Expression and purification of an antitumor-analgesic peptide from the venom of Mesobuthus martensii Karsch by small ubiquitin–related modifier fusion in Escherichia coli

Authors

  • Peng Cao,

    Corresponding author
    1. Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
    • Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
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  • Jiemiao Yu,

    1. Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
    2. School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
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  • Wuguang Lu,

    1. Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
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  • Xueting Cai,

    1. Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
    2. School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
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  • Zhigang Wang,

    1. Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
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  • Zhenhua Gu,

    1. Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
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  • Juan Zhang,

    1. School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
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  • Tingmei Ye,

    1. Laboratory of Cellular and Molecular Biology, Jiangsu Province Institute of Traditional Chinese Medicine, Nanjing 210028, China
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  • Min Wang

    Corresponding author
    1. School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
    • School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
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Abstract

To prevent protein aggregation, some proteins are usually expressed as fusion proteins from which target proteins can be released by proteolytic or chemical reagents. In this report, small ubiquitin-related modifier (SUMO) linked with a hexa-histidine tag was used as a fusion partner for the antitumor-analgesic peptide from the venom of Buthus martensii (Karsch) scorpion (AGAP). The optimal expression level of the soluble fusion protein, SUMO-AGAP, was up to 40% of the total cellular protein. The fusion protein was purified by Ni-NTA affinity chromatography and cleaved by a SUMO-specific protease (Ulp1) to obtain the recombinant AGAP (rAGAP), which was further purified by Ni-NTA affinity chromatography. The purified final product was >95% pure by SDS-PAGE stained with Coomassie brilliant blue R-250. Mass spectroscopic analysis indicated the protein to be 7142.63 Dalton, which equaled the theoretically expected mass. N-terminal sequencing of rAGAP showed the sequence corresponded to the native protein. MTT assay indicated the rAGAP could significantly inhibit the proliferation of Jurkat and Hut 78 T lymphoma cell lines. The further writhing experiment showed that the rAGAP had an intensive analgesic effect. The expression strategy presented in this study allows convenient high yield and easy purification of the rAGAP with native sequences. © 2010 American Institute of Chemical Engineers Biotechnol. Prog., 2010

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