Streptomyces lividans 66 was transformed with a plasmid containing the regulatory region of the Streptomyces fradiae aph gene and a structural gene that specifies bovine growth hormone (bGH). When grown in liquid culture the transformant contained a protein identical to authentic bGH, as judged by radioimmunoassay and immuno-blotting (Western analysis). The bGH was present in cells that had been in culture for up to four weeks but was not found in the medium. The strategy employed should be generally applicable to the expression of foreign genes in actinomycetes. © 1984.
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