Penn Medicine
   
 

Yale Goldman, M.D., Ph.D.

Park, J.H., Sun, Y., Goldman, Y.E., and Composto, R.J.

Self-Assembled Charged Hydrogels Control the Alignment of Filamentous Actin.

Soft Matter, In Press, 2010.

We demonstrate a novel route to control attachment of filamentous actin (F-actin) on hydrogel films. By incorporating an amine-terminated silane, the hydrogel surface charge and surface topography are varied. With increasing silane content, F-actin reorients from perpendicular to parallel to the hydrogel surface, ceases to wobble, and forms mainly elongated or cyclic structures. F-Actin coverage reaches a maximum at 2.5 vol% silane and declines at higher silane content. This biphasic behavior is explained by the simultaneous increase in surface charge and the self-assembly of a micron scale pattern of positively charged islands. Our approach provides guidelines for constructing nanoscale tracks to guide motor proteins underlying nano-engineered devices such as molecular shuttles.

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