Methylfolate Trap Promotes Bacterial Thymineless Death by Sulfa Drugs

Area of Science:

• Microbiology
• Biochemistry
• Genetics

Background:

• The methylfolate trap, a metabolic blockage linked to human diseases, was previously unstudied in bacteria.
• Bacteria synthesize folate de novo, making the relevance of the methylfolate trap unknown.

Purpose of the Study:

• To investigate the methylfolate trap's role in bacterial intrinsic death induced by sulfonamides.
• To explore the methylfolate trap as a potential target for enhancing antibiotic efficacy.

Main Methods:

• Genetic mutagenesis and chemical complementation were used to study metabolic pathways.
• Metabolomic profiling was employed to analyze metabolic imbalances.
• Antivitamin B12 molecules were used to restrict vitamin B12 bioavailability.

Main Results:

• The methylfolate trap was identified as a novel determinant of bacterial death by sulfonamides.
• Trap-mediated metabolic imbalances induced thymineless death (thymine starvation).
• Restricting vitamin B12 bioavailability sensitized bacteria to sulfonamides.

Conclusions:

• The methylfolate trap is a significant factor in bacterial susceptibility to sulfonamides.
• Inducing the methylfolate trap boosts sulfonamide bactericidal activity in Gram-negative bacteria and mycobacteria.
• Targeting the methylfolate trap presents a novel strategy to combat bacterial pathogens.