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Related Experiment Video

Updated: Mar 15, 2026

Analyzing and Building Nucleic Acid Structures with 3DNA

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

Single-molecule dissection of stacking forces in DNA.

Fabian Kilchherr¹, Christian Wachauf¹, Benjamin Pelz²

¹Labor für Biomolekulare Nanotechnologie, Physik Department and Walter Schottky Institute, Technische Universität München, Am Coulombwall 4a, Garching near Munich, Germany.

Science (New York, N.Y.)

|September 10, 2016

Summary

Researchers precisely measured DNA base-pair stacking forces and lifetimes for all sequences. This work advances understanding of DNA mechanics and aids in designing DNA-based nanoscale devices.

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Last Updated: Mar 15, 2026

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Published on: August 27, 2014

Area of Science:

Biophysics
Molecular Biology
Nanotechnology

Background:

DNA base-pair stacking is crucial for double helix stability.
Understanding stacking forces is key for DNA mechanics and nanotechnology applications.

Purpose of the Study:

To directly measure forces and lifetimes of DNA base-pair stacking interactions at the single-molecule level for all sequence combinations.
To provide kinetic data for designing DNA-based nanoscale devices.

Main Methods:

Utilized dual-beam optical tweezers and DNA origami to isolate and measure weak DNA stacking forces.
Experimentally determined spontaneous dissociation rates and forces along the helical direction.

Main Results:

Measured dissociation rates from 0.02 to 500 per second for various DNA stack sequences and sizes.
Identified stacking forces in the range of 2 to 8 piconewtons.
Estimated free-energy increments per stack from -0.8 to -3.4 kcal/mol.

Conclusions:

Provides fundamental insights into DNA base-pair stacking mechanics.
Offers crucial data for the rational design of DNA-based nanoscale devices with specific kinetic properties.