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• W2003057702 abstract "A new temperature-regulated T7 RNA polymerase-driven transcription system has been developed. This system is based on a hybrid regulatory region: the phage T7 late promoter (PT7) linked to the Escherichia coli lac operator (Olac) [Giordano et al., Gene 84 (1989) 209-219], which was located in an earlier obtained [Mashko et al., Gene 97 (1991) 259-266] temperature-controlled amplifiable plasmid, carrying cat under the control of PT7-Olac and, in addition, lambda major early promoter-operator regions and gene cIts857. Plasmids of the pT7-Olac-cat-tsr series were stably maintained at a low-copy-number when grown at low temperature (28 degrees C). In E. coli BL21(DE3), carrying the Plac-controllable T7 RNA polymerase-encoding gene, efficient repression of cat transcription was observed, that was provided by the LacI repressor and, probably, the thermolabile repressor CIts857. At low and moderate temperatures (28/37 degrees C), this 'cooperative' repression was so tight that cat expression was not observed in the cells carrying PT7-Olac on the plasmids, even after IPTG-inducible T7 RNA polymerase biosynthesis. As a result of the thermo-amplification of the recombinant plasmids and temperature-inactivation of CIts857, expression of the T7 RNA polymerase-encoding gene was derepressed due to the titration of LacI by the increasing copies of Olac which in turn, led to the highly efficient T7 RNA polymerase-driven accumulation of CAT in the cells." @default.
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• W2003057702 date "1994-05-01" @default.
• W2003057702 modified "2023-09-27" @default.
• W2003057702 title "A new T7 RNA polymerase-driven expression system induced via thermoamplification of a recombinant plasmid carrying a T7 promoter-Escherichia coli lac operator" @default.
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• W2003057702 doi "https://doi.org/10.1016/0378-1119(94)90355-7" @default.
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