Engineered Biosynthesis of 5/5/6 Type Polycyclic Tetramate Macrolactams in an Ikarugamycin (5/6/5 Type)-Producing
Hongbo Jin1,2, Wenjun Zhang1, Guangtao Zhang1
1Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Key Laboratory of Marine Materia Medica, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, China.
Abstract:
Combinatorial biosynthesis of 5/5/6 type polycyclic tetramate macrolactams (PoTeMs) was achieved in an engineered ikarugamycin (5/6/5 type) producer by introducing a set of 5/5/6 type PoTeM biosynthetic genes from Streptomyces griseus. This study supports the idea that PoTeMs share a common polyene tetramate precursor generated by the hybrid polyketide synthase/nonribosomal peptide synthetase enzymes. The X-ray crystal structure of pactamide G (7) sets an example for resolving the absolute configuration of 5/5/6 type PoTeMs.
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