Add time:08/08/2019 Source:sciencedirect.com
SummaryIn response to environmental and other stresses, the σ54 subunit of bacterial RNA polymerase (RNAP) controls expression of several genes that play a significant role in the virulence of both plant and animal pathogens. Recruitment of σ54 to RNAP initiates promoter-specific transcription via the double-stranded DNA denaturation mechanism of the cofactor. The RpoN box, a recognition helix found in the C-terminal region of σ54, has been identified as the component necessary for major groove insertion at the −24 position of the promoter. We employed the hydrocarbon stapled peptide methodology to design and synthesize stapled σ54 peptides capable of penetrating Gram-negative bacteria, binding the σ54 promoter, and blocking the interaction between endogenous σ54 and its target DNA sequence, thereby reducing transcription and activation of σ54 response genes.
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