Reversible Binding of DNA to Mica for AFM Imaging

Additional resources and features associated with this article are available within the HTML version: • Supporting Information • Links to the 1 articles that cite this article, as of the time of this article download • Access to high resolution figures • Links to articles and content related to this article • Copyright permission to reproduce figures and/or text from this article Controlling DNA adsorption to atomically flat surfaces is crucial for studying protein-DNA interactions with the atomic force microscope (AFM). We present a method that enables reversible binding of this molecule to mica during AFM imaging in liquids. This can be acheived using a flow-through system which allows the exchange of different buffers that promote and inhibit the DNA adhesion to the surface. The DNA adsorption is controlled primarily through the divalent cation concentration. The DNA visibility in the AFM was investigated as a function of pH and cation concentration.