Process for selectively hydrolising fusion proteins

摘要

Polypeptides or proteins such as, for example, insulins or de-B<3><0>-insulins - especially human insulin or de-B<3><0>-human insulin - are prepared by enzymatic cleavage, using a trypsin-like endopeptidase, of specific fusion proteins which can be obtained by genetic manipulation and which contain the residue of a peptide-like alpha -amylase inhibitor in the molecule. The use of the specific fusion proteins results in a reaction product which can be worked up advantageously; the working-up can take place, where appropriate, by crystallisation.