Studies on deoxynucleic acids and related compounds. VI. Synthesis of oligodeoxyribonucleotides containing recognition sequences for restriction endonucleases.
作者:EIKO OHTSUKA、SUSUMU SHIBAHARA、MORIO IKEHARA
DOI:10.1248/cpb.30.1307
日期:——
An octanucleotide dACCCGGGT and decanucleotide dCGACCCGGGT have been synthesized by an improved phosphotriester method. The octanucleotide has a selfcomplementary sequence and the decanucleotide has two protruding nucleotides when it forms a duplex. Thermal properties and circular dichroism spectra of these oligonucleotides have been investigated under various conditions to find differences in the stabilities of these oligonucleotides. A possible concatemer structure of the decanucleotide duplex is suggested on the basis of its circular dichroism spectra in concentrated solution.
Studies on deoxyribonucleic acids and related compounds. III. Synthesis of oligodeoxyribonucleotides complementary to the anticodon loop of Escherichia coli tRNA by an improved triester method.
作者:EIKO OHTSUKA、SUSUMU SHIBAHARA、MORIO IKEHARA
DOI:10.1248/cpb.29.3440
日期:——
p-Chlorophenyl N-(p-methoxyphenyl) chlorophosphoramidate was used to phosphorylate the 3'-hydroxyl groups of N, 5'-O-protected deoxyribonucleosides. These nucleotides served as the 3'-terminal unit in the synthesis of fully protected oligonucleotides, and the p-anisidine was readily removed by treatment with isoamyl nitrite to generate the 3'-phosphodiester for condensations. This approach was suitable for complete purification of fully protected oligonucleotides by chromatography, which was essential to obtain products. Deoxyoligonucleotides complementary to the anticodon loop of E. coli tRNAMetf were synthesized by condensation of di-, tri- and tetranucleotide blocks (dATp, dTATp and dTTATp) with protected dGAG. The products (dA-T-G-A-G, d-T-A-T-G-A-G and d-T-T-A-T-G-A-G) were isolated by anion-exchange or reverse phase high pressure liquid chromatography.