title: Enhancement of pradimicin production in Actinomadura hibisca P157-2 by metabolic engineering.
abstract: Actinomadura hibisca P157-2 produces potent antifungal antibiotic pradimicins. To enhance pradimicin production, ACCase from Streptomyces coelicolor and two regulatory genes metK1-sp and afsR-sp from Streptomyces peuticus were overexpressed into A. hibisca using an integration vector pSET152 under the control of the strong ermE* promoter. The constructed plasmids pACC152, pSAM152, pAFS152, pSA152 and pASA152 were transformed into A. hibisca by the conjugal method. The recombinant strains A. hibisca ACC, A. hibisca SAM, A. hibisca AFS, A. hibisca SA and A. hibisca ASA produced greater amounts of pradimicin than the parental strain with an increment of 3-fold, 2.1-fold, 2.8-fold, 3.4-fold, and 4.5-fold respectively. To increase the acetyl-coA pool, the strains were fed methyl oleate and acetate as carbon sources. The production was increased in wild-type A. hibisca, A. hibisca ACC and A. hibisca ASA by 2.2-fold, 4.12-fold and 5.98-fold respectively, with oleate and by 1.12-fold, 3.8-fold and 5.38-fold respectively with acetate. The strain A. hibisca ASA remained the best strain for the production of pradimicin. The higher transcriptional levels of structural genes in the strains harboring metK1-sp and afsR-sp compared to the wild-type strain were consistent with the enhanced production.
authors.affiliation: Institute of Biomolecule Reconstruction, Department of Pharmaceutical Engineering, Sun Moon University, # 100 Kalsan-ri, Tangjeong-myeon, Asan, Chungnam, Republic of Korea.
authors.forename: Sarita
authors.initials: S
authors.lastname: Paudel
authors.forename: Hei Chan
authors.initials: HC
authors.lastname: Lee
authors.forename: Beom Seok
authors.initials: BS
authors.lastname: Kim
authors.forename: Jae Kyung
authors.initials: JK
authors.lastname: Sohng
mesh_terms: D000192:Actinomycetales / Q000235:genetics* / Q000378:metabolism*; D018943:Anthracyclines / Q000378:metabolism*; D000935:Antifungal Agents / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D060847:Metabolic Engineering; D013302:Streptomyces / Q000235:genetics
chemical_list: D018943:Anthracyclines; D000935:Antifungal Agents; D001426:Bacterial Proteins