Nonadeca- and octadecaribonucleotides corresponding to the D-loop of tRNAPhe from yeast and the leader sequence of phage f1 coat protein mRNA were synthesized by the activated phosphotriester method. Coupling yield in the synthesis of oligoribonucleotides depended on the extent of nucleosides loaded on controlled pore glass beads (CPG). N-Acyl-5′-O-dimethoxytrityl-2′-O-tetrahydropyranyl derivatives were used as fully protected ribonucleotide monomer units. The 18mer and 19mer corresponding to the D-loop did not serve as substrates for tRNA (guanosine-2′-)methyltransferase from T. thermophilus, but inhibited methylation of the 5′-half fragment of tRNAPhe. This indicates that both fragments possess some affinity with the enzyme.
通过活化的
磷酸三酯法合成了对应于酵母tRNAPhe D环和噬菌体f1外壳蛋白mRNA引导序列的19-mer和18-mer非十聚体和十八聚体核酸。寡
核糖核酸合成中的耦合产率依赖于加载在受控孔
玻璃珠(CPG)上的核苷量。采用N-酰基-5′-O-二甲氧基三苯甲基-2′-O-
四氢呋喃衍
生物作为完全保护的
核糖核苷单体单元。对应于D环的18mer和19mer并未作为T. thermophilus中tRNA(
鸟苷-2′-)甲基转移酶的底物,但抑制了tRNAPhe的5′-半片段的甲基化。这表明这两个片段与该酶之间存在一定的亲和性。