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A plasmid cloning vehicle allowing regulated expression of eukaryotic DNA in bacteria.
Polisky B
,
Bishop RJ
,
Gelfand DH
.
Abstract
We have constructed a plasmid cloning vehicle in which transcription of inserted heterologous DNA fragments can be regulated by a defined bacterial operator and promoter. The lambda plac 5 EcoRIDNA fragment containing the operator, promoter, and beta-galactosidase gene of the lactose operon was linked to the ColE1 derivative plasmid pSF2124, creating a plasmid designated pBGP100, pBGP100 contains one EcoRI site at the lac DNA/pSF2124 DNA junction and another at the lambda DAN/pSF2124 DNA junction. We deleted the latter EcoRI site to generate a plasmid (pBGP120) retaining a single EcoRI site at the lac DNA/nSF2124 DNA junction. To determine whether DNA introduced at the EcoRI site of pBGP120 was expressed under lactose control, we inserted the EcoRI fragment containing 28S ribosomal DNA of Xenopus laevis, creating the hybrid plasmid pBGP123. RNA-DNA hybridization of pulse-labeled RNA from cells containing pBGP123 showed that induction of the lac operon increases the percentage of labeled RNA complementary to Xenopus 28S DNA about 9-fold. This vehicle may be of use for production of eukaryotic gene products in bacteria.
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