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Characterizing Protein Structure, Dynamics and Conformation in Lyophilized Solids.

Balakrishnan S Moorthy, Lavanya K Iyer, Elizabeth M Topp1

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Understanding protein stability in lyophilized solids is key for drug formulation. This review covers analytical techniques, including novel mass spectrometry methods, to assess protein structure and prevent degradation during storage.

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Area of Science:

  • Biopharmaceutical Science
  • Analytical Chemistry
  • Protein Chemistry

Background:

  • Long-term stability of protein therapeutics is critical for efficacy and safety.
  • Lyophilization (freeze-drying) can induce protein unfolding and degradation in the solid-state.
  • Characterizing protein structure in dried formulations is essential for robust drug design.

Purpose of the Study:

  • To review analytical techniques for characterizing protein structure, dynamics, and conformation in lyophilized solids.
  • To highlight the utility of advanced mass spectrometry methods for solid-state protein analysis.

Main Methods:

  • Review of established analytical techniques for solid-state protein characterization.
  • Discussion of solid-state hydrogen deuterium exchange mass spectrometry (ssHDX-MS).
  • Discussion of solid-state photolytic labeling mass spectrometry (ssPL-MS).

Main Results:

  • Established techniques provide insights into protein structure and conformation in lyophilized states.
  • ssHDX-MS and ssPL-MS offer high-resolution capabilities for studying solid-state protein behavior.
  • These advanced methods can identify structural changes and degradation pathways.

Conclusions:

  • Accurate characterization of proteins in the dried state is vital for developing stable therapeutic formulations.
  • Emerging mass spectrometry techniques significantly enhance the ability to study solid-state protein properties.
  • Improved understanding of solid-state protein behavior will lead to safer and more effective protein drugs.