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Designed, Helical Protein Nanotubes with Variable Diameters from a Single Building Block.

Jeffrey D Brodin1, Sarah J Smith1, Jessica R Carr1

  • 1Department of Chemistry & Biochemistry, UCSD , 9500 Gilman Drive, La Jolla, California 92093, United States.

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Researchers designed a protein building block, Zn8R4, that self-assembles into tunable, crystalline protein nanotubes. These flexible helical structures offer new possibilities for biomolecular engineering and materials science.

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Area of Science:

  • Biomolecular Engineering
  • Protein Design
  • Materials Science

Background:

  • 1D helical protein assemblies are attractive for biomolecular engineering due to their unique structural and mechanical properties.
  • Designing self-assembling protein structures is a key goal in protein design.

Purpose of the Study:

  • To present a designed protein building block, Zn8R4, capable of forming helical nanotubes.
  • To investigate the assembly, structure, and mechanical properties of these protein nanotubes.

Main Methods:

  • Protein design and synthesis of the Zn8R4 tetrameric building block.
  • Induction of self-assembly via zinc coordination interactions.
  • Characterization using X-ray crystallography and transmission electron microscopy (TEM).
  • Mechanical property assessment correlated with nanotube width.

Main Results:

  • Zn8R4 self-assembles into crystalline, helical nanotubes with controllable widths.
  • All nanotube types share a common 2D arrangement of Zn8R4 tetramers linked by zinc coordination.
  • Nanotube flexibility is maintained despite crystalline order due to minimal inter-subunit interactions.

Conclusions:

  • The designed Zn8R4 protein efficiently forms tunable, crystalline helical nanotubes.
  • Metal coordination is a viable strategy for controlling protein assembly and nanotube properties.
  • These protein nanotubes exhibit high flexibility, making them promising for biomolecular engineering applications.