Glutamate metabolism: an essential component for persistence in Staphylococcus aureus

Virulence determinants, immune evasion strategies, and antibacterial tolerance/resistance mechanisms are often presented as hallmarks of bacterial pathogenesis. Behind each of these morbific features, there exist fundamental metabolic pathways that enable the local environment to define and shape their utilization. In a recent study, X. Wen, T. Tang, T. Bao, T. Xu, et al. (Microbiol Spectr 13:e00511-25, 2025, https://doi.org/10.1128/spectrum.00511-25) investigated how glutamate availability directly influences persister formation in Staphylococcus aureus. Utilizing a mutant strain deficient in glutamate synthase activity (ΔgltB), Wen and colleagues effectively demonstrated that this key metabolic pathway is important for the survival of the microbe during heat-, antibiotic-, and oxidative-induced stress. The ΔgltB strain also exhibited decreases in biofilm formation, staphyloxanthin production, plasma coagulation, and a lower LD50 in a BALB/c intraperitoneal infection model. These results suggest that glutamate availability is a key metabolic switch essential for maintaining persister cells in S. aureus.