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Monitoring Protein Adsorption with Solid-state Nanopores
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Differentiation of selectively labeled peptides using solid-state nanopores.

Jae-Seok Yu1, Seong Cheol Hong, Sangwook Wu

  • 1Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.

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|January 24, 2019
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Summary

Solid-state nanopores can distinguish peptides with varying cysteine residues when labeled. This targeted labeling strategy offers a new method for peptide and protein identification.

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Area of Science:

  • Biochemistry
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Protein amino acid sequencing is vital for understanding biological processes.
  • Mass spectrometry is a common tool for protein identification but has sensitivity limits for low-abundance proteins.

Purpose of the Study:

  • To differentiate between three similar peptide sequences with varying cysteine residue locations using solid-state nanopores.
  • To investigate the effectiveness of a targeted labeling strategy for enhancing peptide discrimination.

Main Methods:

  • Utilized solid-state nanopores to analyze peptides differing in cysteine residue placement.
  • Labeled cysteine residues with Flamma® 496, a negatively charged molecule.
  • Analyzed nanopore signals, including current blockades, peak shapes, and full width at half-maximum, under varying voltages.

Main Results:

  • Direct nanopore analysis struggled to differentiate the peptides based on cysteine location alone.
  • Labeling cysteine residues with Flamma® 496 generated distinct nanopore signals for each peptide.
  • Differences in relative current blockade and signal peak characteristics enabled successful peptide discrimination.

Conclusions:

  • Solid-state nanopores combined with targeted labeling can create unique peptide signatures.
  • This approach shows potential for improved protein identification, especially for low-abundance samples.