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Thymidine phosphorylase (TP) is an important target enzyme for cancer chemotherapy because it is expressed at high levels in the hypoxic regions of many tumors and inhibitors of TP have been shown in animal model studies to inhibit angiogenesis and metastasis, and to promote tumor cell apoptosis. The 5-halo-6-[(2'-aminoimidazol-1'-yl)methyl]uracils (3, X =(More)
A series of xanthine oxidase-activated prodrugs of known inhibitors of thymidine phosphorylase has been designed and synthesised to introduce tumour selectivity. These prodrugs were oxidised by xanthine oxidase at C-2 and/or C-4 of the uracil ring to generate the desired TP inhibitor.
This research describes the effects of structural variation and medium effects for the novel split-oligonucleotide (tandem) probe systems for exciplex-based fluorescence detection of DNA. In this approach the detection system is split at a molecular level into signal-silent components, which must be assembled correctly into a specific 3-dimensional(More)
Porphyrins and porphines strongly inhibit the action of the RNA subunit of the Escherichia coli ribonuclease P (M1 RNA). Meso-tetrakis(N-methyl-pyridyl)porphine followed linear competitive kinetics with pre-tRNA(Gly1) from E. coli as variable substrate (Ki 0.960 microM). Protoporphyrin IX showed linear competitive inhibition versus pre-tRNA(Gly1) from E.(More)
Thymidine phosphorylase (TP) is over-expressed in various tumour types and plays an important role in tumour angiogenesis, growth, invasion and metastasis. The enzymatic activity of TP is required for the angiogenic effect of TP, therefore, inhibitors of TP are of significant interest in cancer chemotherapy. A series of xanthine oxidase (XO) activated(More)
Thymidine phosphorylase (TP) is an angiogenic growth factor and a target for anticancer drug design. Molecular modeling suggested that 2'-aminoimidazolylmethyluracils would be potent inhibitors of TP. The novel 5-halo-2-aminoimidazolylmethyluracils (4b/4c) were very potent inhibitors of E. coli TP (IC50 approximately 20 nM). Contrastingly, the corresponding(More)
Scorpion probes, specific DNA probe sequences maintained in a hairpin-loop, can be modified to carry the components of an exciplex for use as a novel fluorescence-based method for specific detection of DNA. The exciplex partners (5'-pyrenyl and 3'-naphthalenyl) were attached to oligonucleotides via phosphoramidate links to terminal phosphate groups.(More)
Structure-based computational screening of the National Cancer Institute database of anticancer compounds identified novel non-nucleobase-derived inhibitors of human thymidine phosphorylase as candidates for lead optimization. The hierarchical in silico screening strategy predicted potentially strong low molecular weight ligands exhibiting a range of(More)
A series of novel imidazolyluracil conjugates were rationally designed and synthesised to probe the active site constraints of the angiogenic enzyme, thymidine phosphorylase (TP, E.C. 2.4.2.4). The lead compound in the series, 15d, showed good binding in the active site of human TP with an inhibition in the low muM range. The absence of a methylene bridge(More)
We report the first use of exciplex-based split-probes for detection of the wild type and *3 mutant alleles of human cytochrome P450 2C9. A tandem 8-mer split DNA oligonucleotide probe system was designed that allows detection of the complementary target DNA sequence. This exciplex-based fluorescence detector system operates by means of a contiguous(More)