Construction of RNA nanotubes

Area of Science:

• Biotechnology
• Materials Science
• Nanotechnology

Background:

• Carbon nanotubes offer precise width control but lack precise length control for nanomanufacturing.
• Developing methods for controlled nanotube assembly is crucial for advancing nanotechnological applications.

Purpose of the Study:

• To report two novel one-pot self-assembly approaches for fabricating RNA nanotubes.
• To investigate the potential of RNA nanotubes for single-molecule sensing applications.

Main Methods:

• Designed six-RNA strand systems for self-assembly into hollow nanotubes via complementary base pairing.
• Characterized RNA nanotubes using gel electrophoresis and atomic force microscopy (AFM).
• Incorporated cholesterol into RNA nanotubes and tested their interaction with lipid bilayers for sensing.

Main Results:

• Successfully fabricated RNA nanotubes with controlled dimensions (11 nm length, 1.7 nm inner diameter, 6.3 nm outer diameter).
• Demonstrated discrete current signatures upon interaction with lipid bilayers and peptide molecules.
• Showed that RNA-cholesterol complexes can detect polyarginine peptides of varying lengths via current blockage.

Conclusions:

• The developed methods enable precise length control in RNA nanotube fabrication.
• RNA-cholesterol complexes show significant promise for single-molecule sensing of peptides.
• RNA nanotubes represent a versatile platform for future nanotechnological and biosensing applications.