Bacterial folic acid biosynthesis pathway ()

Bacterial folic acid biosynthesis pathway Overview

Bacterial folic acid biosynthesis pathway refers to the set of enzymatic steps by which bacteria synthesize folate (vitamin B9) de novo from basic metabolic precursors, a process absent in higher animals that obtain folate from their diet. This pathway is essential for bacterial growth because folate serves as a cofactor in one-carbon transfer reactions central to DNA synthesis, repair, and amino acid production. The pathway involves several key enzymes, including guanine cyclohydrolase (GCYH I), dihydroneopterin hydrolase (DHNTPase), dihydroneopterin aldolase (DHNA), hydroxymethyl-dihydropteridine pyrophosphokinase (HPPK), dihydropteroate synthase (DHPS), dihydrofolate synthase (DHFS), and dihydrofolate reductase (DHFR)[1][3][5][6][7][8]. Many clinically relevant antibiotics, such as sulfonamides and trimethoprim, act by inhibiting distinct steps in this pathway, leading to bacterial cell death or stasis[1][5][7][8]. Because humans lack this biosynthetic pathway, it is an attractive and validated antimicrobial target, but resistance mechanisms—arising from target mutations or alternative metabolic routes—pose ongoing therapeutic challenges[1][5][6][7].

Mechanism of Action

Inhibition of dihydropteroate synthase (e.g., by sulfonamides); Inhibition of dihydrofolate reductase (e.g., by trimethoprim)

Biological Functions

Safety Considerations

Interacting Drugs

Associated Biomarkers