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• W2007230994 abstract "Fifty-six pyrimidine analogs were tested as possible inhibitors of uridine phosphorylase from Giardia lamblia. Values of Ki were determined for eight of these which demonstrated an inhibition greater than 60% under the standard conditions of uridine at 1 mM (approximately 1.5 times the Km) and inhibitor at 1 mM. All were competitive with respect to uridine. The most effective inhibitors were uracil analogs substituted at the C-5 position with electron withdrawing groups (nitro groups or halogens). The inhibitory effect at the 5-position appeared to be further enhanced by substitution at the C-6 position with electron releasing groups. The order of effectiveness as inhibitors was 6-methyl-5-nitrouracil greater than 6-amino-5-nitrouracil greater than 5-benzylacyclouridine greater than 5-nitrouracil greater than 5-fluorouracil greater than 5-bromouracil greater than 6-benzyl-2-thiouracil greater than 1,3-dimethyluracil with Ki values of 10, 12, 44, 56, 119, 230, 190 and greater than 1000 microM, respectively. The compounds were also effective inhibitors of the thymidine phosphorylase activity of the enzyme. The effect of the more potent compounds on G. lamblia in in vitro culture are currently under investigation." @default.
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• W2007230994 date "1989-11-01" @default.
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• W2007230994 title "Inhibition of uridine phosphorylase from Giardia lamblia by pyrimidine analogs" @default.
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• W2007230994 doi "https://doi.org/10.1016/0006-2952(89)90586-8" @default.
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