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The gene of human interleukin-6 (hIL-6) with an additional 20 amino acids on the N-end, including six histidine residues, was cloned into the expression plasmid pET28b(+). The conditions were elaborated for preparing highly active protein both using denaturing agents and without them. Application of a dialysis cascade allowed us to prepare a functionally active hIL-6 of 90-95% purity with the yield of 3 mg from liter of the cell culture. The highest activity was detected by ELISA in the preparation obtained without denaturing agents. The functional activity of hIL-6 was studied by flow cytofluorimetry. Addition of hIL-6 to the cells of immortal lines of human multiple myeloma resulted in dimerization of the gp130 receptor molecule.
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