Research highlights: nanopore protein detection and analysis

Area of Science:

• Biophysics
• Nanotechnology
• Biochemistry

Background:

• Nanopores are highly sensitive single-molecule sensors suitable for rapid characterization of various analytes.
• While extensively used for nucleic acids, protein analysis presents greater challenges due to proteins' diverse characteristics (size, structure, charge).

Purpose of the Study:

• To review recent advancements in using nanopore technology for protein detection and characterization.
• To highlight novel methods for sensitive and quantitative protein analysis using nanopores.

Main Methods:

• Detection of proteins in solution by coupling them to carrier DNA for electrophoretic transport through nanopores.
• Quantification of protein binding to aptamers for nanopore-based detection.
• Studying protein secondary structure and folding energetics using protein nanopores and unfoldase enzymes.

Main Results:

• Successful detection of specific protein species in solution.
• Achieved quantitative nanopore detection of proteins and other analytes binding to aptamers down to picomolar concentrations.
• Demonstrated the ability to detect the impact of single amino acid mutations on protein stability.

Conclusions:

• Nanopore technology is a versatile tool for protein detection, offering insights into enzymatic activity, ligand binding, and secondary structure.
• Emerging nanopore techniques provide sensitive and quantitative methods for protein analysis, complementing existing approaches.