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  • Title: Production of a platelet aggregation inhibitor, salmosin, by high cell density fermentation of recombinant Escherichia coli.
    Author: Seo MJ, Choi HJ, Chung KH, Pyun YR.
    Journal: J Microbiol Biotechnol; 2011 Oct; 21(10):1053-6. PubMed ID: 22031030.
    Abstract:
    Optimal conditions for a high cell density fermentation were investigated in a recombinant Escherichia coli producing salmosin, a platelet aggregation inhibitor. The optimized carbon and nitrogen sources were glycerol 10 g/l, yeast extract 30 g/l, and bacto-tryptone 10 g/l, yielding the dry cell weight (DCW) of 10.61 g/l in a 500 ml flask culture. The late-stage induction with 1% L-arabinose in a 5 l jar fermentor showed the highest DCW of 65.70 g/l after 27 h of the fed-batch fermentation. Around 2,200 mg/l of the protein was expressed as an inclusion body that was then refolded to obtain the active salmosin of 96 mg/l. We also confirmed the inhibitory activity against platelet aggregation of the active salmosin from the high cell density fermentation.
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