Observing Single-Molecule Dynamics at Millimolar Concentrations.

Observing Single-Molecule Dynamics at Millimolar Concentrations.
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DOI:
10.1002/anie.201612050
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发表时间:
2017-02-20
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Goldsmith RH
Goldsmith RH
中科院分区:
其他
文献类型:
--
作者:
Goldschen-Ohm MP;White DS;Klenchin VA;Chanda B;Goldsmith RH

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Single-molecule fluorescence microscopy is a powerful tool for revealing chemical dynamics and molecular association mechanisms, but was limited to low concentrations of fluorescent species only suitable for studying high affinity reactions. Here, we combine nanophotonic zero-mode waveguides (ZMW) with fluorescence resonance energy transfer (FRET) to resolve single-molecule association dynamics at up to millimolar concentrations of fluorescent species. This approach extends resolution of molecular dynamics to >100-fold higher concentrations, enabling observations at concentrations relevant to biological and chemical processes, and thus making single-molecule techniques applicable to a tremendous range of previously inaccessible molecular targets. We deploy this approach to show binding of cGMP to pacemaking ion channels is weakened by a slower internal conformational change. Single-molecule resolution of association dynamics at millimolar concentrations of fluorescent ligands (>100-fold higher concentrations than previously accessible) with Zero-mode waveguides and FRET.
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