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首页> 外文期刊>Biochemistry >Crystal Structure of DNA Polymerase β with DNA Containing the Base Lesion Spiroiminodihydantoin in a Templating Position
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Crystal Structure of DNA Polymerase β with DNA Containing the Base Lesion Spiroiminodihydantoin in a Templating Position

机译:DNA聚合酶β的晶体结构,在模板位置含碱基损伤的螺亚胺二乙内酰脲

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摘要

The first high-resolution crystal structure of spiroiminodihydantoin (dSp1) was obtained in the context of the DNA polymerase β active site and reveals two areas of significance. First, the structure verifies the recently determined S configuration at the spirocyclic carbon. Second, the distortion of the DNA duplex is similar to that of the single-oxidation product 8-oxoguanine. For both oxidized lesions, adaptation of the syn conformation results in similar backbone distortions in the DNA duplex. The resulting conformation positions the dSp1 A-ring as the base-pairing face whereas the B-ring of dSp1 protrudes into the major groove.
机译:在DNA聚合酶β活性位点的背景下获得了螺氨基二乙内酰脲(dSp1)的第一个高分辨率晶体结构,揭示了两个重要的领域。首先,该结构验证了在螺环碳上最近确定的S构型。第二,DNA双链体的变形类似于单氧化产物8-氧鸟嘌呤的变形。对于两个氧化损伤,顺式构象的适应导致DNA双链体中相似的骨架扭曲。所得的构型将dSp1 A环定位为碱基配对面,而dSp1的B环突出到主凹槽中。

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