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Related Experiment Videos

A solid-state NMR study of protein hydration and stability

F Separovic1, Y H Lam, X Ke

  • 1School of Chemistry, University of Melbourne, Parkville, Vic, Australia. f.separovic@chemistry.unimelb.edu.au

Pharmaceutical Research
|January 19, 1999
PubMed
Summary

Protein mobility in powders decreases with increasing water content, leading to greater aggregation and reduced activity. Solid-state NMR reveals this link between hydration, mobility, aggregation, and protein function.

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Area of Science:

  • Biophysics
  • Protein Chemistry
  • Solid-State Nuclear Magnetic Resonance (NMR)

Background:

  • Protein stability is crucial for pharmaceutical formulations.
  • Understanding protein mobility at different hydration levels is key to preventing aggregation.

Purpose of the Study:

  • To investigate the relationship between protein mobility, hydration levels, aggregation, and activity.
  • To determine how water content affects protein dynamics in lyophilized powders.

Main Methods:

  • Solid-state NMR (13C, 15N, 1H, 2H, 17O) was used to measure protein mobility (T1 and T1p relaxation).
  • Hydration levels were controlled using varying relative humidities (RH).
  • Protein aggregation was assessed using size exclusion chromatography, and activity was measured via bioassays.

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Main Results:

  • Decreased protein surface mobility (reduced T1) was observed with increasing hydration (0-98% RH).
  • Increased weakly-bound water correlated with decreased protein mobility and increased aggregation.
  • Protein aggregation was consistent with hydration-dependent mobility data.

Conclusions:

  • Water content significantly alters protein molecule mobility in powders.
  • Protein aggregation and activity are strongly correlated with changes in molecular mobility.