Single-molecule diffusion and conformational dynamics by spatial integration of temporal fluctuations

Maged F. Serag, Maram Abadi, Satoshi Habuchi

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Single-molecule localization and tracking has been used to translate spatiotemporal information of individual molecules to map their diffusion behaviours. However, accurate analysis of diffusion behaviours and including other parameters, such as the conformation and size of molecules, remain as limitations to the method. Here, we report a method that addresses the limitations of existing single-molecular localization methods. The method is based on temporal tracking of the cumulative area occupied by molecules. These temporal fluctuations are tied to molecular size, rates of diffusion and conformational changes. By analysing fluorescent nanospheres and double-stranded DNA molecules of different lengths and topological forms, we demonstrate that our cumulative-area method surpasses the conventional single-molecule localization method in terms of the accuracy of determined diffusion coefficients. Furthermore, the cumulative-area method provides conformational relaxation times of structurally flexible chains along with diffusion coefficients, which together are relevant to work in a wide spectrum of scientific fields.
Original languageEnglish (US)
JournalNature Communications
Volume5
Issue number1
DOIs
StatePublished - Oct 6 2014

Fingerprint

Dive into the research topics of 'Single-molecule diffusion and conformational dynamics by spatial integration of temporal fluctuations'. Together they form a unique fingerprint.

Cite this