Production of insulin-like growth factor-1 in methylotrophic yea

Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Recombinant dna technique included in method of making a...

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435 694, 435 698, 4352555, 4352556, C12N 1518, C12N 119

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active

056121989

ABSTRACT:
Insulin-like growth factor-1 (IGF-1), a naturally occurring, relatively short, single chain polypeptide, is prepared by growing methylotrophic yeast transformants containing in their genome at least one copy of DNA encoding IGF-1, in operational linkage with DNA encoding a signal sequence, which is effective for directing secretion of proteins from the host cells and which also includes the proteolytic processing site lys-arg and may include one or more glu-ala sequences. In preferred embodiments the signal sequence is the S. cerevisiae alpha mating factor pre-pro sequence. Expression of both the DNA encoding IGF-1 and the pre-pro signal sequence is regulated by a promoter region derived from a methanol responsive gene of a methylotrophic yeast. DNA constructs and recombinant methylotrophic yeast strains used for the expression and secretion of IGF-1 are also provided. For preferred embodiments, protease deficient Pichia pastoris strains are provided.

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