Sequencing proteins with transverse ionic transport in nanochannels

Area of Science:

• Biochemistry
• Molecular Biology
• Nanotechnology

Background:

• De novo protein sequencing is crucial for understanding cellular functions and post-translational modifications.
• Accurate protein sequences enable structure prediction, vital for modeling diseases like Alzheimer's.

Purpose of the Study:

• To develop a new technique for de novo protein sequencing.
• To assess the feasibility of using ionic current measurements in synthetic nanochannels for amino acid identification.

Main Methods:

• Translocating polypeptides through a synthetic nanochannel.
• Measuring the ionic current generated by individual amino acids as they pass through an intersecting nanochannel.

Main Results:

• The ionic current distributions for the 20 proteinogenic amino acids were found to be statistically distinct.
• This distinctiveness demonstrates the potential for identifying amino acids based on their ionic current signatures.

Conclusions:

• The proposed nanochannel-based technique offers a promising new approach for de novo protein sequencing.
• This method could significantly impact research in molecular biology, disease modeling, and drug discovery.