Title | High-speed AFM height spectroscopy reveals µs-dynamics of unlabeled biomolecules. |
Publication Type | Journal Article |
Year of Publication | 2018 |
Authors | Heath GR, Scheuring S |
Journal | Nat Commun |
Volume | 9 |
Issue | 1 |
Pagination | 4983 |
Date Published | 2018 Nov 26 |
ISSN | 2041-1723 |
Abstract | Dynamics are fundamental to the functions of biomolecules and can occur on a wide range of time and length scales. Here we develop and apply high-speed AFM height spectroscopy (HS-AFM-HS), a technique whereby we monitor the sensing of a HS-AFM tip at a fixed position to directly detect the motions of unlabeled molecules underneath. This gives Angstrom spatial and microsecond temporal resolutions. In conjunction with HS-AFM imaging modes to precisely locate areas of interest, HS-AFM-HS measures simultaneously surface concentrations, diffusion coefficients and oligomer sizes of annexin-V on model membranes to decipher key kinetics allowing us to describe the entire annexin-V membrane-association and self-assembly process in great detail and quantitatively. This work displays how HS-AFM-HS can assess the dynamics of unlabeled bio-molecules over several orders of magnitude and separate the various dynamic components spatiotemporally. |
DOI | 10.1038/s41467-018-07512-3 |
Alternate Journal | Nat Commun |
PubMed ID | 30478320 |