title: [Optimization and application of chemically defined medium for 13C metabolic flux analysis of Streptomyces rimosus M4018].
abstract: The aim of this study is to develop a synthetic medium suitable for 13C metabolic flux analysis (13C-MFA) of Streptomyces rimosus. The cell growth rate and oxytetracycline production by S. rimosus M4018 were compared when M4018 cells were growth on the optimized chemically defined media with organic nitrogen sources or inorganic nitrogen sources. First, a synthetic medium contained KNO3 as the main nitrogen source was screened, then optimized by a response surface method. Using this new medium, the oxytetracycline yield was increased from 75.2 to 145.6 mg/L. Furthermore, based on the 13C-MFA, we identified that Entner-Doudoroff pathway does not exist in S. rimosus cells cultured in a chemically defined medium with feed of 100% 1-13C labeled glucose. This study is helpful for subsequent 13C-MFA application of S. rimosus.
authors.forename: Long
authors.initials: L
authors.lastname: Wang
authors.forename: Hongtu
authors.initials: H
authors.lastname: Zhao
authors.forename: Lan
authors.initials: L
authors.lastname: Yu
authors.forename: Meijin
authors.initials: M
authors.lastname: Guo
authors.forename: Ju
authors.initials: J
authors.lastname: Chu
authors.forename: Siliang
authors.initials: S
authors.lastname: Zhang
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis; D003470:Culture Media / Q000737:chemistry*; D064688:Metabolic Flux Analysis; D009584:Nitrogen / Q000737:chemistry; D010118:Oxytetracycline / Q000096:biosynthesis*; D064411:Streptomyces rimosus / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D003470:Culture Media; D009584:Nitrogen; D010118:Oxytetracycline