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Updated: Apr 15, 2026

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Profiling the Structural Heterogeneity of Monomeric α-Synuclein From the Single-Molecule Level Using MspA Nanopores.

Xiaoya Zhang1, Xinpei Wang1, Yue Zhang1

  • 1Research and Innovation Center, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, Human Phenome Institute, Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai, China.

Angewandte Chemie (International Ed. in English)
|April 14, 2026
PubMed
Summary

Researchers developed a new single-molecule method using MspA nanopores to analyze alpha-synuclein (αSyn) monomer structure. This technique reveals distinct structural states, aiding the study of Parkinson's disease protein misfolding.

Keywords:
MspAnanoporesingle‐moleculestructureα‐Synuclein

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Area of Science:

  • Biophysics
  • Structural Biology
  • Nanotechnology

Background:

  • Parkinson's disease (PD) is linked to alpha-synuclein (αSyn) protein misfolding.
  • Elucidating the structure of monomeric αSyn is crucial for understanding PD pathogenesis but remains challenging.

Purpose of the Study:

  • To develop and validate a novel single-molecule technique for analyzing monomeric αSyn structure.
  • To investigate the structural heterogeneity of αSyn monomers using nanopore analysis.

Main Methods:

  • Utilized Mycobacterium smegmatis porin A (MspA) nanopores for single-molecule analysis of αSyn.
  • Employed systematic measurements of αSyn fragments and reference peptides.
  • Integrated molecular dynamics simulations to interpret nanopore signals.

Main Results:

  • Identified three distinct, reproducible current levels in nanopore signals corresponding to αSyn monomer.
  • Demonstrated that these current levels represent α-helical and random-coil structures within αSyn.
  • Successfully assigned α-helical structures to specific αSyn subdomains and profiled structural heterogeneity.

Conclusions:

  • MspA nanopores can directly detect α-helical structures in individual αSyn monomers.
  • This technique enhances the investigation of flexible, pathological proteins like αSyn.
  • The findings contribute to understanding the misfolding mechanisms underlying Parkinson's disease.