Abstract
A high-density cell culture method to produce human angiostatin has been successfully established by constitutive expression of the protein in Pichia pastoris. The fermentation was carried out in a 20 l bioreactor with a 10 l working volume, using a high-density cell culture method by continuously feeding with 50% glycerol−0.8% PTM4 to the growing culture for 60 h at 30°C. Dissolved oxygen level was maintained at 25–30% and pH was controlled at 5 by the addition of 7 M NH4OH. Angiostatin was constitutively expressed during the fermentation by linking its expression to the P. pastoris constitutive GAP promoter (pGAP). But after 36 h of fermentation, the peak biomass growth was 305 as measured by absorption of 600 nm, while the peak angiostatin expression was 176 mg/l. Similar to the product expressed from inducible system [24], angiostatin produced from constitutive system also inhibited the angiogenesis on the CAM and suppressed the growth of B16 melanoma in C57BL/6J mouse. The above results suggest that GAP promoter is more efficient than AOX1 promoter for the expression of angiostatin in P. pastoris by shake flask culture or high-density cell fermentation and is likely to be an alternative to AOX1 promoter in large-scale expression of angiostatin and other heterologous proteins.
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Supported by the Natural Science Foundation of China (39670013) and “225” Science and Technology Program of Guangzhou Municipal Government of China (99-Z-004-001).
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Zhang, A.L., Zhang, T.Y., Luo, J.X. et al. Constitutive expression of human angiostatin in Pichia pastoris by high-density cell culture. J Ind Microbiol Biotechnol 34, 117–122 (2007). https://doi.org/10.1007/s10295-006-0175-3
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DOI: https://doi.org/10.1007/s10295-006-0175-3