Influence of specific growth rate on specific productivity and glycosylation of a recombinant avidin produced by a Pichia pastoris Mut+ strain
✍ Scribed by Jonas Schenk; Krisztina Balazs; Carmen Jungo; Julien Urfer; Carole Wegmann; Andrea Zocchi; Ian W. Marison; Urs von Stockar
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 195 KB
- Volume
- 99
- Category
- Article
- ISSN
- 0006-3592
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✦ Synopsis
Abstract
A recombinant avidin‐producing Mut^+^ Pichia pastoris strain was used as a model organism to study the influence of the methanol feeding strategy on the specific product productivity (q~p~) and protein glycosylation. Fed‐batch cultivations performed at various specific growth rates (µ) and residual methanol concentrations showed that the specific avidin productivity is growth‐dependent. The specific productivity increases strongly with the specific growth rate for µ ranging from 0 to 0.02 h^−1^, and increases only slightly with the specific growth rate above this limit. N‐terminal glycosylation was also found to be influenced by the specific growth rate, since 9‐mannose glycans were the most abundant form at low growth rates, whereas 10‐mannose carbohydrate chains were favored at higher µ. These results show that culture parameters, such as the specific growth rate, may significantly affect the activity of glycoproteins produced in Pichia pastoris. In terms of process optimization, this suggests that a compromise on the specific growth rate may have to be found, in certain cases, to work with an acceptable productivity while avoiding the addition of many mannoses. Biotechnol. Bioeng. 2008;99: 368–377. © 2007 Wiley Periodicals, Inc.