Key result
Depletion of release factor 2 in S-30 extracts led to the accumulation of Arg(12)-TnaC-tRNA(Pro), preventing Rho-dependent transcription termination and mimicking normal induction.
Population
In vitro models of Escherichia coli (S-30 preparations and minimal in vitro transcription system)
Comparison
Depletion of release factor 2, synthesis of… vs Normal S-30 preparations and absence of added…
Design
Preclinical
Authors
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Elucidates bacterial transcription antitermination mechanism; leaves open translation to eukaryotic systems or therapeutic targeting.
This basic science study elucidates the mechanism of tryptophan-induced transcription antitermination in E. coli, showing that RNA sequences adjacent to the tnaC stop codon contribute significantly to Rho-dependent termination.
Gong et al. (2002) studied Escherichia coli tna operon expression. Release factor 2 depletion vs. Normal S-30 preparations was evaluated on Rho-dependent transcription termination and accumulation of Arg(12)-TnaC-tRNA(Pro). Depletion of release factor 2 in S-30 extracts led to the accumulation of Arg(12)-TnaC-tRNA(Pro), preventing Rho-dependent transcription termination and mimicking normal induction.
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