Synthetic lipid membrane channels formed by designed DNA nanostructures.

Synthetic lipid membrane channels formed by designed DNA nanostructures.
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DOI:
10.1126/science.1225624
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发表时间:
2012-11-16
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Simmel FC
Simmel FC
中科院分区:
其他
文献类型:
--
作者:
Langecker M;Arnaut V;Martin TG;List J;Renner S;Mayer M;Dietz H;Simmel FC

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We created nanometer-scale transmembrane channels in lipid bilayers using self-assembled DNA-based nanostructures. Scaffolded DNA origami was used to create a stem that penetrates and spans a lipid membrane, and a barrel-shaped cap that adheres to the membrane in part via 26 cholesterol moieties. In single-channel electrophysiological measurements, we find similarities to the response of natural ion channels, such as conductances on the order of 1 nS and channel gating. More pronounced gating was seen for mutations in which a single DNA strand of the stem protruded into the channel. In single-molecule translocation experiments, we highlight one of many potential applications of the synthetic channels, namely as single DNA molecule sensing devices.
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