Programmable DNA Origami Nanodevice Reveals Force-Dependent Protein Interactions

Key Takeaways

• 5‑9 pN forces mimic physiological cellular tension
• Bulk pull‑down assays detect force‑dependent binding
• Vinculin recruitment rises up to sixfold under load
• Filamin A/B identified as new talin tension partners
• Device produces millions of copies, customizable for any protein

Summary

Yale researchers have engineered a DNA‑origami nanodevice equipped with programmable hairpin springs that apply 5–9 pN tension to target proteins. The platform generates millions of identical units, enabling bulk pull‑down assays and mass‑spectrometry identification of force‑dependent binding partners. Using the talin1 R1‑R2 segment, the device doubled protein extension and boosted vinculin recruitment up to sixfold. An unbiased proteomic screen further uncovered direct, tension‑induced interactions between talin and filamin A/B, proteins not previously linked in this context.

Pulse Analysis

Mechanotransduction governs cell adhesion, migration, and tissue remodeling, yet traditional force‑spectroscopy tools—atomic‑force microscopes or magnetic tweezers—operate one molecule at a time, limiting biochemical throughput. By marrying DNA origami scaffolds with tunable hairpin springs, the Yale team bridges this gap, delivering piconewton‑scale tension in a format compatible with standard bulk assays. This convergence of nanotechnology and proteomics opens a pathway for systematic exploration of how mechanical cues reshape protein interaction networks, a frontier previously accessible only through labor‑intensive single‑molecule studies.

The nanodevice’s U‑shaped frame clamps a protein between two DNA handles; a displacement strand triggers hairpin folding, generating a calibrated 5–9 pN pull that mimics intracellular forces on talin. Validation with a fluorescence‑based tension sensor confirmed the expected force magnitude, while electron microscopy showed ~74 % correctly assembled complexes. When the talin R1‑R2 segment was tensioned, vinculin binding surged sixfold, and a dual‑spring variant doubled both extension and recruitment, establishing a clear quantitative link between mechanical stretch and partner affinity.

Beyond talin, the platform’s modularity promises rapid adaptation to any mechanosensitive protein, from ion channels to extracellular matrix receptors. Scaling the frame size, adding parallel springs, or integrating alternative tether chemistries could push forces beyond 20 pN, expanding the searchable landscape of force‑regulated interactions. For biotech and pharmaceutical pipelines, this translates into high‑throughput screens for novel therapeutic targets implicated in cancer, fibrosis, and cardiovascular disease, where aberrant mechanosensing drives pathology. The ability to interrogate millions of protein copies under defined tension positions DNA‑origami nanodevices as a cornerstone technology for next‑generation mechanobiology research.