Label-free single-molecule detection of DNA-hybridization kinetics with a carbon nanotube field-effect transistor.
Label-free single-molecule detection of DNA-hybridization kinetics with a carbon nanotube field-effect transistor.
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DOI:
10.1038/nnano.2010.275
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发表时间:
2011-02
影响因子:
38.3
通讯作者:
中科院分区:
文献类型:
--
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Probing biomolecules at the single-molecule level can provide useful information about molecular interactions, kinetics and motions that is usually hidden in ensemble measurements. Techniques with improved sensitivity and time resolution are required to explore fast biomolecular dynamics. Here, we report the first observation of DNA hybridization at the single-molecule level using a carbon nanotube field-effect transistor. By covalently attaching a single-stranded probe DNA sequence to a point defect in a carbon nanotube, we are able to measure two-level fluctuations in the nanotube conductance due to reversible hybridizing and melting of a complementary DNA target. The kinetics are studied as a function of temperature, allowing the measurement of rate constants, melting curves and activation energies for different sequences and target concentrations. The kinetics show non-Arrhenius behavior, in agreement with DNA hybridization experiments using fluorescence correlation spectroscopy. This technique is label-free and has the potential for studying single-molecule dynamics at sub-microsecond time-scales.
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影响因子:
3.4
作者:
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通讯作者:
McKenzie, SE
影响因子:
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作者:
BORER, PN;DENGLER, B;UHLENBECK, OC
通讯作者:
UHLENBECK, OC
DOI:
10.1073/pnas.0908077106
发表时间:
2009-09-15
影响因子:
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Gonzalez, Ruben L., Jr.
DOI:
10.1073/pnas.0837064100
发表时间:
2003-04-29
影响因子:
11.1
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通讯作者:
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10.8
作者:
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通讯作者:
Collins, Philip G.