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Structural principles governing domain motions in proteins.
1BIOSON Research Institute, Laboratory of Biophysical Chemistry, University of Groningen, Groningen, The Netherlands. steve@chem.rug.nl
Proteins
|August 18, 1999
Summary
Protein domain motion is governed by rotation around physical axes formed by local interactions. Mechanical hinges, including alpha-helices and beta-sheets, enable precise domain closure, potentially allowing prediction of protein dynamics.
Area of Science:
- Structural Biology
- Biophysics
- Computational Biology
Background:
- Understanding protein domain motion is crucial for deciphering protein function.
- Previous methods limited the analysis of dynamic protein structures.
Purpose of the Study:
- To identify structural principles governing domain motions in proteins.
- To analyze protein domain movements using a novel computational method.
Main Methods:
- Analysis of 24 proteins with known multiple X-ray conformers.
- Identification of physical axes and mechanical hinges responsible for domain rotation.
Main Results:
- Domain motion primarily occurs via rotation around axes formed by covalent and noncovalent interactions.
- Mechanical hinges include alpha-helix and beta-sheet termini, flexible loops, and remote noncovalent interactions.
- Specialized structures like "double-hinged beta-sheet" and "double-hinged alpha-helix" stabilize hinge axes.
Conclusions:
- The identified hinge structures provide a limited but predictable repertoire for interdomain movements.
- This suggests the potential for predicting protein dynamic behavior using bioinformatics.
- Certain alpha-helices may store elastic energy, facilitating substrate capture through domain closure.