Ohtsuka E, Tanaka S, Tanaka T, Miyake T, Markham A F, Nakagawa E, Wakabayashi T, Taniyama Y, Nishikawa S, Fukumoto R, Uemura H, Doi T, Tokunaga T, Ikehara M
Proc Natl Acad Sci U S A. 1981 Sep;78(9):5493-7. doi: 10.1073/pnas.78.9.5493.
A RNA molecule has been synthesized that is identical in sequence to Escherichia coli tRNAfMet except that it lacks the base modifications present in the E. coli tRNA. This was achieved by enzymatic joining of chemically synthesized oligonucleotides with chain lengths of 3-10 which were synthesized by the phosphodiester or phosphotriester method. First, quarter molecules of tRNA were constructed by joining of chemically synthesized fragments with RNA ligase. The 5'-quarter molecule (bases 1-20) served as an acceptor in joining reactions with the 3',5'-bisphosphorylated donor molecule (bases 21-34). The 5'-half molecule thus obtained was treated with phosphatase and joined to the 3'-half molecule which was prepared by ligation of the other quarter molecules (bases 35-60, acceptor; bases 61-77, donor) followed by 5'-phosphorylation with polynucleotide kinase. The synthetic tRNA was characterized by oligonucleotide pattern and was partially active in aminoacylation with E. coli methionyl-tRNA synthetase.
已合成一种RNA分子,其序列与大肠杆菌甲硫氨酸起始tRNA(tRNAfMet)相同,只是缺少大肠杆菌tRNA中存在的碱基修饰。这是通过将化学合成的链长为3至10的寡核苷酸进行酶促连接实现的,这些寡核苷酸是通过磷酸二酯法或磷酸三酯法合成的。首先,通过用RNA连接酶连接化学合成的片段构建tRNA的四分之一分子。5'-四分之一分子(碱基1至20)在与3',5'-双磷酸化供体分子(碱基21至34)的连接反应中用作受体。将由此获得的5'-半分子用磷酸酶处理,并与3'-半分子连接,3'-半分子是通过连接其他四分之一分子(碱基35至60,受体;碱基61至77,供体)然后用多核苷酸激酶进行5'-磷酸化制备的。合成的tRNA通过寡核苷酸图谱进行表征,并且在用大肠杆菌甲硫氨酰-tRNA合成酶进行氨酰化反应中具有部分活性。