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How native proteins aggregate in solution: a dynamic Monte Carlo simulation
Lin Zhang1, Diannan Lu, Zheng Liu
1Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
Biophysical Chemistry
|January 22, 2008
Summary
Native proteins aggregate in solution, especially when partially unfolded. Adding polymers can prevent this protein aggregation by shielding hydrophobic regions, a finding consistent with experimental data.
Area of Science:
- Biophysics
- Computational Biology
- Protein Science
Background:
- Protein aggregation in solution is critical for protein processing and applications.
- Understanding the molecular mechanisms of protein aggregation is essential for controlling it.
Purpose of the Study:
- To gain molecular insight into protein aggregation in solution using a dynamic Monte Carlo simulation.
- To investigate methods for suppressing protein aggregation.
Main Methods:
- A two-dimensional (2D) lattice model (HP model) representing proteins of varying compositions and conformations was used.
- Dynamic Monte Carlo simulations were performed to model protein behavior in solution.
Main Results:
- Native proteins with exposed hydrophobic regions are prone to aggregation.
- Aggregation is exacerbated when solution conditions promote partially unfolded protein conformations.
- Partially unfolded proteins can form aggregate cores, potentially enclosing native proteins.
Conclusions:
- Accessible hydrophobic regions drive protein aggregation.
- Partially unfolded states are key intermediates in the aggregation process.
- Introducing polymers of suitable hydrophobicity and length can inhibit protein aggregation by segregating protein molecules.
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