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Enhanced porcine circovirus Cap protein production by Pichia pastoris with a fuzzy logic DO control based methanol/sorbitol co-feeding induction strategy

文献类型: 外文期刊

作者: Ding, Jian 2 ; Zhang, Chunling 1 ; Gao, Minjie 2 ; Hou, Guoli 2 ; Liang, Kexue 2 ; Li, Chunhua 1 ; Ni, Jianping 1 ; Li, Z 1 ;

作者机构: 1.Shanghai Acad Agr Sci, Inst Anim Husb & Vet Res, Shanghai 201106, Peoples R China

2.Jiangnan Univ, Sch Biotechnol, Minist Educ, Key Lab Ind Biotechnol, Wuxi 214122, Peoples R China

关键词: Cap protein;DO;Fermentation;Fuzzy control;Metabolic analysis

期刊名称:JOURNAL OF BIOTECHNOLOGY ( 影响因子:3.307; 五年影响因子:3.778 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: Porcine circovirus Cap protein production by P. pastoris with strong AOX promoter suffered with the problems with traditional pure methanol induction: (1) inefficient methanol metabolism; (2) extensive oxygen supply load; (3) difficulty in stable DO control; (4) low protein titer. In this study, based on the difference of DO change patterns in response to methanol and sorbitol additions, a novel fuzzy control system was proposed to automatically regulate the co-feeding rates of methanol and sorbitol for efficient Cap protein induction. With aid of the proposed control system when setting DO control level at 10%, overall fermentation performance was significantly improved: (1) DO could be stably controlled under mild aeration condition; (2) methanol consumption rate could be restricted at moderate level and the major enzymes involved with methanol metabolism were largely activated; (3) Cap protein concentration reached a highest level of 198 mg/L, which was about 64% increase over the best one using the pure methanol induction strategies. (C) 2014 Elsevier B.V. All rights reserved.

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