nucleoside was converted to its 5′-triphosphate (dHTP) for studies with DNA polymerases and incorporated into a template by using standard phosphoramidite chemistry. In the template, dH directed the incorporation of dATP and to a lesser extent dGTP into the transcript and dHTP was efficiently incorporated at the 3′-end of a primer opposite dA using both exonuclease free Klenow fragment (KF exo-) and Taq
呋喃并
嘧啶核苷与无
水肼的亲核开环和重排反应提供了一个新颖的6,6-双环
嘧啶并
吡嗪-7-核苷(dH,4),其结构已通过X射线晶体学证实。将该新的核苷转化为其5'-
三磷酸(dHTP)以进行
DNA聚合酶研究,并使用标准亚
磷酰胺
化学方法将其掺入模板中。在模板中,dH指导将d
ATP和较小程度的dGTP掺入转录本,并使用无核酸外切酶的Klenow片段(KF exo-)和Taq
DNA聚合酶将dHTP有效地掺入与dA相反的引物的3'端。并使用自然dNTP进行扩展。