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• W1567305461 abstract "Abstract The diester bonds of phosphorothioate trimer analogs of (A2'p5')2A (2-5A core) of the Sp stereoconfiguration were found to be extremely stable to hydrolysis by both serum and cellular phosphodiesterases. The corresponding Rp isomers, although still more stable than parent ppp(A2'p5')2A (2-5A), were significantly more susceptible to enzymatic hydrolysis than were the Sp isomers. Utilization of these novel 2-5A trimer isomers containing various combinations of Sp or Rp configurations at the internucleotidic phosphorothioate linkages revealed a further specificity of this enzymatic hydrolysis. Thus, the stereoconfiguration of the bond adjacent to the one undergoing hydrolysis influenced the rate of enzymatic hydrolysis, as well as did the chain length of the oligomer. The most stable trimer analog, which contained both internucleotide phosphorothioate linkages of the Sp configuration, had a half-life of 30 days in serum, which is a 1500-fold increase over that of parent 2-5A core. This is the first report on biochemical stability of an oligonucleotide containing more than one phosphorothioate linkage of the Sp configuration and is the first demonstration that a phosphorothioate internucleotide bond of the Sp configuration can increase the enzymatic stability of an adjacent phosphorothioate bond. In marked contrast to all previous 2-5A core analogs of increased stability, the activity (antiproliferative and antiviral) of the stable phosphorothioate 2-5A core analogs was obtained with the intact trimer, i.e., it was not attributed to antimetabolite degradation products." @default.
• W1567305461 created "2016-06-24" @default.
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• W1567305461 date "1986-05-01" @default.
• W1567305461 modified "2023-09-26" @default.
• W1567305461 title "Stereoconfiguration markedly affects the biochemical and biological properties of phosphorothioate analogs of 2-5A core, (A2'p5')2A." @default.
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• W1567305461 doi "https://doi.org/10.1016/s0021-9258(17)38484-3" @default.
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• W1567305461 hasPublicationYear "1986" @default.
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