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Title: Discovery of antibacterials that inhibit bacterial RNA polymerase interactions with sigma factors
Authors: Ye, J 
Chu, AJ
Harper, R
Chan, ST 
Shek, TL
Zhang, Y
Ip, M
Sambir, M
Artsimovitch, I
Zuo, Z
Yang, X
Ma, C 
Issue Date: 23-Jul-2020
Source: Journal of medicinal chemistry, 23 July 2020, v. 63, no. 14, p. 7695-7720
Abstract: Formation of a bacterial RNA polymerase (RNAP) holoenzyme by a catalytic core RNAP and a sigma (σ) initiation factor is essential for bacterial viability. As the primary binding site for the housekeeping σ factors, the RNAP clamp helix domain represents an attractive target for novel antimicrobial agent discovery. Previously, we designed a pharmacophore model based on the essential amino acids of the clamp helix, such as R278, R281, and I291 (Escherichia coli numbering), and identified hit compounds with antimicrobial activity that interfered with the core-σ interactions. In this work, we rationally designed and synthesized a class of triaryl derivatives of one hit compound and succeeded in drastically improving the antimicrobial activity against Streptococcus pneumoniae, with the minimum inhibitory concentration reduced from 256 to 1 μg/mL. Additional characterization of antimicrobial activity, inhibition of transcription, in vitro pharmacological properties, and cytotoxicity of the optimized compounds demonstrated their potential for further development.
Publisher: American Chemical Society
Journal: Journal of medicinal chemistry 
ISSN: 0022-2623
EISSN: 1520-4804
DOI: 10.1021/acs.jmedchem.0c00520
Rights: © 2020 American Chemical Society
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Medicinal Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Journal of Medicinal Chemistry is available at
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