Quantum transport anomalies in DNA containing mispairs

Quantum transport anomalies in DNA containing mispairs
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含有错配的 DNA 中的量子传输异常

DOI:
10.1088/0957-4484/21/48/485101
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发表时间:
2010-12
期刊:
影响因子:
3.5
通讯作者:
Berashevich, J.
Berashevich, J.
中科院分区:
材料科学3区
文献类型:
--
作者:
Wang, Xue-Feng;Chakraborty, Tapash;Berashevich, J.

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用紧束缚模型研究了错配对对连接在铂电极上的(GC)(TA)N(GC)3 DNA中电荷输运的影响。从从头算密度泛函结果的参数,我们计算的电流与偏置电压的DNA和没有错配和不同数量的(TA)碱基对N之间的单和三重(GC)碱基对。当多通道输运机制建立时,电流在低偏压下随N指数衰减,但在高偏压下达到最小值。一个(GA)错配取代(TA)N序列的中间附近的(TA)碱基对通常会提高电流一个订单,由于其低电离能,但可能会降低电流显着时,建立多通道机制被打破。
The effect of mispairs on charge transport in DNA of sequence (GC)(TA)N(GC)3 connected to platinum electrodes is studied using the tight-binding model. With parameters derived from an ab initio density functional result, we calculate the current versus bias voltage for DNA with and without a mispair and for different numbers of (TA) basepairs N between the single and triple (GC) basepairs. The current decays exponentially with N under low bias but reaches a minimum under high bias when a multichannel transport mechanism is established. A (GA) mispair substituting a (TA) basepair near the middle of the (TA)N sequence usually enhances the current by one order due to its low ionization energy but may decrease the current significantly when an established multichannel mechanism is broken.
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