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EthR is a transcriptional repressor that increases Mycobacterium tuberculosis resistance to ethionamide. In this study, the EthR–DNA interaction has been investigated by native electrospray-ionization mass spectrometry for the first time. The results show that up to six subunits of EthR are able to bind to its operator.

Graphical abstract: Structural insights into the EthR–DNA interaction using native mass spectrometry

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