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Simultaneous, coincident optical trapping and single-molecule fluorescence

Simultaneous, coincident optical trapping and single-molecule fluorescence We constructed a microscope-based instrument capable of simultaneous, spatially coincident optical trapping and single-molecule fluorescence. The capabilities of this apparatus were demonstrated by studying the force-induced strand separation of a dye-labeled, 15-base-pair region of double-stranded DNA (dsDNA), with force applied either parallel ('unzipping' mode) or perpendicular ('shearing' mode) to the long axis of the region. Mechanical transitions corresponding to DNA hybrid rupture occurred simultaneously with discontinuous changes in the fluorescence emission. The rupture force was strongly dependent on the direction of applied force, indicating the existence of distinct unbinding pathways for the two force-loading modes. From the rupture force histograms, we determined the distance to the thermodynamic transition state and the thermal off rates in the absence of load for both processes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Methods Springer Journals

Simultaneous, coincident optical trapping and single-molecule fluorescence

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References (46)

Publisher
Springer Journals
Copyright
Copyright © 2004 by Nature Publishing Group
Subject
Life Sciences; Life Sciences, general; Biological Techniques; Biological Microscopy; Biomedical Engineering/Biotechnology; Bioinformatics; Proteomics
ISSN
1548-7091
eISSN
1548-7105
DOI
10.1038/nmeth714
Publisher site
See Article on Publisher Site

Abstract

We constructed a microscope-based instrument capable of simultaneous, spatially coincident optical trapping and single-molecule fluorescence. The capabilities of this apparatus were demonstrated by studying the force-induced strand separation of a dye-labeled, 15-base-pair region of double-stranded DNA (dsDNA), with force applied either parallel ('unzipping' mode) or perpendicular ('shearing' mode) to the long axis of the region. Mechanical transitions corresponding to DNA hybrid rupture occurred simultaneously with discontinuous changes in the fluorescence emission. The rupture force was strongly dependent on the direction of applied force, indicating the existence of distinct unbinding pathways for the two force-loading modes. From the rupture force histograms, we determined the distance to the thermodynamic transition state and the thermal off rates in the absence of load for both processes.

Journal

Nature MethodsSpringer Journals

Published: Oct 21, 2004

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