Abstract
The production of porcine interferon-α (pIFN-α) by Pichia pastoris was largely enhanced when adopting sorbitol/methanol co-feeding induction strategy at 30 °C in a 10-L fermentor. Analysis of energy regeneration pattern and carbon metabolism revealed that major energy metabolism energizing pIFN-α synthesis shifted from formaldehyde dissimilatory energy metabolism pathway to TCA cycle under the methanol/sorbitol co-feeding induction strategy. The sorbitol/methanol co-feeding induction strategy weakened formaldehyde dissimilatory pathway and repressed the accumulation of toxic metabolite-formaldehyde, reduced theoretical oxygen consumption rate and oxygen supply requirement, and increased energy/methanol utilization efficiency so that more methanol could be effectively used for pIFN-α synthesis. As a result, pIFN-α antiviral activity reached a highest level of 1.8 × 107 IU/mL which was about 10- to 200-folds of those obtained under pure methanol induction at 20 and 30 °C, respectively.
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Abbreviations
- AOX:
-
Alcohol oxidase
- CER:
-
CO2 evolution rate
- DCW:
-
Dry cell weight
- FDH:
-
Formate dehydrogenase
- FLD:
-
Formaldehyde dehydrogenase
- HCHO:
-
Formaldehyde
- HCOOH:
-
Formate
- OUR:
-
Oxygen uptake rate
- PDH:
-
Pyruvate dehydrogenase
- pIFN-α:
-
Porcine interferon-α
- IDH:
-
Isocitrate dehydrogenase
- α-KGDHC:
-
α-Ketoglutarate dehydrogenase complex
- η:
-
Energy efficiency
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The authors thank the financial supports from the key agricultural technology program of Shanghai Science & Technology Committee (#073919108) and Major State Basic Research Development Program (#2007CB714303), of China.
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Gao, MJ., Li, Z., Yu, RS. et al. Methanol/sorbitol co-feeding induction enhanced porcine interferon-α production by P. pastoris associated with energy metabolism shift. Bioprocess Biosyst Eng 35, 1125–1136 (2012). https://doi.org/10.1007/s00449-012-0697-1
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DOI: https://doi.org/10.1007/s00449-012-0697-1