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Computer simulation as a tool for tracing the conformational differences between proteins in solution and in the
Journal of Molecular Biology
|July 15, 1984
Summary
Macromolecular conformation in solution closely matches crystal structures, with minor differences in flexible loops and polar side-chains. This finding validates using crystal data to understand protein structures in vivo.
Area of Science:
- Structural Biology
- Computational Biophysics
- Protein Science
Background:
- Crystallography is the primary method for determining macromolecular architecture.
- Concerns exist regarding potential differences between macromolecular conformation in solution (in vivo) and in the crystalline state.
Purpose of the Study:
- To compare the solution conformation of a protein with its crystalline state conformation.
- To investigate potential discrepancies in macromolecular structures between different environments.
Main Methods:
- Molecular dynamics simulations were performed on a protein (trypsin inhibitor) in aqueous solution.
- Results were compared with simulations of the protein's full crystalline unit cell.
Main Results:
- No significant differences were observed in the backbone atoms between solution and crystal states.
- Minor variations were noted in two flexible loops and carboxy-terminal residues.
- Conformational differences in solution primarily involved polar side-chains.
Conclusions:
- Macromolecular structures in solution are largely consistent with their crystalline forms.
- Crystal structures provide a reliable basis for understanding in vivo protein conformations.
- Flexible regions and polar side-chains are key areas for potential environmental influence on protein structure.