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Pressure denaturation of apomyoglobin: a molecular dynamics simulation study.
Andrés N McCarthy1, J Raúl Grigera
1Instituto de Física de Líquidos y Sistemas Biológicos, IFLYSIB, CONICET-UNLP-CIC, and Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata. 49-789, cc 565, B1900BTE La Plata, Argentina.
Biochimica Et Biophysica Acta
|March 1, 2006
Summary
High hydrostatic pressure alters sperm whale apomyoglobin structure, favoring alpha-helices and increasing exposed hydrophobic surface area. This suggests hydrophobic interactions weaken under pressure.
Area of Science:
- Biophysics
- Computational Biology
- Protein Dynamics
Background:
- Sperm whale apomyoglobin is a model protein for studying pressure effects.
- Understanding protein behavior under pressure is crucial for various biological and industrial applications.
Purpose of the Study:
- To investigate the impact of hydrostatic pressure on the structure and mobility of sperm whale apomyoglobin.
- To analyze pressure-induced changes in secondary and tertiary structures, and solvent-accessible surface area.
Main Methods:
- Molecular Dynamics (MD) computer simulations were performed at 1 bar and 3 kbar.
- Analysis included secondary structure, residue mobility, tertiary structure, and solvent-accessed surface (SAS) evolution.
Main Results:
- Simulations showed good agreement with experimental data.
- Pressure favored alpha-helices over bends and turns, while restricting overall mobility but not for all residues.
- Significant conformational changes and a notable increase in exposed hydrophobic surface area were observed.
Conclusions:
- High hydrostatic pressure alters apomyoglobin's structural and dynamic properties.
- Increased exposed hydrophobic area suggests weakened hydrophobic interactions under pressure.
- MD simulations provide valuable insights into pressure effects on protein solutions.