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. 1980 Dec 20;8(24):6163–6174. doi: 10.1093/nar/8.24.6163

Leu-enkephalin purification from E. coli cells carrying the plasmid with fused synthetic leu-enkephalin gene

MF Shemyakin 1, AV Chestukhin 1, GM Dolganov 1, EM Khodkova 1, GS Monastyrskaya 1, ED Sverdlov 1
PMCID: PMC328079  PMID: 7008033

Abstract

Chemically synthesized leu-enkephalin gene was fused to a large Eco RI-Bam HI fragment of pBR322 along with a Eco RI fragment of Ch4A phage DNA carrying the promoter and most of the E.coli β-galactosidase gene. The resulting recombinant DNA was used to transform E. coli cells. Transformants were screened for Tc-sensitivity, Am-resistance, and β-galactosidase constitutional synthesis. Restriction endonuclease analysis combined with DNA sequencing of the plasmid DNAs revealed a complete nucleotide leu-enkephalin sequence and Eco RI lac-operon fragment in two possible orientations. Radioimmunoassay for leu-enkephalin activity in BrCN-treated bacterial extracts showed that in vivo leu-enkephalin is synthesized only in strains carrying plasmids with the proper lac-fragment orientation. About 5·104 molecules of the former are synthesized per single E. coli cell. One of the clones was used for leu-enkephalin purification. Using 100 g of cells it is possible to obtain about 2 mg of practically pure leu-enkephalin.

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Selected References

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