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Conformational transitions in model silk peptides.

D Wilson1, R Valluzzi, D Kaplan

  • 1Department of Chemical Engineering and Biotechnology Center, Tufts University, Medford, Massachusetts 02155 USA.

Biophysical Journal
|April 25, 2000
PubMed
Summary
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Silk-like peptides exhibit diverse structural transitions, forming beta-sheet structures relevant to protein aggregation. Researchers identified silk I, silk II (beta-sheet), and silk III polymorphs, revealing insights into protein conformational changes.

Area of Science:

  • Biochemistry
  • Materials Science
  • Structural Biology

Background:

  • Protein structural transitions and beta-sheet formation are critical in biological processes and diseases like amyloidosis.
  • Silks offer well-characterized polymorphic sequences as models for studying protein structural dynamics.

Purpose of the Study:

  • To characterize the conformational polymorphism of silk-like peptides.
  • To investigate the structural transitions of these peptides under various conditions, including adsorption onto surfaces.

Main Methods:

  • Fourier transform infrared spectroscopy (FTIR)
  • Circular dichroism (CD) spectroscopy
  • Electron diffraction
  • Attenuated total reflectance FTIR (ATR-FTIR)

Related Experiment Videos

Main Results:

  • Peptides based on fibroin C (GAGAGS) formed polymorphs resembling silk I, silk II (beta-sheet), and silk III (helical).
  • Peptides based on fibroin A (GAGAGY) and fibroin V (GDVGGAGATGGS) predominantly crystallized as silk I.
  • Methanol treatment induced a transition from silk I to silk II in fibroin A, with an intermediate beta-turn structure.
  • Fibroin C adopted a silk I-like structure upon adsorption to a hydrophobic surface, forming silk III crystallites upon drying.

Conclusions:

  • Silk-like peptides can adopt multiple stable conformations, mirroring silk polymorphic structures.
  • These peptides serve as valuable models for understanding protein structural transitions relevant to both natural silks and disease-associated protein aggregation.
  • Surface adsorption significantly influences peptide conformation, highlighting the role of interfaces in protein structure determination.