Quinoxaline 1,4-di-iV-oxides(QdNOs) are widely known as potent antibacterial agents,whereas the antibacterial mechanisms are incompletely *** the transcriptomic and proteomic profiles of Escherichia coli exposed QdNOs...
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Quinoxaline 1,4-di-iV-oxides(QdNOs) are widely known as potent antibacterial agents,whereas the antibacterial mechanisms are incompletely *** the transcriptomic and proteomic profiles of Escherichia coli exposed QdNOs were integratively investigated,demonstrating that QdNOs mainly induced SOS response and oxidative ***,genes and proteins involved in bacterial metabolism,cellular structure maintenance,resistance and virulence were also changed,conferring the bacterial survival *** assays showed that reactive oxygen species were induced in the QdNO-treated bacteria,and free radical scavengers attenuated the antibacterial action of QdNOs and DNA damage,suggesting an oxidative-DNA-damage action of *** QdNO radical intermediates,probably carbon-centered and aryl-type radicals as identified by electron paramagnetic resonance were the major radicals induced by QdNOs,and the xanthine oxidase was one of the QdNO-activating *** study gives new insights into the action of QdNOs in a systematic way as well as the current knowledge of bacterial physiology under antibiotic stresses,which can be of great value in developing new antibiotic-potentiating strategies.
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