Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 21, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2023508118
Keywords
soft condensed matter; DNA nanotechnology; colloidal physics; microchemomechanical devices; self-assembly
Categories
Funding
- Center for BioInspired Energy Sciences, an Energy Frontier Research Center - US Department of Energy (DOE) , Office of Sciences, Basic Energy Sciences [DE-SC0000989]
- US DOE [DE-SC0007991]
- Materials Research Science and Engineering Centers program of the NSF [DMR-1420073]
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This study extends the programmability of DNA oligonucleotides to the micrometer-colloidal scale, utilizing optical microscopy and holographic optical tweezers for real-time observations. The research team has designed a chemomechanical device based on DNA origami structures, demonstrating high energy storage/retrieval capability and remote activation. This work paves the way for easily designed micromechanical devices bridging the molecular and colloidal/cellular scales.
The programmability of DNA oligonucleotides has led to sophisticated DNA nanotechnology and considerable research on DNA nanomachines powered by DNA hybridization. Here, we investigate an extension of this technology to the micrometer-colloidal scale, in which observations and measurements can be made in real time/space using optical microscopy and holographic optical tweezers. We use semirigid DNA origami structures, hinges with mechanical advantage, self-assembled into a nine-hinge, accordionlike chemomechanical device, with one end anchored to a substrate and a colloidal bead attached to the other end. Pulling the bead converts the mechanical energy into chemical energy stored by unzipping the DNA that bridges the hinge. Releasing the bead returns this energy in rapid (>20 mu m/s) motion of the bead. Forceextension curves yield energy storage/retrieval in these devices that is very high. We also demonstrate remote activation and sensing- pulling the bead enables binding at a distant site. This work opens the door to easily designed and constructed micromechanical devices that bridge the molecular and colloidal/cellular scales.
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