title: Efficient expression in Escherichia coli of a mature and a modified human interferon-beta 1.
abstract: Ten recombinant plasmids were constructed which direct the synthesis of a mature human interferon-beta 1 (IFN-beta 1) under the control of the Escherichia coli tryptophan (trp) promoter. The spacing between the Shine-Dalgarno sequence of the trpL and the ATG initiation codon of the interferon gene was varied from 6 to 23 nucleotides by utilizing a Cla I site located within the spacer region of the plasmids. The optimal spacing for expression of IFN-beta 1 was determined to be 8-13 nucleotides from the results of interferon assay. The E. coli lipoprotein (lpp) promoter was also used for expression of IFN-beta 1 in E. coli. The results with an expression vector carrying a lpp-lac promoter showed that a modified IFN-beta 1 containing an additional 7 amino acids at the amino-terminus might be less active than the mature molecule.
mesh_terms: D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D005786:Gene Expression Regulation; D005796:Genes; D006801:Humans; D007370:Interferon Type I / Q000096:biosynthesis / Q000235:genetics*; D009876:Operon; D010957:Plasmids
chemical_list: D007370:Interferon Type I