Competing interactions in DNA assembly on graphene.

Competing interactions in DNA assembly on graphene.
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DOI:
10.1371/journal.pone.0018442
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发表时间:
2011-04-12
期刊:
影响因子:
3.7
通讯作者:
Postma HW
Postma HW
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Akca S;Foroughi A;Frochtzwajg D;Postma HW

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我们研究了单链 DNA 短链在石墨顶部石墨烯表面形成的模式。我们发现 DNA 组装成两种不同的模式:小球形颗粒和细长的网络。基于 DNA-石墨烯结合、疏水相互作用的已知相互作用模型或基于碱基的嘌呤/嘧啶性质的模型并不能解释我们观察到的模式形成中的交叉。我们认为观察到的组装行为是由基础 pi 堆叠和基础石墨烯 pi 堆叠之间的竞争交叉引起的,并且我们推断出 eV 的临界交叉能量。因此,这些实验提供了碱基相互作用强度的投影测量。
We study the patterns that short strands of single-stranded DNA form on the top graphene surface of graphite. We find that the DNA assembles into two distinct patterns, small spherical particles and elongated networks. Known interaction models based on DNA-graphene binding, hydrophobic interactions, or models based on the purine/pyrimidine nature of the bases do not explain our observed crossover in pattern formation. We argue that the observed assembly behavior is caused by a crossover in the competition between base-base pi stacking and base-graphene pi stacking and we infer a critical crossover energy of eV. The experiments therefore provide a projective measurement of the base-base interaction strength.
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