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Purine riboside-5'-O-triphosphate sodium, an active metabolite of Nebularine (HY-103694), acts as an inhibitor of DNA primase ATP and GTP polymerization activities, with IC50 values of 35 μM and 28 μM for the human enzyme, respectively. Purine riboside-5'-O-triphosphate sodium inhibits calmodulin-dependent protein kinase II (CaMKII) with a Ki value of 590 μM[1][2][3].

[1] Kozlowska M, et al. ATP depletion, purine riboside triphosphate accumulation and rat thymocyte death induced by purine riboside. Toxicol Lett. 1999;104(3):171-181. DOI:10.1016/s0378-4274(98)00369-5
[2] Moore CL, et al. Human DNA primase uses Watson-Crick hydrogen bonds to distinguish between correct and incorrect nucleoside triphosphates. Biochemistry. 2004;43(38):12367-12374. DOI:10.1021/bi0490791
[3] Kwiatkowski AP, et al. Mapping of the adenosine 5'-triphosphate binding site of type II calmodulin-dependent protein kinase. Biochemistry. 1987;26(24):7636-7640. DOI:10.1021/bi00398a016