Jefferson EA, Arakawa S, Blyn LB, Miyaji A, Osgood SA, Ranken R, Risen LM, Swayze EE. New inhibitors of bacterial protein synthesis from a combinatorial library of macrocycles.
J Med Chem 2002;
45:3430-9. [PMID:
12139453 DOI:
10.1021/jm010437x]
[Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A mixture-based combinatorial library of 14-membered macrocycles was synthesized to target ribosomal RNA and uncover a new class of antibacterial agents. High-throughput screening identified a macrocyclic mixture that inhibited cell-free-coupled transcription/translation in Escherichia coli-derived extracts, with an IC(50) value in the 25-50 microM range. In a follow-up library of 64 single macrocycles, 8 gave IC(50) values ranging from 12 to 50 microM in the cell-free protein synthesis inhibition assay. Some of the macrocycles were screened in a translation inhibition assay, and IC(50) values generally paralleled those obtained in the uncoupled transcription/translation assay. Additional analogues were prepared in a preliminary structure-activity relationship study, and more potent macrocycles were identified with low micromolar activity (IC(50) values = 2-3 microM). Some of these macrocycles displayed antibacterial activity against lipopolysaccharide mutant E. coli bacterial cells (IC(50) values = 12-50 microM).
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