A stable vector for high-level expression and secretion of human interferon alpha A in yeast.
Yeast high stable plasmid vector pHC11 was constructed by introducing pEM-BL Yi27 cleaved with SmaI into the SnaBI site of intact 2 microns plasmid. The result of plasmid stability assay revealed that 82% of the host cells still harbored the vector after 50-generations growth in non-selective medium, which confirmed the existence of a non-functional region in 2 microns plasmid. The human interferon alpha A (IFN alpha A) gene expression-secretion cassette was inserted into pHC11, and the yeast transformant was cultured in complex medium. The data showed that the expressed product was 36.8% of the total protein amount in the culture supernatant and the IFN alpha A biological activity was 2.6 x 10(10) units per liter, demonstrating that high-level expression and secretion of IFN alpha A were achieved in yeast by using the stable vector pHC11.
Institute of Genetics, Fudan University, Shanghai, PRC.
K K
KK
Huo
L L
LL
Yu
X J
XJ
Chen
Y Y
YY
Li
D004926:Escherichia coli / Q000235:genetics; D015870:Gene Expression; D005822:Genetic Vectors; D007370:Interferon Type I / Q000235:genetics* / Q000378:metabolism; D010957:Plasmids; D011994:Recombinant Proteins; D012441:Saccharomyces cerevisiae / Q000235:genetics*
D007370:Interferon Type I; D011994:Recombinant Proteins