title: Extractive fermentation for enhanced production of thailandepsin A from Burkholderia thailandensis E264 using polyaromatic adsorbent resin Diaion HP-20.
abstract: Thailandepsin A is natural product of Burkholderia thailandensis E264 with potent histone deacetylase inhibitory activities and promising anticancer activities. The titer of thailandepsin A is very low (less than 10 mg/l) from limited empirical fermentation. To facilitate preclinical evaluations and potentially clinical development of thailandepsin A, systematic optimization and extractive fermentation of thailandepsin A from B. thailandensis E264 culture in flasks were investigated in this pilot study. The main fermentation parameters--28°C, pH 7.0, inoculum ratio 1% (v/v), incubation duration 60 h, medium volume 26%, shaking speed 170 rpm, and chloroform as extracting solvent--were determined by single factor experiments. Polyaromatic adsorbent resin Diaion HP-20, when added at a concentration of 4% (w/v), was most effective to reduce feedback inhibition of thailandepsin A and to significantly increase the titer of target product. Central composite design was used to further optimize the fermentation medium for B. thailandensis E264. The optimized medium contains glucose 17.89 g/l, tryptone 34.98 g/l, potassium phosphate 24.84 g/l, and sodium citrate 0.01 g/l, which resulted in a large increase of the titer of thailandepsin A to 236.7 mg/l. Finally kinetic models based on the modified logistic and Luedeking-Piret equations were developed, delivering a good description of temporal variations of biomass, product, and substrate in the fermentation process, which could be used as references for developing large-scale fermentation.
authors.affiliation: State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
authors.forename: Bing
authors.initials: B
authors.lastname: Liu
authors.forename: Junyuan
authors.initials: J
authors.lastname: Hui
authors.forename: Yi-Qiang
authors.initials: YQ
authors.lastname: Cheng
authors.forename: Xuehong
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry / Q000378:metabolism*; D018533:Biomass; D019117:Burkholderia / Q000378:metabolism*; D047630:Depsipeptides / Q000096:biosynthesis* / Q000737:chemistry; D005285:Fermentation; D056572:Histone Deacetylase Inhibitors / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D010865:Pilot Projects; D011137:Polystyrenes
chemical_list: D000970:Antineoplastic Agents; D047630:Depsipeptides; D056572:Histone Deacetylase Inhibitors; D011137:Polystyrenes; C574693:thailandepsin A; C065649:Diaion HP 20