AMR Gene Family
Alternative dihydropteroate synthase dfr present on plasmids produces alternate proteins that are less sensitive to trimethoprim from inhibiting its role in folate synthesis, thus conferring trimethoprim resistance.
Antibiotic
Trimethoprim is a synthetic 5-(3,4,5- trimethoxybenzyl) pyrimidine inhibitor of dihydrofolate reductase, inhibiting synthesis of tetrahydrofolic acid. Tetrahydrofolic acid is an essential precursor in the de novo synthesis of the DNA nucleotide thymidine. Trimethoprim is a bacteriostatic antibiotic mainly used in the prophylaxis and treatment of urinary tract infections in combination with sulfamethoxazole, a sulfonamide antibiotic.
Drug Class
Diaminopyrimidines are a class of organic compounds containing a pyrimidine ring substituted by two amine groups. They are inhibitors of dihydrofolate reductase, an enzyme critical for DNA synthesis.
Resistance Mechanism
Replacement or substitution of antibiotic action target, which process will result in antibiotic resistance.