Expansion of repertoire of modified DNAs prepared by PCR using KOD Dash DNA polymerase
作者:Tsutomu Ohbayashi、Masayasu Kuwahara、Masatoshi Hasegawa、Toshiyuki Kasamatsu、Takehiro Tamura、Hiroaki Sawai
DOI:10.1039/b504330a
日期:——
Thymidine analogues bearing a variety of functional groups at the C5-position via an amino-linker arm were prepared and the substrate activity for PCR using thermophilic KOD Dash DNA polymerase was examined. The enzyme accepted the thymidine analogues bearing pyridine, imidazole, biotin, a cationic-charged guanidinium, a cationic-charged amino, mercaptopyridyl and phenanthrolne groups at the C5-position
制备了通过氨基连接臂在C5位带有各种官能团的胸苷类似物,并检测了使用嗜热KOD Dash DNA聚合酶进行PCR的底物活性。该酶接受在C5位带有吡啶,咪唑,生物素,阳离子带电的胍盐,阳离子带电的氨基,巯基吡啶基和菲咯啉基团的胸苷类似物,形成相应的PCR产物。然而,在C5位带有羧基的胸苷类似物是较差的底物,无法获得相应的PCR产物。带有巯基的胸苷类似物也是该酶的不良底物,因为它在PCR条件下通过二硫键二聚。该酶几乎不接受带有负电荷的羧基或大体积基团的胸苷类似物作为底物。KOD Dash DNA聚合酶具有比其他任何DNA聚合酶都要宽的底物特异性,它将扩展可通过PCR制备的修饰DNA的种类。