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- W2068391719 abstract "Human cystatin C is a cysteine proteinase inhibitor with potential applications as an anti-viral agent, cancer tumor growth inhibitor, and in prevention of proteolysis during food processing. A glycosylated cystatin C mutant with increased temperature stability was developed for the latter application [Nakamura et al. (1998) FEBS Lett 427:252–254]. A recombinant variant of cystatin C [Nakamura et al. (2000) International patent no. PLTCA99/00717] with two potential sites for N-linked glycosylation was expressed in Pichia pastoris Muts . Little of the cystatin C produced was in the glycosylated form under fermentation conditions of pH 6, temperature 28°C, methanol only feed, and ammonium hydroxide as a nitrogen source. Thus, the effect of addition of complex nitrogen sources, peptone and amino acid supplements, on the yield and glycosylation of this mutant cystatin C were investigated. A full factorial design experiment using 2-l fermenters was performed with three factors: ammonium hydroxide, peptone, and an amino acid mix, at two levels, absent or present. Peptone addition was found to have a positive, and the most significant, effect on cell specific cystatin C yield. A maximum mutant cystatin C yield of 0.82 μmol (g-dry cell weight)−1 min−1 was obtained when all three nitrogen sources were used together. However, under these conditions only 16% of protein was in the glycosylated form since ammonia was found to have a significant negative effect on glycosylation extent. The maximum extent of glycosylation was 30% when peptone and amino acid mix were the only nitrogen sources added." @default.
- W2068391719 created "2016-06-24" @default.
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- W2068391719 date "2004-11-18" @default.
- W2068391719 modified "2023-09-23" @default.
- W2068391719 title "The effect of nitrogen source on yield and glycosylation of a human cystatin C mutant expressed in Pichia pastoris" @default.
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- W2068391719 doi "https://doi.org/10.1007/s10295-004-0181-2" @default.
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