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• W2109265505 abstract "A better understanding of aptamer function in bacteria would help to establish simple model systems for screening RNA-protein interactions within an intracellular context. Escherichia coli DNA polymerase I mutants (Pol I(ts)) fail to grow at 37 degrees C unless an exogenous DNA polymerase such as HIV-1 reverse transcriptase (RT) is expressed within the cell. Here, we show that four RNA aptamers that inhibit HIV-1 RT in vitro block complementation by HIV-1 RT when expressed in vivo. No other essential functions are impaired by aptamer expression at either temperature. Intracellular aptamer RNA concentrations from induced cultures were measured to range from 76 to 180 nM, which is comparable with exogenously expressed HIV-1 RT levels in these cells. RT polymerase activity was reduced to background levels in cell-free extracts prepared from cultures expressing both HIV-1 RT and the 70.28 aptamer, compared with extracts from cultures expressing HIV-1 RT alone. Intracellularly expressed RNA aptamers can thus be used to generate conditional null mutants in bacteria by titrating an essential protein." @default.
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• W2109265505 date "2003-08-15" @default.
• W2109265505 modified "2023-10-12" @default.
• W2109265505 title "Inhibition of HIV-1 reverse transcriptase by RNA aptamers in Escherichia coli" @default.
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• W2109265505 doi "https://doi.org/10.1261/rna.5550103" @default.
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