Chronic infections with
Staphylococcus aureus such as septicemia, osteomyelitis, endocarditis, and biofilm infections are difficult to treat because of persisters. Despite many efforts in understanding bacterial persistence, the mechanisms of persister formation in
S. aureus remain elusive. Here, we performed a genome-wide screen
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Chronic infections with
Staphylococcus aureus such as septicemia, osteomyelitis, endocarditis, and biofilm infections are difficult to treat because of persisters. Despite many efforts in understanding bacterial persistence, the mechanisms of persister formation in
S. aureus remain elusive. Here, we performed a genome-wide screen of a transposon mutant library to study the molecular mechanisms involved in persistence of community-acquired
S. aureus. Screening of the library for mutants defective in persistence or tolerance to rifampicin revealed many genes involved in metabolic pathways that are important for antibiotic persistence. In particular, the identified mutants belonged to metabolic pathways involved in carbohydrate, amino acid, lipid, vitamin and purine biosynthesis. Five mutants played a role in purine biosynthesis and two mutants,
purB, an adenylosuccinate lyase, and
purM, a phosphoribosylaminoimidazole synthetase, were selected for further confirmation. Mutants
purB and
purM showed defective persistence compared to the parental strain USA300 in multiple stress conditions including various antibiotics, low pH, and heat stress. The defect in persistence was restored by complementation with the wildtype
purB and
purM gene in the respective mutants. These findings provide new insights into the mechanisms of persistence in
S. aureus and provide novel therapeutic targets for developing more effective treatment for persistent infections due to
S. aureus.
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