Abstract
To evaluate the clinic safety of human Midkine as an articular protective agent, recombinant mouse Midkine (rmMK) was prepared in prokaryotic system for the pre-clinic long-term studies in mice. The open reading frame of mouse Midkine (mMK) was sub-cloned onto expression vector pET30a (+) and transformed into Escherichia coli BL21 (DE3) strain line. The rmMK protein, with a Met fused at N terminus of native mMK for expression initiating, proved to be expressed in inclusion bodies and turned out to be soluble post-denaturation and renaturation. The soluble rmMK was purified successfully with ion exchange and affinity chromatography and characterised good enough to meet the requirements for animal use. Eventually, 13.2-mg rmMK with high quality and bioactivity was obtained from 1 L LB culture, and the total recovery was 11.4 %. The present work laid a good foundation for pilot- or large-scale production of rmMK in prokaryotic system.
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Acknowledgements
Financial support for this work was provided by National Science Foundation of China (Grant No. 81173113 and No. 81273573), Shanghai Science Foundation (Grant No. 11431921300) and National Post-doctor Foundation of China (Grant No. 2012 M520902).
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The authors declare that there exist no competing financial or other interests.
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Gao, J., Wang, H. Prokaryotic Expression, Refolding and Purification of High-Purity Mouse Midkine in Escherichia coli . Appl Biochem Biotechnol 176, 454–466 (2015). https://doi.org/10.1007/s12010-015-1587-1
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DOI: https://doi.org/10.1007/s12010-015-1587-1