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Threading synthetic polyelectrolytes through protein pores.

Ryan J Murphy1, M Muthukumar

  • 1Polymer Science and Engineering Department, University of Massachusetts, Amherst, Massachusetts 01003, USA.

The Journal of Chemical Physics
|February 17, 2007
PubMed
Summary

Researchers measured ionic current changes as single sodium poly(styrene sulfonate) molecules moved through a protein pore. This study reveals distinct translocation dynamics compared to DNA and RNA, offering new methods for polymer analysis.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Polymer Science

Background:

  • Single-molecule translocation through nanopores is a key technique for analyzing polymers like DNA and RNA.
  • Understanding synthetic polymer behavior in nanopores is crucial for developing new analytical and separation methods.

Purpose of the Study:

  • To investigate the translocation dynamics of synthetic polyelectrolytes, specifically sodium poly(styrene sulfonate), through a single alpha-hemolysin pore.
  • To compare the translocation characteristics of synthetic polymers with those of biological polymers (DNA and RNA).

Main Methods:

  • Single-molecule translocation experiments using an alpha-hemolysin pore in a lipid bilayer.
  • Measurement of ionic current blockades caused by polymer translocation in an aqueous electrolyte solution under an applied electric field.
  • Statistical analysis of thousands of translocation events to generate distribution functions for current reduction and translocation time.

Main Results:

  • Translocation of sodium poly(styrene sulfonate) significantly reduced ionic current through the alpha-hemolysin pore.
  • Distribution functions for current reduction magnitude and translocation duration differed substantially from those observed for DNA and RNA.
  • Average translocation time scaled proportionally with polymer molecular weight and inversely with applied voltage over two orders of magnitude.

Conclusions:

  • Synthetic polyelectrolytes can be threaded through biological nanopores, providing a versatile platform for studying macromolecular translocation.
  • The distinct translocation dynamics of synthetic polymers suggest potential for novel polymer separation techniques in aqueous media.
  • This work facilitates fundamental physics exploration of macromolecular translocation using diverse synthetic polymers.