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Production of soluble bioactive mouse leukemia inhibitory factor from Escherichia coli using MBP tag.

Embryonic stem cells and induced pluripotent stem cells depend on one of cytokines called leukemia inhibitory factor (LIF) to retain their undifferentiated state and pluripotency. Nevertheless, further progresses of stem cell scientific investigation and its possible application are limited owing to the expense of commercial LIF. Here we introduced a simple, practical and high level expression of MBP-mouse LIF through Escherichia coli system which was bioactive. The mLIF cDNA was inserted into vector of pMAL-C2X in order to generate N-terminal MBP-mLIF recombinant proteins in the cytoplasm of Escherichia coli. MBP-mLIF as a soluble form was expressed. One-step purification through gravitational affinity chromatography was accomplished to acquire high purity (>92%) MBP-mLIF. The MBP-mLIF products specifically suppressed the growth of M1cells in a dose-dependent pattern. MBP-mLIF also was proved the ability to maintain the pluripotency of iPSCs. These outcomes revealed that the N-end MBP tags of the MBP-mLIF did not obstruct mLIF bioactivity. This method to generate recombinant MBP-mLIF is a simple, practical, economical and user-friendly protocol.

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