Inhibitors, Agonists, Screening Data SheetBIOLOGICAL ACTIVITY: Clofarabine(Clolar; Clofarex) inhibits the enzymatic activities of ribonucleotide reductase (IC50 = 65 nM) and DNA polymerase.IC50 Value: 65 nMTarget:in vitro: Clofarabine is a second generation purine nucleoside analog with antineoplastic activity. It is phosphorylated intracellularly,which inhibits the enzymatic activities of ribonucleotide reductase (IC50 = 65 nM) and DNA polymerase, resulting in inhibition of DNArepair and synthesis of DNA and RNA. This nucleoside analog also disrupts mitochondrial function and membrane integrity, resultingin the release of pre–apoptotic factors, including cytochrome C and apoptotic–inducing factor, which activate apoptosis.in vivo: Clofarabine is used for treating relapsed or refractory acute lymphoblastic leukaemia (ALL) in children, after at least two othertypes of treatment have failed.References: [1]. Bonate et al Discovery and development of clofarabine: a nucleoside analogue for treating cancer. Nat.Rev.Drug Discov. (2006)5 855.[2]. Ghanem H, Kantarjian H, Ohanian M, Jabbour E.The Role of Clofarabine in Acute Myeloid Leukemia.Leuk Lymphoma. 2012 Sep 7.[3]. Abd Elmoneim A, Gore L, Ricklis RM, Boklan J, Cooper T, Narendran A, Rolla K, Scott T, Arceci RJ.Phase I dose–escalation trial of clofarabine followed byescalating doses of fractionated cyclophosphamide in children with relapsed or refractory acute leukemias.Pediatr Blood Cancer. 2012 Aug 8. doi:10.1002/pbc.24264.[4]. Thudium KE, Ghoshal S, Fetterly GJ, Haese JP, Karpf AR, Wetzler M.Synergism between clofarabine and decitabine through p53R2: A pharmacodynamicdrug–drug interaction modeling.Leuk Res. 2012 Aug 9.[5]. Aye Y, Brignole EJ, Long MJ, Chittuluru J, Drennan CL, Asturias FJ, Stubbe J.Clofarabine Targets the Large Subunit (α) of Human Ribonucleotide Reductasein Live Cells by Assembly into Persistent Hexamers.Chem Biol. 2012 Jul 27;19(7):799–805.Product Name:ClofarabineCat. No.:HY-A0005CAS No.:123318-82-1Molecular Formula:C10H11ClFN5O3Molecular Weight:303.68Target:Nucleoside Antimetabolite/Analog; AutophagyPathway:Cell Cycle/DNA Damage; AutophagySolubility:10 mM in DMSO