Abstract
We have found a direct relationship between protein production in Pichia pastoris and the number of introduced synthetic genes of miniproinsulin (MPI), fused to the Saccharomyces cerevisiae pre-pro alpha factor used as secretion signal, and inserted between the alcohol oxidase 1 (AOX1) promoter and terminator sequences. Two consecutive approaches were followed to increase the number of integrated cassettes: the head-to-tail expression cassette multimerization procedure and re-transformation with a dominant selection marker. This increased expression from 19 to 250 mg l−1 when about 11 copies have been integrated. Further, the correct position of one of the disulphide bridges of the purified molecule was verified by digestion with Glu-C endoprotease, followed by mass spectrometry of the isolated fragments.
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Mansur, M., Cabello, C., Hernández, L. et al. Multiple gene copy number enhances insulin precursor secretion in the yeast Pichia pastoris . Biotechnol Lett 27, 339–345 (2005). https://doi.org/10.1007/s10529-005-1007-7
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DOI: https://doi.org/10.1007/s10529-005-1007-7