Combined lactate- and phosphate-dependent cytoplasmic acidification drives Mycobacterium tuberculosis growth arrest at acidic pH
This study reveals that *Mycobacterium tuberculosis* growth arrest at acidic pH on lactate is driven by phosphate-dependent cytoplasmic acidification and proton motive force dissipation, which can be suppressed by mutations in phosphate transporters that upregulate the SenX3/RegX3 regulon to restore growth.