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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
Published on: November 21, 2013
Nonnative protein polymers: structure, morphology, and relation to nucleation and growth
William F Weiss1, Travis K Hodgdon, Eric W Kaler
1Department of Chemical Engineering, University of Delaware, Newark, Delaware, USA.
Biophysical Journal
|August 21, 2007
Summary
Thermally induced protein aggregates form linear polymer chains. This study characterizes their structure and kinetics, revealing a nucleated polymerization process for alpha-chymotrypsinogen A.
Area of Science:
- Biochemistry
- Protein aggregation
- Polymer science
Background:
- Protein aggregation is implicated in various diseases.
- Understanding aggregation mechanisms is crucial for therapeutic development.
- Soluble, high-molecular-weight protein aggregates present unique characterization challenges.
Purpose of the Study:
- To characterize thermally induced protein aggregates of alpha-chymotrypsinogen A and bovine granulocyte-colony stimulating factor.
- To elucidate the aggregation mechanism, specifically identifying it as nucleated chain polymerization.
- To develop a generalizable method for quantifying aggregation kinetics.
Main Methods:
- Static and dynamic light scattering
- Spectroscopy (including Thioflavin T binding)
- Transmission electron microscopy
- Monomer loss kinetics
Main Results:
- Formation of soluble, linear, semiflexible polymer chains (10^3–10^5 kDa).
- Aggregates exhibit nonnative beta-sheet structure and bind Thioflavin T.
- Aggregation follows nucleated (chain) polymerization with low polydispersity.
- Quantification of nucleation (τn) and growth (τg) timescales for alpha-chymotrypsinogen A.
Conclusions:
- Protein aggregation under these conditions proceeds via nucleated chain polymerization.
- A generalizable method was established for noninvasive kinetic analysis of soluble polymer aggregates.
- The study provides insights into the fundamental mechanisms of protein aggregation.
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