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Updated: Aug 24, 2026
Expression of Recombinant Proteins in the Methylotrophic Yeast Pichia pastoris
Published on: February 25, 2010
[Expression of Japanese encephalitis virus E protein in methylotrophic yeast Pichia pastoris]
Yu-Shui Wu1, Jun-Ping Ren, Qing-Sheng Huang
1Department of Microbiology, Fourth Military Medical University, Xi'an 710032,China.
Aim:
To express Japanese encephalitis virus (JEV) E protein in methylotrophic yeast Pichia pastoris.
Methods:
The gene coding for JEV E protein was sub-cloned into vector pPIC9k. The constructed plasmid was transformed into yeast SMD1168 by electroporation. The recombinant transformants with a high copy number of the plasmid were selected by using MD plate and G418. The expression of E protein in yeast was induced by the addition of methanol and analyzed by SDS-PAGE and Western blot.
Results:
The protein was produced at a yield of 50 mg per litre of culture. Owing to heterogeneous glycosylation, relative molecular mass (M(r)) of the expressed E protein was sized about 113 000 and 78 000.
Conclusion:
JEV E protein was expressed successfully in yeast Pichia pastoris, which should be useful for the production of diagnostic reagents and genetically engineered vaccine of JEV.
