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Updated: Oct 5, 2025
Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
Published on: August 27, 2014
Next generation single-molecule techniques: Imaging, labeling, and manipulation in vitro and in cellulo
Taekjip Ha1, Christian Kaiser2, Sua Myong3
1Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA; Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA; Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA; Howard Hughes Medical Institute, Baltimore, MD 21205, USA.
Single-molecule techniques offer unprecedented insights into biological processes by enabling manipulation, labeling, and imaging of individual molecules. These advanced methods reveal molecular interactions, cellular dynamics, and gene expression regulation with remarkable precision.
Area of Science:
- Biophysics
- Molecular Biology
- Cell Biology
Background:
- Single-molecule techniques provide unparalleled resolution for studying biological mechanisms.
- Traditional methods often average molecular behavior, masking crucial individual events.
Purpose of the Study:
- To highlight the diverse applications of single-molecule techniques in modern biological research.
- To showcase how these methods advance our understanding of molecular interactions and cellular processes.
Main Methods:
- Single-molecule fluorescence resonance energy transfer (smFRET) for conformational analysis.
- Single-molecule pull-down (SiMPull) for protein complex characterization.
- Single-molecule tracking (SMT) for live-cell dynamics.
- Optical tweezers and force spectroscopy for molecular manipulation.
Main Results:
- Imaging techniques reveal molecular interactions and conformational changes.
- Labeling methods uncover chromosome organization and gene expression dynamics.
- Manipulation tools elucidate mechanisms of protein folding and receptor function.
Conclusions:
- Single-molecule approaches grant access to elementary biological processes.
- These techniques are transforming mechanistic understanding across diverse biological fields.
- Future applications promise deeper insights into complex cellular functions.
