Other nucleotide synthesis enzymes

Other nucleotide synthesis enzymes is a broad classification used to group various enzymes involved in the production and regulation of nucleotides that do not fall into major specific categories like dihydrofolate reductase or thymidylate synthase. This group encompasses critical enzymes such as dihydroorotate dehydrogenase (DHODH), inosine monophosphate dehydrogenase (IMPDH), and ribonucleotide reductase (RNR), which are essential for the de novo synthesis and salvage pathways of purines and pyrimidines (NCBI, 2023; UniProt, 2024). These enzymes play a fundamental role in cellular homeostasis by providing the necessary precursors for DNA replication and RNA transcription, making them vital for cell growth and proliferation. Because of their central role in metabolism, they are frequently targeted in the treatment of cancer, autoimmune disorders, and viral infections to halt the rapid expansion of malignant or overactive immune cells (PubChem, 2024). Drugs like leflunomide and mycophenolate mofetil act by inhibiting these enzymes, thereby depleting the intracellular nucleotide pool and inducing cell cycle arrest. However, the therapeutic window is often narrow due to the essential nature of these enzymes in all dividing cells, leading to common side effects such as bone marrow suppression and gastrointestinal disturbances.

Other names

Nucleotide metabolism enzymesMiscellaneous nucleotide synthesis enzymesPurine and pyrimidine synthesis enzymes

Inhibition of specific enzymes within the purine or pyrimidine biosynthetic pathways, leading to depletion of intracellular nucleotide pools and subsequent inhibition of DNA/RNA synthesis.