Transglutaminase‐Mediated Synthesis of a DNA–(Enzyme)
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Probe for Highly Sensitive DNA Detection
作者:Momoko Kitaoka、Yukito Tsuruda、Yukari Tanaka、Masahiro Goto、Masayuki Mitsumori、Kounosuke Hayashi、Yoshiyuki Hiraishi、Katsuyuki Miyawaki、Sumihare Noji、Noriho Kamiya
DOI:10.1002/chem.201003744
日期:2011.5.2
to the DNA template and the recombinant enzyme, a DNA–(enzyme)n conjugate with 1:n stoichiometry was successfully obtained. The enzyme/DNA ratio of the conjugate increased as the benzyloxycarbonyl‐L‐glutaminylglycine (Z‐QG) moiety increased in the DNA template. The potential utility of the new conjugate decorated with signaling enzymes was validated in a dot blot hybridization assay. The DNA–(enzyme)n
使用天然的交联催化剂微生物转谷氨酰胺酶(MTG),探索了一种具有新颖结构的DNA-酶结合物的新合成策略。将MTG的谷氨酰胺供体底物肽引入到三磷酸脱氧尿苷的嘧啶上的5位,通过聚合酶链反应(PCR)制备具有多个谷氨酰胺供体位点的DNA链。通过基因工程,将包含MTG反应性赖氨酸残基的底物肽融合至激烈热球菌(Pfu AP)的热稳定碱性磷酸酶的N末端。通过酶结合将MTG的底物部分引入DNA模板和重组酶,即DNA-(酶)n与1:n的结合物。化学计量已成功获得。随着DNA模板中苄氧羰基-L-谷氨酰胺基甘氨酸(Z-QG)部分的增加,结合物的酶/ DNA比率增加。在斑点印迹杂交测定法中验证了用信号酶修饰的新缀合物的潜在效用。DNA-(酶)n探针可以在苛刻的杂交条件下清楚地检测到10 4个具有互补序列的靶核酸,从而实现了简单的检测过程,而无需进行基于常规半抗原-抗体反应的繁琐的结合/游离过程DNA检测系统。