Secretory Expression of Porcine Insulin Precursor in Kluyveromyces lactis and Its Conversion into Human Insulin.
Porcine insulin precursor (PIP) was cloned to vectors derived from plasmid pKD1 and expressed in Kluyveromyces lactis. The secretory expression level of PIP was 20 to 30 mg per liter of the culture medium. Human insulin obtained from PIP through tryptic transpeptidation was characterized. Its amino acid composition, crystalline shape and biological activity are identical with those of native insulin.