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Time dependence of aggregation in crystallizing lysozyme solutions probed using NMR self-diffusion measurements.
W S Price1, F Tsuchiya, Y Arata
1Department of Physical Chemistry, Royal Institute of Technology, SE-100 44 Stockholm, Sweden. wprice@physchem.kth.se
Biophysical Journal
|February 27, 2001
Summary
This study used NMR diffusion measurements to track protein aggregation kinetics in lysozyme solutions. Higher initial protein concentrations accelerated the aggregation process, influencing crystal formation.
Area of Science:
- Biochemistry
- Biophysics
- Materials Science
Background:
- Protein aggregation is a critical process in biological systems and disease.
- Understanding protein crystallization is essential for drug development and structural biology.
- Lysozyme is a model protein frequently used to study aggregation and crystallization.
Purpose of the Study:
- To investigate the time-dependent aggregation kinetics of lysozyme.
- To determine the influence of initial lysozyme concentration on aggregation.
- To correlate aggregation dynamics with crystallizing conditions.
Main Methods:
- Pulsed-gradient spin-echo (PGSE) NMR diffusion measurements were employed.
- Measurements were conducted on supersaturated lysozyme solutions at pH 6.0 and 298 K.
- The study varied lysozyme concentration in the presence of 0.5 M NaCl.
Main Results:
- The weight-averaged diffusion coefficient revealed sigmoidal kinetics in the change of lysozyme aggregate molecular weight.
- Aggregation kinetics were significantly influenced by the initial protein concentration.
- NMR diffusion measurements provided insights into the time evolution of protein aggregation.
Conclusions:
- Initial protein concentration is a key factor governing lysozyme aggregation kinetics.
- The study visualizes protein aggregation, enhancing understanding of crystallization processes.
- This NMR diffusion approach offers a valuable method for studying protein aggregation dynamics.