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Abstract ▼ AI-Helper

A cDNA clone for human interleukin-2(IL-2) has been isolated (Kang et al., 1987). Plasmid pNK2 was constructed in order to obtain the expression of IL-2 in E. coli. In plasmid pNK2, the coding sequence was placed under the control of phage ${\lambda}$ promoter $P_L$. An E. coli...

A cDNA clone for human interleukin-2(IL-2) has been isolated (Kang et al., 1987). Plasmid pNK2 was constructed in order to obtain the expression of IL-2 in E. coli. In plasmid pNK2, the coding sequence was placed under the control of phage ${\lambda}$ promoter $P_L$. An E. coli ${\lambda}$ lysogenic strain carrying a temperature sensitive repressor (${\lambda}$ cIts857) was transformed with pNK2 and the expression of IL-2 cDNA was induced by raising the temperature to $42^{\circ}C$. The inclusion bodies were observed in recombinant E. coli cells after induction. When the proteins of the recombinant cells were separated on a SDS-polyacrylamide gel, a 15Kd protein band corresponding to the M.W. of IL-2 was observed. The 15Kd protein showed IL-2 activity as determined by the growth romoting effect on a IL-2 dependent cell line MTL. Therefore, it was demonstrated that the 15Kd protein was recombinant IL-2 produced in E. coli. The recombinant IL-2 represented about 20% of the total E. coli protein.