Abstract
Bacterial sigma54 (σ54) promoters are the DNA-binding motif for σ54-containing RNA polymerase (RNAP) holoenzymes. A recent study using a combination of synthetic oligonucleotide library screening, biochemical characterization, and bioinformatics has uncovered a new and unexpected role for σ54 promoters, encoding a form of bacterial 'insulator sequence' to dampen unwanted translation.
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