High-level expression of human interferon gamma in Escherichia coli under control of the pL promoter of bacteriophage lambda.
Several recombinant plasmids have been constructed which direct high-level synthesis of mature human interferon gamma (IFN-gamma) in Escherichia coli using the inducible leftward promoter pL of phage lambda followed by a translational initiator region derived either from the phage MS2 replicase gene or the E. coli tryptophan attenuator region. Under these conditions, IFN levels of up to 25% of the total cellular protein can be achieved. The highest levels were obtained when a terminator of transcription was cloned downstream from the IFN-gamma sequence. IFN-gamma was almost entirely found in the initial pellet fraction and not in soluble extracts. Co-induction of the lysis genes derived from phage MS2 or from phage lambda, inserted downstream from the IFN-gamma sequence, did not enhance the biological activity present in the supernatant fraction.
D010582:Bacteriophage lambda / Q000235:genetics*; D003001:Cloning, Molecular; D004274:DNA, Recombinant / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism*; D005786:Gene Expression Regulation; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000235:genetics; D009876:Operon; D010442:Peptide Chain Initiation, Translational
D004274:DNA, Recombinant; D007371:Interferon-gamma