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Related Experiment Videos

Functional subconformations in protein folding: evidence from single-channel experiments.

Lisen Kullman1, Philip A Gurnev, Mathias Winterhalter

  • 1Laboratory of Physical and Structural Biology, NICHD, NIH, Bethesda, Maryland 20892-0924, USA.

Physical Review Letters
|February 21, 2006
PubMed
Summary

Single-molecule studies reveal Maltoporin (sugar channel) exhibits distinct subconformations. Ion conductance varies due to protein folding disorder, but sugar binding remains unaffected, showing functional diversity.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Membrane Protein Research

Background:

  • Maltoporin is a crucial sugar-specific channel-forming membrane protein.
  • Understanding single-molecule behavior is key to elucidating protein function.
  • Variations in protein parameters can arise from inherent structural disorder.

Purpose of the Study:

  • To investigate single-molecule fluctuations in Maltoporin's ion conductance and enzymatic rates.
  • To analyze time-persistent deviations in individual channel transport parameters.
  • To correlate these variations with static disorder in protein folding.

Main Methods:

  • Single-molecule biophysical measurements.
  • Analysis of ion conductance fluctuations.

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  • Enzymatic rate assays.
  • Time-series analysis of transport parameters.

    • Main Results:

    • Identified significant time-persistent deviations in ion conductance and enzymatic rates at the single-molecule level.
    • Demonstrated that protein folding disorder causes variations in ion conductance.
    • Showed that sugar binding affinity is independent of the disorder affecting ion conductance.

    Conclusions:

    • Maltoporin exhibits a range of functional subconformations due to static disorder.
    • The channel can maintain sugar transport functionality despite variations in ion conductance.
    • Protein disorder influences specific functional aspects (ion conductance) without compromising others (sugar binding).