A deoxyribohexanucleotide corresponding to a restriction endonuclease (Eco RI) recognition sequence, d-G-A-A-T-T-C, was synthesized by stepwise condensation of mononucleotides using dicyclohexylcarbodiimide (DCC) or 2, 4, 6-triisopropylbenzenesulfonyl chloride (TPS) as the condensing reagent. Protected oligonucleotides were separated by ion-exchange chromatography or gel filtration and the deblocked hexanucleotide was purified by DEAE-cellulose column chromatography in the presence of 7 M urea. The product was characterized by enzymatic hydrolysis and its temperature-absorption profile was measured at high ionic strength.
使用二环己基碳二
亚胺(
DCC)或 2,4,6-
三异丙基苯磺酰氯(TPS)作为缩合试剂,通过逐步缩合单核苷酸,合成了与限制性内切酶(Eco RI)识别序列 d-G-A-A-T-T-C 相对应的脱氧
核糖六核苷酸。受保护的寡核苷酸经离子交换色谱或凝胶过滤分离,脱锁的六核苷酸在 7 M
尿素存在下经
DEAE-
纤维素柱层析纯化。通过酶
水解对产物进行了表征,并在高离子强度下测量了其温度-吸收曲线。