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Related Experiment Videos

Relationship between conformational stability and lyophilization-induced structural changes in chymotrypsin.

K G Carrasquillo1, C Sanchez, K Griebenow

  • 1Department of Chemistry, University of Puerto Rico, R ío Piedras Campus, P.O. Box 23346, San Juan, PR 00931-3346, Puerto Rico.

Biotechnology and Applied Biochemistry
|February 11, 2000
PubMed
Summary

Protein conformational stability in solution does not predict structural changes during lyophilization. Trehalose protects proteins by counteracting dehydration, not by increasing solution stability.

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Area of Science:

  • Protein chemistry
  • Biophysics
  • Pharmaceutical sciences

Background:

  • Protein conformational stability is crucial for drug formulation.
  • Lyophilization is a common drying technique for stabilizing proteins.
  • Understanding factors influencing structural changes during lyophilization is essential.

Purpose of the Study:

  • To investigate the relationship between protein conformational stability in solution and lyophilization-induced structural changes.
  • To determine the role of lyoprotectants, such as trehalose, in mitigating these changes.
  • To elucidate the primary mechanism causing structural alterations during lyophilization.

Main Methods:

  • Determined melting temperature (Tm) of alpha- and gamma-chymotrypsin at various pH values to assess conformational stability.

Related Experiment Videos

  • Lyophilized proteins from pH values of maximum (4.5) and minimum (7.8) stability.
  • Quantified protein secondary structure using Fourier-transform infrared (FTIR) spectroscopy (amide-I and amide-III bands).
  • Investigated the effect of trehalose as a lyoprotectant through co-lyophilization experiments.
  • Conducted air-drying experiments to differentiate between freezing and dehydration effects.

    • Main Results:

    • Lyophilization induced significant alterations in protein secondary structure, increasing beta-sheet content and decreasing alpha-helix content.
    • Solid-state secondary structures were indistinguishable regardless of the initial solution pH or conformational stability.
    • No correlation was found between solution conformational stability and the extent of lyophilization-induced structural changes.
    • Trehalose effectively prevented structural alterations, but this protection was independent of its effect on protein conformational stability in aqueous solution.
    • Air-drying experiments indicated that dehydration, not freezing, is the primary cause of structural changes.

    Conclusions:

    • Protein conformational stability in aqueous solution does not predict structural integrity after lyophilization.
    • Lyoprotectants like trehalose preserve protein structure during lyophilization primarily by mitigating dehydration effects.
    • Dehydration is the main driver of protein structural alterations during lyophilization, overriding effects of solution stability.