Selective Detection and Characterization of Small Cysteine-Containing Peptides with Cluster-Modified Nanopore Sensing

Madhav L. Ghimire, Bobby D. Cox, Cole A. Winn, Thomas W. Rockett, Nicholas P. Schifano, Hannah M. Slagle, Frank Gonzalez, Massimo F. Bertino, Gregory A. Caputo, Joseph E. Reiner

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

It was recently demonstrated that one can monitor ligand-induced structure fluctuations of individual thiolate-capped gold nanoclusters using resistive-pulse nanopore sensing. The magnitude of the fluctuations scales with the size of the capping ligand, and it was later shown one can observe ligand exchange in this nanopore setup. We expand on these results by exploring the different types of current fluctuations associated with peptide ligands attaching to tiopronin-capped gold nanoclusters. We show here that the fluctuations can be used to identify the attaching peptide through either the magnitude of the peptide-induced current jumps or the onset of high-frequency current fluctuations. Importantly, the peptide attachment process requires that the peptide contains a cysteine residue. This suggests that nanopore-based monitoring of peptide attachments with thiolate-capped clusters could provide a means for selective detection of cysteine-containing peptides. Finally, we demonstrate the cluster-based protocol with various peptide mixtures to show that one can identify more than one cysteine-containing peptide in a mixture.

Original languageEnglish (US)
Pages (from-to)17229-17241
Number of pages13
JournalACS Nano
Volume16
Issue number10
DOIs
StatePublished - Oct 25 2022

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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