title: Nutrition and bioprocess development for efficient biosynthesis of an antitumor compound from marine-derived fungus.
abstract: An integrated nutrition and bioprocess strategy was developed for improving the biosynthesis of an antitumor compound, 1403C, by a marine-derived fungus, Halorosellinia sp. (no. 1403). First, statistical design strategies were synthetically applied to optimize the nutritional composition. The resulting 1403C production reached 2.07 g/l, which was 143.5 % higher than the original production. However, it only produced 0.44 g/l of 1403C in 5-l bioreactor fermentation. Thus, the operating parameters including culture pH, dissolved oxygen, agitation speed, impeller type and inoculum level were considered to improve the fermentation process, and an effective control strategy for 1403C production by Halorosellinia sp. submerged in a 5-l bioreactor was established. When inoculating 0.22 g/l dry biomass, controlling dissolved oxygen not lower than 30 % during the growth phase but ranging between 30 and 40 % during the stationary phase, using a double-layer six-flat-blade Rushton disc turbine agitated at 400 rpm, keeping short-term low pH and rapid-rising pH with glucose starvation, the highest 1403C production was finally obtained at 1.32 g/l, which was promoted by 200 % compared to before optimization. Fermentation scale-up was finally performed in a 500-l bioreactor, and 1403C production of 1.09 g/l was obtained.
authors.affiliation: State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
authors.forename: Weiqiang
authors.initials: W
authors.lastname: Zhou
authors.forename: Menghao
authors.initials: M
authors.lastname: Cai
authors.forename: Jiushun
authors.initials: J
authors.lastname: Zhou
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.forename: Jiao
authors.initials: J
authors.lastname: Zhou
authors.forename: Meixia
authors.initials: M
authors.lastname: Wang
authors.forename: Xiangshan
authors.initials: X
authors.lastname: Zhou
authors.forename: Yuanxing
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000880:Anthraquinones / Q000378:metabolism*; D000970:Antineoplastic Agents / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D005285:Fermentation; D005947:Glucose / Q000032:analysis / Q000378:metabolism; D007218:Industrial Microbiology / Q000295:instrumentation / Q000379:methods*; D010100:Oxygen / Q000032:analysis / Q000378:metabolism; D012623:Seawater / Q000382:microbiology; D013098:Xylariales / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D000880:Anthraquinones; D000970:Antineoplastic Agents; D003470:Culture Media; C569938:SZ 685C; D005947:Glucose; D010100:Oxygen