Force measurements on single molecular contacts through evanescent wave microscopy |
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Authors: | Zocchi G |
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Institution: | Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA. zocchi@physics.ucla.edu |
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Abstract: | We introduce a new method to apply controlled forces on single molecules. The motion of a micron-sized bead attached to a solid surface through a single molecular contact is tracked by evanescent wave microscopy as a force is exerted through a flow. We report measurements of the streptavidin-biotin bond rupture force obtained with this technique. We also obtain detailed measurements of the balance of forces involved in detaching an adhering bead with a flow. A small lateral force translates into a much bigger normal force on the attachment point. This effect is relevant for the interpretation of common cell adhesion assays. |
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