Abstract
The force curve mode of the atomic force microscope (AFM) was applied to extract intrinsic membrane proteins from the surface of live cells using AFM tips modified by amino reactive bifunctional covalent crosslinkers. The modified AFM tips were individually brought into brief contact with the living cell surface to form covalent bonds with cell surface molecules. The force curves recorded during the detachment process from the cell surface were often characterized by an extension of a few hundred nanometers followed mostly by a single step jump to the zero force level. Collection and analysis of the final rupture force revealed that the most frequent force values (of the force) were in the range of 0.4–0.6 nN. The observed rupture force most likely represented extraction events of intrinsic membrane proteins from the cell membrane because the rupture force of a covalent crosslinking system was expected to be significantly larger than 1.0 nN, and the separation force of noncovalent ligand-receptor pairs to be less than 0.2 nN, under similar experimental conditions. The transfer of cell surface proteins to the AFM tip was verified by recording characteristic force curves of protein stretching between the AFM tips used on the cell surface and a silicon surface modified with amino reactive bifunctional crosslinkers. This method will be a useful addition to bionanotechnological research for the application of AFM.
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Afrin, R., Arakawa, H., Osada, T. et al. Extraction of membrane proteins from a living cell surface using the atomic force microscope and covalent crosslinkers. Cell Biochem Biophys 39, 101–117 (2003). https://doi.org/10.1385/CBB:39:2:101
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DOI: https://doi.org/10.1385/CBB:39:2:101