Tip-enhanced Raman spectroscopy: plasmid-free vs. plasmid-embedded DNA

Area of Science:

• Biophysics
• Spectroscopy
• Molecular Biology

Background:

• Tip-enhanced Raman spectroscopy (TERS) offers high resolution for studying biomolecules like DNA and RNA.
• The influence of the nanoscale environment on DNA properties using TERS remains under-explored.

Purpose of the Study:

• To investigate the impact of the local nanoscale environment on DNA properties using TERS.
• To assess the sensitivity of TERS in detecting environmental influences on DNA.

Main Methods:

• Utilized gap-mode TERS as an ultra-sensitive, label-free technique.
• Achieved lateral spatial resolutions down to 8 nm under ambient conditions.
• Applied TERS to study the DNA of a β2-adrenergic receptor (β2AR) in relation to its local plasmid environment.

Main Results:

• Demonstrated TERS's capability to detect nanoscale environmental influences on DNA.
• Successfully mapped DNA properties with high spatial resolution.
• Identified the localization of nucleic acid bases within selected DNA regions.

Conclusions:

• TERS is a powerful tool for examining nanoscale environmental effects on DNA structure and properties.
• This technique enables detailed analysis of DNA at the nanoscale, including base localization.
• The study highlights TERS's potential for advancing our understanding of DNA in complex biological systems.