Contribution of the <i>Bacillus subtilis ytrGABCDEF</i> operon to antibiotic stress adaptation

The <i>Bacillus subtilis ytrGABCDEF</i> operon is a reliable and specific marker for the inhibition of cell wall biosynthesis by antibiotics. It has therefore advanced as a common reporter in transcriptomic, proteomic, and reporter gene studies aimed at elucidating antibiotic mechanisms of action. Despite this established role, its function is poorly understood, and its contribution to survival under antibiotic exposure is debated. Here, we provide evidence that the function of the operon is not related to antibiotic stress but rather that its induction is a by-product of antibiotic-induced changes in cell wall metabolism.