Quantum transport anomalies in DNA containing mispairs
Quantum transport anomalies in DNA containing mispairs
复制标题
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.
中科院分区:
文献类型:
--
作者:
Wang, Xue-Feng;Chakraborty, Tapash;Berashevich, J.
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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