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Excision of Damaged Thymine Residues from Gamma-Irradiated Poly(dA-dT) by Crude Extracts of Escherichia coli

机译:大肠杆菌粗提物从γ-射线辐照的聚(dA-dT)中除去受损的胸腺嘧啶残基

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摘要

Crude extracts of E. coli endo I- and E. coli endo I-uvrA6- possess the ability to remove thymine products of the 5,6-dihydroxy-dihydrothymine type from γ-irradiated or osmium tetroxide-oxidized poly(dA-dT). It is shown that the uvrA-gene product, which is responsible for incision close to photodimers in prereplication ultraviolet repair in E. coli, is not required for, but may aid in, the excision of γ-ray products of the 5,6-dihydroxy-dihydrothymine type. Ring-damaged thymine products are also removed by E. coli extracts from osmium tetroxide-oxidized poly(dA-dT), which contains only 5,6-dihydroxy-dihydrothymine but no strand breakage, indicating that product excision occurs in the absence of radiation-induced breaks. On the average, 8 to 16 nucleotides are removed from the polymer per ring-damaged thymine residue excised by extracts from both strains and for γ-irradiated and osmium tetroxide-oxidized polymer.
机译:大肠杆菌内切I-和大肠杆菌内切I-uvrA6-的粗提物具有从γ-射线或四氧化oxide氧化的聚(dA-dT)中除去5,6-二羟基-二氢胸腺嘧啶类型的胸腺嘧啶的能力。结果表明,uvrA基因产物在大肠杆菌的复制前紫外线修复中负责与光二聚体接近的切口,但对于切除5,6,6-γ射线产物不是必需的,但可能有助于二羟基二氢胸腺嘧啶型。环损坏的胸腺嘧啶产物也可以通过四氧化-氧化的聚(dA-dT)的大肠杆菌提取物去除,该产物仅包含5,6-二羟基二氢胸腺嘧啶,但没有链断裂,表明在没有辐射的情况下会发生产物切除引起的休息。平均而言,对于从两个菌株中提取的化合物,以及对于经γ辐照和四氧化氧化的聚合物,每个环上被破坏的胸腺嘧啶残基均会从聚合物中去除8至16个核苷酸。

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