterologous Production of Aborycin in Streptomyces coelicolor
Li, J.-Y.; Liang, J.-Y.; Liu, Z.-Y.; Yi, Y.-Z.; Zhao, J.; Huang, Z.-Y.; Chen, J. Multicopy Chromosome Integration and Deletion of Negative Global Regulators Significantly Increased the Heterologous Production of Aborycin in Streptomyces coelicolor. Mar. Drugs2023, 21, 534.
Li, J.-Y.; Liang, J.-Y.; Liu, Z.-Y.; Yi, Y.-Z.; Zhao, J.; Huang, Z.-Y.; Chen, J. Multicopy Chromosome Integration and Deletion of Negative Global Regulators Significantly Increased the Heterologous Production of Aborycin in Streptomyces coelicolor. Mar. Drugs 2023, 21, 534.
Li, J.-Y.; Liang, J.-Y.; Liu, Z.-Y.; Yi, Y.-Z.; Zhao, J.; Huang, Z.-Y.; Chen, J. Multicopy Chromosome Integration and Deletion of Negative Global Regulators Significantly Increased the Heterologous Production of Aborycin in Streptomyces coelicolor. Mar. Drugs2023, 21, 534.
Li, J.-Y.; Liang, J.-Y.; Liu, Z.-Y.; Yi, Y.-Z.; Zhao, J.; Huang, Z.-Y.; Chen, J. Multicopy Chromosome Integration and Deletion of Negative Global Regulators Significantly Increased the Heterologous Production of Aborycin in Streptomyces coelicolor. Mar. Drugs 2023, 21, 534.
Abstract
Aborycin is a type I lasso peptide with a stable interlocked structure, offering a favorable framework for drug development. The aborycin biosynthetic gene cluster gul from marine sponge-associated Streptomyces sp. HNS054 was cloned and integrated into the chromosome of S. coelicolor hosts with different copies. The 3-copy gul-integration strains S. coelicolor M1346::3gul showed better production than one-copy or 2-copy gul-integration strains, and the total titer reached approximately 10.4 mg/L, i.e., 2.1 times that of the native strain. Then, five regulatory genes, phoU (SCO4228), wblA (SCO3579), SCO1712, orrA (SCO3008) and gntR (SCO1678), which were reported to have negative effects on secondary metabolism, were further knocked out from the M1346::3gul genome by CRISPR/Cas9 technology. While the ΔSCO1712 mutant showed a significant decrease (4.6 mg/L) and the ΔphoU mutant showed no significant improvement (12.1 mg/L) in aborycin production, the ΔwblA, ΔorrA and ΔgntR mutations significantly improved the aborycin titers to approximately 23.6 mg/L, 56.3 mg/L and 48.2 mg/L, respectively, which were among the highest heterologous yields for lasso peptides in both Escherichia coli systems and Streptomyces systems. Thus, this study provided important clues for future studies on enhancing antibiotic production in Streptomyces systems.
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