Reconstruction of a hybrid nucleoside antibiotic gene cluster based on scarless modification of large DNA fragments
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Genetic modification of large DNA fragments (gene clusters) is of great importance in synthetic biology and combinatorial biosynthesis as it facilitates rational design and modification of natural products to increase their value and productivity. In this study, we developed a method for scarless and precise modification of large gene clusters by using RecET/RED-mediated polymerase chain reaction (PCR) targeting combined with Gibson assembly. In this strategy, the biosynthetic genes for peptidyl moieties (HPHT) in the nikkomycin biosynthetic gene cluster were replaced with those for carbamoylpolyoxamic acid (CPOAA) from the polyoxin biosynthetic gene cluster to generate a ~40 kb hybrid gene cluster in Escherichia coli with a reusable targeting cassette. The reconstructed cluster was introduced into Streptomyces lividans TK23 for heterologous expression and the expected hybrid antibiotic, polynik A, was obtained and verified. This study provides an efficient strategy for gene cluster reconstruction and modification that could be applied in synthetic biology and combinatory biosynthesis to synthesize novel bioactive metabolites or to improve antibiotic production.
Keywordslarge DNA fragment PCR targeting Gibson assembly gene cluster hybrid antibiotic
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This work was supported by grants from the Ministry of Science and Technology of China (2013CB734001 and 2015CB150600) and the National Natural Science Foundation of China (31370097 and 31571281).
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