Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 89, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2023.129301
Keywords
Staphylococcus aureus; Methicillin-resistant S; aureus; 2-Aminobenzothiazole; Antibacterial; Multidrug efflux pump
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A collection of small molecule compounds was screened against drug-resistant bacterial pathogens, and compound 1 was found to be a potent inhibitor of Staphylococcus aureus and methicillin-resistant S. aureus. However, it showed no activity against Gram-negative bacteria. Further analysis revealed that the N-propyl imidazole moiety was critical for the antibacterial activity.
An internal collection of commercial and synthetically derived small molecule compounds was screened against several drug-resistant bacterial pathogens. Compound 1, a known N, N-disubstituted 2-aminobenzothiazole, was found to be a potent inhibitor of Staphylococcus aureus and several associated clinically relevant strains of methicillin-resistant S. aureus suggesting a possible novel mechanism of inhibition. It failed to show activity in any of the Gram-negative pathogens it was tested in. Evaluation in Escherichia coli BW25113 and Pseudomonas aeruginosa PAO1, as well as in their respective hyperporinated and efflux pump-deletion mutants revealed that activity in Gram-negative bacteria is diminished because this benzothiazole scaffold is a substrate for bacterial efflux pumps. Several analogs of 1 were synthesized to generate basic structure-activity relationships for the scaffold which highlighted that the N-propyl imidazole moiety was critical for the observed antibacterial activity.
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