期刊
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
卷 47, 期 12, 页码 1161-1172出版社
OXFORD UNIV PRESS
DOI: 10.1007/s10295-020-02311-6
关键词
Phytase; Heterologous expression; Secretion; Pichia pastoris
资金
- National Key R&D Program of China [2018YFD0901001]
- Tianjin Science Fund for Distinguished Young Scholars [17JCJQJC45300]
Phytase is an additive in animal feed that degrades phytic acid in plant material, reducing feeding costs, and pollution from fecal phosphorus excretion. A multistrategy approach was adopted to improve the expression ofE. coliphytase inPichia pastoris. We determined that the most suitable signal peptide for phytase secretion was an alpha-factor secretion signal with an initial enzyme activity of 153.51 U/mL. Increasing the copy number of this gene to four increased phytase enzyme activity by 234.35%. PDI overexpression and Pep4 gene knockout increased extracellular phytase production by 35.33% and 26.64%, respectively. By combining favorable factors affecting phytase expression and secretion, the enzyme activity of the phytase-engineered strain was amplified 384.60% compared with that of the original strain. We also evaluated the potential for the industrial production of the engineered strain using a 50-L fed-batch fermenter and achieved a total activity of 30,246 U/mL after 180 h of fermentation.
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