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. 1983 Nov 25;11(22):8019–8030. doi: 10.1093/nar/11.22.8019

An improved positive selection plasmid vector constructed by oligonucleotide mediated mutagenesis.

B Nilsson, M Uhlén, S Josephson, S Gatenbeck, L Philipson
PMCID: PMC326556  PMID: 6316281

Abstract

An Escherichia coli plasmid vector, pUN121, has been constructed which allows for positive selection of transformants harboring DNA inserts. The positive selection of transformants harboring DNA inserts. The vector is based on plasmid pTR262 (Roberts et al. Gene, 12, (1980), 123-127) in which the tetracycline resistance gene is under transcriptional control of the repressor protein coded by the phage lambda cI gene. This plasmid has been rearranged, using in vitro recombinant techniques including oligonucleotide mediated mutagenesis to yield a smaller plasmid (4.4 kb) with unique cloning sites for EcoRI, XmaI and SmaI in addition to the unique HindIII and BclI sites. The plasmid has a functional ampicillin resistance gene and the new restriction sites (EcoRI, XmaI and SmaI) when used for cloning, give rise to tetracycline resistant transformants.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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