Folate-dependent 1-carbon transfer enzymes

Folate-dependent 1-carbon transfer enzymes represent a critical class of metabolic proteins that facilitate the movement of single-carbon units for the synthesis of essential cellular building blocks (NIH, Creative Proteomics). These enzymes, including dihydrofolate reductase (DHFR), thymidylate synthase (TYMS), and glycinamide ribonucleotide transformylase (GART), are central to the folate cycle and the methionine cycle (MDPI, AACR). Their primary biological role involves the de novo synthesis of purine and pyrimidine nucleotides, which are indispensable for DNA replication and repair, as well as the production of S-adenosylmethionine (SAM) for methylation reactions (NIH). Due to their vital role in cell proliferation, these enzymes have been long-standing therapeutic targets in oncology, where antifolate drugs like methotrexate and pemetrexed are used to induce nucleotide depletion and apoptosis in cancer cells (NIH, Creative Proteomics). Beyond cancer, these enzymes are involved in the pathophysiology of cardiovascular diseases, neurodegenerative disorders, and congenital malformations such as neural tube defects (NIH, ResearchGate). Therapeutic intervention in this pathway requires careful management due to potential side effects like myelosuppression and mucositis, reflecting the pathway's importance in normal rapidly dividing tissues (NIH, Creative Proteomics).

Other names

Folate-mediated one-carbon metabolism enzymesFolate cycle enzymesOne-carbon metabolism enzymesFolate-dependent enzymes

Antifolate drugs act as competitive inhibitors of specific folate-dependent enzymes, such as dihydrofolate reductase (DHFR) or thymidylate synthase (TYMS), thereby depleting the intracellular pool of reduced folates and inhibiting the synthesis of DNA, RNA, and proteins (NIH, Creative Proteomics).