DNA Origami - Lipid Membrane Interactions Controlled by Nanoscale Sterics

Area of Science:

• Biotechnology
• Nanotechnology
• Synthetic Biology

Background:

• DNA nanostructures are crucial for mimicking biological systems and have applications in biosensing.
• Understanding DNA-membrane interactions is limited, especially concerning steric effects from 3D structures.
• Current research lacks insight into how DNA nanostructure geometry influences membrane association.

Purpose of the Study:

• To investigate how steric effects of 3D DNA nanostructures impact their interaction with membrane vesicles.
• To elucidate the role of vesicle size and local bilayer morphology in DNA-membrane interactions.
• To explore the design principles for DNA nanodevices interacting with lipid bilayers.

Main Methods:

• Utilized a 3D DNA nanostructure with membrane anchors in varied steric environments.
• Studied interactions with membrane vesicles of different sizes and local bilayer morphologies.
• Analyzed the influence of anchor accessibility and non-lipidated DNA regions on interactions.

Main Results:

• Steric environments of DNA anchors significantly affect membrane interactions, often contrary to accessibility predictions.
• Local nanoscale bilayer morphology plays a more critical role than global vesicle size.
• Weak contacts with non-lipidated DNA regions co-control anchor-mediated bilayer interactions, enabling vesicle size discrimination.

Conclusions:

• DNA nanostructure geometry and local membrane morphology are key factors in DNA-membrane interactions.
• This work advances DNA nanotechnology for controlled bilayer interactions.
• Findings facilitate the development of nanodevices for vesicle-based diagnostics and synthetic cells.