Abstract

During comparison of microcarrier and suspension cultures with recombinant BHK cells a specific proteolytic activity appeared only when the cells grew in suspension. The protease was detected by its specificity in cleaving the recombinant product into smaller peptides. Approximately one-third of the total amount of the product was inactivated as estimated by Western-blot analysis. No proteolytic activity was recognized when using an anchorage dependent state of growth which was investigated by several fermentations with different microcarrier types.

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