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Related Experiment Videos

pH-Switchable strand orientation in peptide assemblies.

Nathan A Schnarr1, Alan J Kennan

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.

Organic Letters
|January 28, 2005
PubMed
Summary

Researchers designed novel antiparallel coiled-coil heterotrimers with mismatched interfaces. These structures enable pH-triggered switching between parallel and antiparallel configurations, offering new possibilities in protein design.

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Area of Science:

  • Protein engineering
  • Biophysical chemistry
  • Structural biology

Background:

  • Coiled-coils are common protein structures.
  • Antiparallel arrangements are less common and harder to design than parallel ones.
  • Electrostatic interactions play a key role in protein folding and stability.

Purpose of the Study:

  • To design and characterize novel antiparallel coiled-coil heterotrimers.
  • To investigate the role of mismatched electrostatic interfaces in controlling coiled-coil structure.
  • To demonstrate pH-triggered switching between parallel and antiparallel coiled-coil complexes.

Main Methods:

  • Computational design of protein sequences.
  • Synthesis and purification of designed peptides.

Related Experiment Videos

  • Characterization of complex formation and stability using biophysical techniques (e.g., circular dichroism, analytical ultracentrifugation).
  • pH-dependent structural analysis.

    • Main Results:

    • Successfully designed and synthesized antiparallel coiled-coil heterotrimers with singly mismatched electrostatic interfaces.
    • The designed complexes exhibited properties consistent with well-formed coiled-coils.
    • Stabilities were comparable to parallel coiled-coil analogues.
    • Demonstrated pH-triggered strand exchange, enabling switching from parallel to antiparallel configurations.

    Conclusions:

    • Mismatched electrostatic interfaces are effective for designing stable antiparallel coiled-coil heterotrimers.
    • pH-triggered strand exchange provides a mechanism for controlling coiled-coil architecture.
    • This work expands the toolkit for designing complex protein structures with tunable properties.