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Science 323 (5914): 638-641

Copyright © 2009 by the American Association for the Advancement of Science

Stretching Single Talin Rod Molecules Activates Vinculin Binding

Armando del Rio,1 Raul Perez-Jimenez,1 Ruchuan Liu,2 Pere Roca-Cusachs,1 Julio M. Fernandez,1 Michael P. Sheetz1*

Abstract: The molecular mechanism by which a mechanical stimulus is translated into a chemical response in biological systems is still unclear. We show that mechanical stretching of single cytoplasmic proteins can activate binding of other molecules. We used magnetic tweezers, total internal reflection fluorescence, and atomic force microscopy to investigate the effect of force on the interaction between talin, a protein that links liganded membrane integrins to the cytoskeleton, and vinculin, a focal adhesion protein that is activated by talin binding, leading to reorganization of the cytoskeleton. Application of physiologically relevant forces caused stretching of single talin rods that exposed cryptic binding sites for vinculin. Thus in the talin-vinculin system, molecular mechanotransduction can occur by protein binding after exposure of buried binding sites in the talin-vinculin system. Such protein stretching may be a more general mechanism for force transduction.

1 Department of Biological Sciences, Columbia University, New York, NY 10027, USA.
2 Department of Physics, National University of Singapore, Singapore 117542, Singapore.

* To whom correspondence should be addressed. E-mail: ms2001{at}

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