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Designed alpha-helical barrels for charge-selective peptide translocation.

Smrithi Krishnan R1,2, Neethu Puthumadathil1,2, Amina H Shaji1

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Researchers developed synthetic alpha-helix pores (pPorA) for selective peptide sensing. These tunable pores enable single-molecule detection and analysis of charged peptides, advancing nanopore proteomics.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Biophysics

Background:

  • Synthetic alpha-helix based pores for selective peptide sensing remain largely uncharacterized.
  • Developing artificial pores with tunable properties is crucial for advanced molecular sensing applications.

Purpose of the Study:

  • To report the characterization of large transmembrane pores (pPorA) formed from synthetic alpha-helical peptides.
  • To investigate the tunable conductance and selectivity of these synthetic pores for single-molecule peptide sensing.
  • To elucidate the molecular and electrostatic basis of peptide translocation through synthetic nanopores.

Main Methods:

  • Quantified selective translocation kinetics of cationic and anionic peptides through synthetic pores at single-molecule resolution.
  • Utilized electrophoretic force to pull charged peptides into pores, analyzing dissociation rates.
  • Performed salt and pH-dependent measurements to confirm electrostatic interactions and charge selectivity.
  • Elucidated pore lumen charge patterns and membrane orientation via binding kinetics asymmetry.

Main Results:

  • Demonstrated tunable conductance and selectivity in synthetic alpha-helix based pores (pPorA).
  • Successfully quantified selective translocation kinetics for differently charged peptides at the single-molecule level.
  • Established the molecular and electrostatic basis for peptide translocation by tuning pore selectivity.
  • Confirmed electrostatic dominance and charge selectivity in peptide-pore interactions through various measurements.

Conclusions:

  • Synthetic pores (pPorA) offer tunable conductance and selectivity for single-molecule peptide sensing.
  • These pores provide insights into the molecular and electrostatic mechanisms governing peptide translocation.
  • pPorA are advantageous for nanopore proteomics analysis and synthetic nanobiotechnology applications.