Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Overexpression of the SPP2 gene of saccharomyces cerevisiae and production of antibodiesd to Spp2p

  • Park, Kwang-Hark (Department of Biology, Kangwon University) ;
  • Lea, Ho-Zoo (Department of Biology, Kangwon University) ;
  • L. Woolford (Department of Biological Sciences, Carnegie-Mellon University) ;
  • Kim, Kyung-Hoon (Department of Biology, Kangwon University)
  • Published : 1995.09.01
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Abstract

We have previously reported that SPP2 gene product of yeast Saccharomyces cerevisiae is involved in the pre-mRNA splicing. To investigate the rol ein the splicing pathway of the Spp2p protein, the SPP2 gene was overexpressed in Escherichia coli and polyclonal antibodies to Spp2p were generated from rabbits. First, a DNA fragment containing the SPP2 GENE without its promoter was subcloned into an E. coli expression vector, pKK233-3. The resulting recombinant plasmid pBQ14 contained an IPTG inducible tac promoter and the SPP2 structural gene. Overexpression of the SPP2 gene was achieved by additionof 0.1 to 1.0 mM IPTG to a logarithmic culture of E. coli JM103(pBQ14) for 90 min at 37.deg.C. Sequence of N-terminal 15 amino acids of the overproduced protein was well matched to the deduced one from the SPP2 reading frame. Then, polyclonal antibodies were generated from rabbits immunized with gel-purified SppSp protein. These antibodies reacted specifically with the Spp2p protein extracted from yeast cells expressing the SPP2 gene to a great extent. The antibodies could also block the activity of yeast splicing extracts.

Keywords

References

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