Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Single-Step Purification of Proteins of Interest from Proteolytically Cleaved Recombinant Maltose-binding Protein (MBP) Fusion Proteins by Selective Immunoprecipitation of MBP

  • Park, Jung-Hyun (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology, Taejon) ;
  • Na, Shin-Young (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology, Taejon) ;
  • Lee, Dong-Gun (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology, Taejon) ;
  • Han, Byoung-Don (Hanil Pharmaceutical Industry Co., Ltd.) ;
  • Kim, Kil-Lyong (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology, Taejon)
  • Published : 1998.12.01
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Abstract

The maltose binding protein (MBP) fusion protein system is a versatile tool to express and isolate recombinant proteins in E. coli. In this system, MBP fusion proteins are efficiently isolated from whole cell lysate using amylose conjugated agarose beads and then eluted by competition with free maltose. Since MBP is a rather large molecule (∼42 kDa), for further experiments, the MBP part is usually proteolytically cleaved from the fusion protein and subsequently removed by ion-exchange chromatography or rebinding to amylose columns after washing out excess and MBP-bound maltose. In the present study, we have developed an improved method for the removal of cleaved MBP, which is advantageous over conventional methods. In this method, factor Xa cleaved MBP fusion proteins were incubated with Sepharose beads conjugated with MBP specific monoclonal antibodies and then precipitated buy centrifugation, resulting in highly purified proteins in the supernatant.

Keywords

References

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