Enhancing the Heterologous Expression of a Thermophilic Endoglucanase and Its Cost-Effective Production in Pichia pastoris Using Multiple Strategies

被引:3
|
作者
Dai, Wuling [1 ]
Dong, Haofan [2 ]
Zhang, Zhaokun [2 ]
Wu, Xin [2 ]
Bao, Tongtong [2 ]
Gao, Le [2 ]
Chen, Xiaoyi [1 ]
机构
[1] Dalian Polytech Univ, Sch Biol Engn, Dalian 116034, Peoples R China
[2] Chinese Acad Sci, Natl Technol Innovat Ctr Synthet Biol, Tianjin Inst Ind Biotechnol, Tianjin 300308, Peoples R China
关键词
thermophilic endoglucanase; multifactorial regulation strategy; cost-effective production; single-cell protein; CRYSTAL-STRUCTURE; PROTEIN;
D O I
10.3390/ijms241915017
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Although Pichia pastoris was successfully used for heterologous gene expression for more than twenty years, many factors influencing protein expression remain unclear. Here, we optimized the expression of a thermophilic endoglucanase from Thermothielavioides terrestris (TtCel45A) for cost-effective production in Pichia pastoris. To achieve this, we established a multifactorial regulation strategy that involved selecting a genome-editing system, utilizing neutral loci, incorporating multiple copies of the heterologous expression cassette, and optimizing high-density fermentation for the co-production of single-cell protein (SCP). Notably, even though all neutral sites were used, there was still a slight difference in the enzymatic activity of heterologously expressed TtCel45A. Interestingly, the optimal gene copy number for the chromosomal expression of TtCel45A was found to be three, indicating limitations in translational capacity, post-translational processing, and secretion, ultimately impacting protein yields in P. pastoris. We suggest that multiple parameters might influence a kinetic competition between protein elongation and mRNA degradation. During high-density fermentation, the highest protein concentration and endoglucanase activity of TtCel45A with three copies reached 15.8 g/L and 9640 IU/mL, respectively. At the same time, the remaining SCP of P. pastoris exhibited a crude protein and amino acid content of up to 59.32% and 46.98%, respectively. These findings suggested that SCP from P. pastoris holds great promise as a sustainable and cost-effective alternative for meeting the global protein demand, while also enabling the production of thermophilic TtCel45A in a single industrial process.
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页数:11
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