Purine metabolism enzymes involved in DNA synthesis (null)

The phrase "Purine metabolism/DNA synthesis inhibition via incorporation into DNA by lymphocytes" combines two overlapping but distinct biochemical processes and is not a standard canonical target. Purine metabolism encompasses a network of enzymes and steps essential for the production and recycling of purine nucleotides required for DNA and RNA synthesis. Enzymatic targets within the purine biosynthesis pathway (such as amidophosphoribosyltransferase, GAR synthetase, PAICS, ATIC, and others) are essential in rapidly dividing cells, including lymphocytes, where DNA synthesis is high[1][5]. DNA synthesis inhibition in lymphocytes is therapeutically targeted via drugs and mechanisms that disrupt purine metabolism, such as methotrexate (which inhibits dihydrofolate reductase and depletes precursors for purine biosynthesis), cytarabine (an antimetabolite incorporated into DNA), and actinomycin D. These interventions either deplete pools of purine nucleotides or are incorporated into DNA, thereby terminating chain elongation or causing DNA damage[2][5][3]. Inhibiting purine metabolism can impair DNA repair and cell proliferation, making this pathway a key target in oncology (especially for leukemias and lymphomas) and immunosuppression[3][1]. The precise target here is not a single molecule or enzyme, but rather several enzymes within the purine biosynthesis pathway (collectively or via the multienzyme "purinosome" complex)[1]. Therefore, the original target name is too broad and lacks the specificity typically expected in a therapeutic target definition. It is best described as a pathway-level target encompassing specific enzymes involved in de novo purine synthesis, which can be disrupted to inhibit lymphocyte proliferation or DNA synthesis in pathological contexts such as cancer or autoimmune disease[1][5][3].

Other names

Purine biosynthesis enzymesDe novo purine synthesis pathway enzymesPurinosome components

Inhibition of de novo purine synthesis; Inhibition of DNA synthesis via nucleotide depletion or incorporation of antimetabolites into DNA[5][2][3]