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Revealing Fast Structural Dynamics in pH-Responsive Peptides with Time-Resolved X-ray Scattering.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Structural Biology

Background:

  • Biomaterials can respond to environmental changes like pH, temperature, and ionic composition.
  • This adaptation is a hierarchical process, starting at local structural levels and propagating to larger scales.
  • Understanding these dynamics is key for designing advanced functional biomaterials.

Purpose of the Study:

  • To investigate the nanosecond to microsecond structural dynamics of poly-l-glutamic acid during protonation.
  • To elucidate the hierarchical structural changes induced by pH perturbation at multiple molecular scales.
  • To provide insights for the rational design of responsive biomaterials.

Main Methods:

  • Utilized time-resolved X-ray scattering (TR-XRS) to probe ultrafast structural dynamics.
  • Initiated protonation in poly-l-glutamic acid via a pH jump using photoexcitation of a photoacid.
  • Simultaneously analyzed intra- and intermolecular structural changes with high resolution.

Main Results:

  • Observed hierarchical changes in peptide chain packing upon protonation.
  • Identified the formation of helical structures in response to pH changes.
  • Quantified the associated collapse of the peptide chain structure.

Conclusions:

  • Protonation triggers rapid, hierarchical structural rearrangements in poly-l-glutamic acid.
  • Time-resolved X-ray scattering is effective for studying fast biomaterial dynamics.
  • These findings advance the understanding of responsive polymer behavior for biomaterial applications.