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- W2951262433 abstract "A 2'-O-methyluridylic acid derivative 3 having a cyclic structure linked between the 5-position of the uracil residue and the 5'-phosphate group was synthesized. The NMR analysis suggests that this cyclouridylic acid derivative has exclusively the C3'-endo conformation that is in favor of duplex formation with RNA. Two oligonucleotides ¿pc3Um(pT)(9) and pc3Um(pU)(9) incorporating this cyclouridylic acid unit at the 5'-terminal site were synthesized by using the fully protected cyclouridylic acid 3'-phosphoramidite derivative 11 in the solid-phase synthesis. To examine the actual effect of this cyclic structure on the thermal stability of duplexes between the modified oligonucleotides and their complementary oligonucleotides, two oligonucleotides ¿pUm(pT)(9) and pUm(pU)(9) having an acyclic structure were also synthesized. As the complementary oligonucleotides, dA(pdA)(9) and A(pA)(9) were used for T(m) experiments with these 5'-terminal modified oligonucleotides. The T(m) values of all the possible duplexes were measured. These results clearly show that the duplex of pc3Um(pT)(9)-A(pA)(9) has a higher T(m) value by 5.5 degrees C than that of A(pA)(9)-T(pT)(9). This is rather significant compared with all other cases. Moreover, the T(m) value of pc3Um(pT)(9)-A(pA)(9) is 4.5 degrees C higher than that of pUm(pT)(9)-A(pA)(9). This result suggests that the cyclic structure can considerably contribute to stabilization of the duplex only in the case of the modified oligomer (DNA) and decaadenylate (RNA)." @default.
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- W2951262433 date "2000-05-18" @default.
- W2951262433 modified "2023-09-23" @default.
- W2951262433 title "Synthesis and Properties of Oligodeoxynucleotides Incorporating a Conformationally Rigid Uridine Unit Having a Cyclic Structure at the 5‘-Terminal Site" @default.
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- W2951262433 doi "https://doi.org/10.1021/jo991374h" @default.
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