eLife assessment
In this important study, Baniulyte and Wade provide solid evidence that translation of a short ORF denoted toiL positioned upstream of the topAI-yjhQP operon is responsive to different ribosome-targeting antibiotics, consequently controlling translation of the TopAI toxin as well as Rho-dependent transcription termination. Strengths of the study include combining a genetic screen to identify 23S rRNA mutations that affect topA1 expression and a creative approach to map the different locations of ribosome stalling within toiL induced by different antibiotics, with ribosome profiling and RNA structure probing by SHAPE to examine consequences of different antibiotics on toiL-mediated regulation. The work could be improved by examining the physiological consequences of topAI-yjhQP activation on antibiotic exposure and by resolving discrepancies between the SHAPE data and the translation rate of toiL.