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• W73190702 abstract "We have investigated the efficacy of using the Escherichia coli lac operator-repressor system to control plant gene expression. The lacI gene was modified to allow optimal expression in plant cells and then placed downstream of the cauliflower mosaic virus (CaMV) 35S RNA promoter. This construct was introduced into tobacco plants by leaf disc transformation. Transgenic tobacco plants synthesized significant quantities of LacI protein (up to 0.06% of total soluble protein). We have used the E.coli beta-glucuronidase gene (gus) as the reporter gene by placing it downstream of the maize chlorophyll a/b binding protein (CAB) gene promoter. Lac operators were introduced into several positions within the CAB promoter and operator-free plasmid was used as control. Repression was assessed by comparing the transient expression from CAB-operator-gus reporter constructs in protoplasts expressing lac protein, with that in control cells not expressing the repressor. Repression varied between 10 and 90% with different operator positions. Transient assays were also performed in the presence of the inducer, isopropyl-beta-D-thiogalactoside (IPTG). In lacI protoplasts the presence of IPTG manifested itself in a 4.2-fold relief of repression. The study was extended to show regulation of expression in stable transformants. Tobacco transformants harbouring a CAB-operator-gus reporter construct and the lacI gene were shown to have repressed GUS levels, but in the presence of IPTG, repression was relieved 15-fold. We conclude that the lac repressor can enter the plant cell nucleus, find its cognate operator sequence in the chromatin to form a repressor--operator complex and effectively block transcription of a downstream gene." @default.
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• W73190702 date "1992-04-01" @default.
• W73190702 modified "2023-09-27" @default.
• W73190702 title "Control of gene expression in tobacco cells using a bacterial operator-repressor system." @default.
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• W73190702 doi "https://doi.org/10.1002/j.1460-2075.1992.tb05169.x" @default.
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