Evidence for a Watson-Crick hydrogen bonding requirement in DNA synthesis by human DNA polymerase kappa.

Evidence for a Watson-Crick hydrogen bonding requirement in DNA synthesis by human DNA polymerase kappa.
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人类 DNA 聚合酶 kappa 合成 DNA 时需要 Watson-Crick 氢键的证据。

DOI:
10.1128/mcb.25.16.7137-7143.2005
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发表时间:
2005
期刊:
Molecular and cellular biology.
影响因子:
--
通讯作者:
Prakash,Satya
Prakash,Satya
中科院分区:
--
文献类型:
--
作者:
Wolfle,WilliamT;Washington,MTodd;Kool,EricT;Spratt,ThomasE;Helquist,SandraA;Prakash,Louise;Prakash,Satya

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高保真复制型DNA聚合酶(Pos)核苷酸掺入的效率和保真度受活性位点对新生碱基对施加的几何约束的控制。因此,这些聚合酶可以通过与天然DNA碱基等排但缺乏参与沃森-克里克(Watson-Crick,W-C)氢键的能力的模板碱基有效且准确地复制。然而,在存在这种类似物的情况下,能够通过DNA损伤复制的低保真度聚合酶Polη的DNA合成被抑制,表明这种聚合酶依赖于W-C氢键。在这里,我们研究了人类Polκ是否比Polη对W-C氢键的依赖性更小,人类Pol κ与Polη的不同之处在于具有更高的保真度,并且与Pol η不同,人类Pol κ在插入DNA损伤对面的核苷酸时受到抑制。我们发现一个等排的胸苷类似物被Polκ复制的效率很低,而一个缺乏小沟H键合电位的核碱基类似物被复制的效率很高。这些观察结果表明,Polη和Polκ都依赖于W-C氢键将新生碱基对定位在活性位点中以进行聚合反应,从而克服了这些酶的低几何选择性。
The efficiency and fidelity of nucleotide incorporation by high-fidelity replicative DNA polymerases (Pols) are governed by the geometric constraints imposed upon the nascent base pair by the active site. Consequently, these polymerases can efficiently and accurately replicate through the template bases which are isosteric to natural DNA bases but which lack the ability to engage in Watson-Crick (W-C) hydrogen bonding. DNA synthesis by Polη, a low-fidelity polymerase able to replicate through DNA lesions, however, is inhibited in the presence of such an analog, suggesting a dependence of this polymerase upon W-C hydrogen bonding. Here we examine whether human Polκ, which differs from Polη in having a higher fidelity and which, unlike Polη, is inhibited at inserting nucleotides opposite DNA lesions, shows less of a dependence upon W-C hydrogen bonding than does Polη. We find that an isosteric thymidine analog is replicated with low efficiency by Polκ, whereas a nucleobase analog lacking minor-groove H bonding potential is replicated with high efficiency. These observations suggest that both Polη and Polκ rely on W-C hydrogen bonding for localizing the nascent base pair in the active site for the polymerization reaction to occur, thus overcoming these enzymes' low geometric selectivity.
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