Cell Membrane Targeting via Spacer Length-Engineered Amphiphilic DNA Frameworks

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• Cell membrane-anchored DNA nanostructures are crucial for cellular sensing and engineering.
• Their efficiency is often hindered by mechanical incompatibility between rigid DNA and dynamic cell membranes.

Purpose of the Study:

• To investigate how structural flexibility, controlled by spacer length, impacts the membrane-targeting efficiency of DNA nanostructures.
• To optimize DNA nanostructures for enhanced cell membrane interaction.

Main Methods:

• Systematic insertion of poly(thymine) spacers of varying lengths into amphiphilic tetrahedral DNA frameworks (TDFs).
• Quantitative fluorescence analysis and live-cell confocal imaging to assess membrane targeting.
• Time-course analysis to evaluate the dynamics of membrane association.

Main Results:

• Spacer length significantly influences membrane targeting efficiency; moderate lengths improve performance.
• TDFs with a 10-thymine spacer showed a ~6-fold increase in membrane targeting signal compared to spacer-free designs.
• Spacer engineering impacts the rate of membrane targeting, with the 10T construct demonstrating the fastest signal accumulation.

Conclusions:

• Spacer engineering is a key factor in determining the membrane-targeting capability of DNA nanostructures.
• This study provides a design strategy to enhance the performance of DNA-based cell membrane probes and tools.