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Fludarabine triphosphate (F-ara-ATP), the active metabolite of Fludarabine (HY-B0069), is a potent, noncompetitive and specific inhibitor of DNA primase, with an IC50 of 2.3 μM and a Ki of 6.1 μM. Fludarabine triphosphate inhibits DNA synthesis by blocking DNA primase and primer RNA formation. Fludarabine triphosphate inhibits ribonucleotide reductase and DNA polymerase and ultimately leads to cellular apoptosis[1][2].

[1] Catapano CV, et al. Inhibition of primer RNA formation in CCRF-CEM leukemia cells by fludarabine triphosphate. Cancer Res. 1991 Apr 1;51(7):1829-35. PMID:1706219
[2] Woodahl EL, et al. A novel phenotypic method to determine fludarabine triphosphate accumulation in T-lymphocytes from hematopoietic cell transplantation patients. Cancer Chemother Pharmacol. 2009 Feb;63(3):391-401. DOI:10.1007/s00280-008-0748-0