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DNA FRAGMENT CARRYING FUNCTION TO PROMOTE EXTRACELLULAR SECRETION, PLASMID HAVING THE SAME AND ESCHERICHIA COLI TRANSFORMED THEREWITH
DNA FRAGMENT CARRYING FUNCTION TO PROMOTE EXTRACELLULAR SECRETION, PLASMID HAVING THE SAME AND ESCHERICHIA COLI TRANSFORMED THEREWITH
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机译:DNA片段具有促进细胞外分泌的功能,质粒具有相同的功能,从而转化了大肠杆菌
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摘要
PURPOSE:To enable continuous obtaining of a useful physiologically active protein by carrying out transformation with a plasmid having a specific DNA fragment. CONSTITUTION:Synthesis is performed with a DNA synthesizer to provide a DNA fragment (A) having function to code an amino acid sequence expressed by formula I and impart the character for promoting extracellular secretion of a useful physiologically active protein to Escherichia coli. The resultant ingredient (A) is then introduced into a plasmid to afford a plasmid vector (B) such as pUC119. The obtained ingredient (B) is subsequently introduced into Escherichia coli to afford Escherichia.coli HB101 (pAK191) strain (C) which is a transformant. The resultant strain (C) is then cultured in a culture medium containing bactotrypton, etc., at about 37 deg.C to produce the useful physiologically active protein such as beta-galactosidase.
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