To investigate the efficiency of expression of synthetic genes, deoxyribonucleic acid (DNA) duplexes (33-37 base pairs) containing the ribosome binding site (S.D. sequence) for trpL and appropriate termini were synthesized. This involved chemical synthesis of 8 oligonucleotides with chain lengths of 16-19 by the solid-phase phosphotriester method followed by enzymatic joining with DNA ligase. The duplexes were designed to replace a restriction fragment from a plasmid containing the trp promoter and a synthetic human growth hormone gene. The S.D. sequence in these duplexes was located upstream from a Cla I site to make a distance of 9, 11 or 13 bases from the initiation signal (ATG).
为了研究合成
基因的表达效率,我们合成了含有 trpL
核糖体结合位点(S.D. 序列)和适当末端的
脱氧核糖核酸(DNA)双链体(33-37 碱基对)。这包括通过固相
磷酸酯法
化学合成 8 个链长为 16-19 的寡核苷酸,然后用 DNA 连接酶进行酶连接。这些双链的设计目的是取代含有 trp 启动子和合成人类生长激素
基因的质粒中的限制性片段。这些双链中的 S.D. 序列位于 Cla I 位点的上游,与启动信号(ATG)的距离为 9、11 或 13 个碱基。