Molecular recognition force spectroscopy study of the dynamic interaction between aptamer GBI‐10 and extracellular matrix protein tenascin‐C on human glioblastoma cell

Molecular recognition force spectroscopy (MR‐FS) was applied to investigate the dynamic interaction between aptamer GBI‐10 and tenascin‐C (TN‐C) on human glioblastoma cell surface at single‐molecule level. The unbinding force between aptamer GBI‐10 and TN‐C was 39 pN at the loading rate of 0.3 nN sec −1 . A series of kinetic parameters concerning interaction process such as the unbinding force f u , the association rate constant k on , dissociation rate constant at zero force k off , and dissociation constant K D for aptamer GBI‐10/TN‐C complexes were acquired. In addition, the interaction of aptamer GBI‐10 with TN‐C depended on the presence of Mg 2+ . This work demonstrates that MR‐FS can be used as an attractive tool for exploring the interaction forces and dynamic process of aptamer and ligand at the single‐molecule level. As a future perspective, MR‐FS may be used as a potential diagnostic and therapeutic tool by combining with other techniques. Copyright © 2012 John Wiley & Sons, Ltd.