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Construction and Determination of an Episomal Secreting Expression Vector:pYES2/CT/α-factor for Saccharomyces cerevisiae |
HU Ya-dong1,2,YAO Dong-sheng2 |
1.Guangzhou Co-win Bioengineering Co.,Ltd.,Guangzhou 510600,China
2.Institute of Microbial Technology,Jinan University,Guangzhou 510632,China |
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Abstract pPIC9 was used as a template and α-factor gene of Saccharomyces cerevisiae was amplified by PCR.The gene was cloned in the intracellular expression vector pYES2/CT for Saccharomyces cerevisiae and the secreting expression vector named pYES2/CT/α-factor(pYCα)was constructed.The gene of mannase(man)from recombinant vector of pKLAC1-man(pKLman)was cut by restriction enzymes and linked with pYCα.This recombinant vector pYCα-man was used to determine the secretory ability and stability of pYCα.The excellent secretory ability of pYCα was proved by two experiments.One showed that INVSc1/pYCα-man clones formed the clear rings around the clones on the medium contained trypan blue,while INVSc1/pYCα clones had no rings.Further analysis of mannase activity of extracellular supernatant and intracellular extracts showed that both extracellular and intracellular mannase activities of INVSc1/pYCα were not detected,while INVSc1/pYCα-man had evident extracellular mannase activities and no intracellular mannase activities.The stability of pYCα was also very good proved by continuous cultivation for about 150h.
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Received: 13 August 2009
Published: 21 December 2009
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