title: Biosynthesis of Polymyxins B, E, and P Using Genetically Engineered Polymyxin Synthetases in the Surrogate Host Bacillus subtilis.
abstract: The development of diverse polymyxin derivatives is needed to solve the toxicity and resistance problems of polymyxins. However, no platform has generated polymyxin derivatives by genetically engineering a polymyxin synthetase, which is a nonribosomal peptide synthetase. In this study, we present a two-step approach for the construction of engineered polymyxin synthetases by substituting the adenylation (A) domains of polymyxin A synthetase, which is encoded by the pmxABCDE gene cluster of Paenibacillus polymyxa E681. First, the seventh L-threonine-specific A-domain region in pmxA was substituted with the Lleucine- specific A-domain region obtained from P. polymyxa ATCC21830 to make polymyxin E synthetase, and then the sixth D-leucine-specific A-domain region (A6-D-Leu-domain) was substituted with the D-phenylalanine-specific A-domain region (A6-D-Phe-domain) obtained from P. polymyxa F4 to make polymyxin B synthetase. This step was performed in Escherichia coli on a pmxA-containing fosmid, using the lambda Red recombination system and the sacB gene as a counter-selectable marker. Next, the modified pmxA gene was fused to pmxBCDE on the chromosome of Bacillus subtilis BSK4dA, and the resulting recombinant strains BSK4-PB and BSK4-PE were confirmed to produce polymyxins B and E, respectively. We also succeeded in constructing the B. subtilis BSK4-PP strain, which produces polymyxin P, by singly substituting the A6-D-Leu-domain with the A6-D-Phe-domain. This is the first report in which polymyxin derivatives were generated by genetically engineering polymyxin synthetases. The two recombinant B. subtilis strains will be useful for improving the commercial production of polymyxins B and E, and they will facilitate the generation of novel polymyxin derivatives.
authors.affiliation: Super-Bacteria Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Republic of Korea.|Department of Bioscience and Bioengineering, Korea University of Science and Technology (UST), Daejeon 305-350, Republic of Korea.
authors.forename: Se-Yu
authors.initials: SY
authors.lastname: Kim
authors.affiliation: Super-Bacteria Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Republic of Korea.
authors.forename: Soo-Young
authors.initials: SY
authors.lastname: Park
authors.affiliation: Super-Bacteria Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Republic of Korea.|Department of Bioscience and Bioengineering, Korea University of Science and Technology (UST), Daejeon 305-350, Republic of Korea.
authors.forename: Soo-Keun
authors.initials: SK
authors.lastname: Choi
authors.affiliation: Super-Bacteria Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Republic of Korea.|Department of Bioscience and Bioengineering, Korea University of Science and Technology (UST), Daejeon 305-350, Republic of Korea.
authors.forename: Seung-Hwan
authors.initials: SH
authors.lastname: Park
mesh_terms: D001412:Bacillus subtilis / Q000235:genetics / Q000378:metabolism*; D008025:Ligases / Q000235:genetics / Q000378:metabolism*; D060847:Metabolic Engineering; D056507:Paenibacillus / Q000201:enzymology* / Q000235:genetics; D011113:Polymyxins / Q000096:biosynthesis*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D011113:Polymyxins; D011994:Recombinant Proteins; D008025:Ligases
keywords: A-domain engineering; Bacillus subtilis; heterologous expression; polymyxin B; polymyxin E; polymyxin synthetase