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Measuring conductance switching in single proteins using quantum tunneling.

Longhua Tang1,2, Long Yi3, Tao Jiang1

  • 1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China.

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Researchers developed new tunneling probes to measure and control the electrical conductance of single proteins. This breakthrough allows for detailed study of protein properties and opens doors for bioelectronic applications.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Electronics

Background:

  • Interpreting single protein electrical signatures is key to understanding fundamental biological processes.
  • Ensemble and single-molecule methods often fail to capture this intrinsic protein information.
  • Fabricating nanoscale single-protein junctions is technically challenging.

Purpose of the Study:

  • To develop a method for fabricating and measuring single-protein junctions.
  • To actively control single-protein conductance using an external field in solution.
  • To investigate charge transport mechanisms in single proteins.

Main Methods:

  • Fabrication of specialized tunneling probes.
  • Direct measurement of single-protein conductance in solution.
  • Active control (switching) of protein conductance via an external electric field.
  • Bridging single streptavidin molecules between biotin-terminated electrodes.

Main Results:

  • Successful long-term measurement of single-protein tunneling response.
  • Demonstration of multiple conductive pathways in proteins.
  • Conductance pathways were found to be dependent on applied bias magnitude.
  • Active control of protein conductance was achieved.

Conclusions:

  • The developed probes enable reliable fabrication of protein-based electronic junctions.
  • This work facilitates a deeper understanding of protein electrical properties.
  • The findings pave the way for future protein-embedded bioelectronic devices.