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• W67508205 abstract "Various adenosine acyclonucleoside derivatives were tested as inhibitors of 5'-deoxy-5'-methylthioadenosine (MeSAdo) phosphorylase, an enzyme involved in the salvage of adenine and methionine from MeSAdo. The 2-halogenated derivatives of acyloadenosine [9-(2-hydroxyethoxy-methyl)adenine], including the chloro-, bromo- and iodo-congeners, all inhibited murine Sarcoma 180 (S180) MeSAdo phosphorylase, with Ki values in the range of 10(-6) to 10(-5) M. Halogenated derivatives of 9-(1,3-dihydroxy-2-propoxymethyl)adenine, which more closely resemble the natural substrate, were substantially more potent inhibitors of the enzyme, with Ki values in the range of 2-7 x 10(-7) M. 5'-Methylthio and 5'-halogenated analogs of 2'-deoxy-1',2'-seco-adenosine were weak inhibitors, with Ki values of 10(-4) M or greater. 9-[(1-Hydroxy-3-iodo-2-proxy)methyl]adenine. (HIPA), the derivative with the lowest Ki values among these analogs, was a competitive inhibitor of S180 MeSAdo phosphorylase. In preliminary studies, HIPA inhibited MeSAdo phosphorylase in intact HL-60 human promyelocytic leukemia cells, as it limited the incorporation of [8-14C]MeSAdo into cellular adenine nucleotide pools. In addition, 9-(phosphonoalkyl)adenines, representing potential multisubstrate inhibitors of MeSADo phosphorylase, were synthesized. Of these the heptyl derivative was the most potent inhibitor, with a Ki of 1.5 x 10(-5) M at low (3.5 mM) phosphate concentrations. The inhibitory effects of these analogs could be ablated at high phosphate concentrations (50 mM), suggesting that they interact with the phosphate binding site on the enzyme. Some of these novel MeSAdo phosphorylase inhibitors may have a role in cancer chemotherapy as potentiators of agents that block purine de novo synthesis, e.g. antifolates and 6-methylmercaptopurine ribonucleoside." @default.
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• W67508205 date "1990-12-01" @default.
• W67508205 modified "2023-09-26" @default.
• W67508205 title "5'-Deoxy-5'-methylthioadenosine phosphorylase—V" @default.
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• W67508205 doi "https://doi.org/10.1016/0006-2952(90)90087-2" @default.
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