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Combining Wet and Dry Lab Techniques to Guide the Crystallization of Large Coiled-coil Containing Proteins
Published on: January 6, 2017
Mechanical response and conformational amplification in α-helical coiled coils
Osman N Yogurtcu1, Charles W Wolgemuth, Sean X Sun
1Department of Mechanical Engineering, Institute for NanoBio Technology, The Johns Hopkins University, Baltimore, Maryland, USA.
Biophysical Journal
|December 16, 2010
Summary
Alpha-helical coiled coils (CCs) exhibit complex mechanical responses, not just simple elasticity. Understanding their conformational flexibility is key to mechanoprotein function.
Area of Science:
- Biophysics
- Structural Biology
- Mechanobiology
Background:
- Alpha-helical coiled coils (CCs) are common structural domains in mechanoproteins.
- CCs are known for mechanical rigidity and force transmission.
- Limited data exists on CC conformational flexibility and the role of hydrophobic interactions.
Purpose of the Study:
- To investigate the mechanical responses of typical CCs.
- To develop a coarse-grained model for CC conformation.
- To clarify the role of hydrophobic interactions in CC structure and mechanics.
Main Methods:
- Constructed a coarse-grained mechanical model treating alpha-helices as elastic rods.
- Incorporated hydrophobic bonds to define CC structure.
- Compared model predictions with molecular-dynamics simulations under force.
Main Results:
- CCs exhibit complex, nonlinear mechanical responses, deviating from simple elastic rod behavior.
- The model accurately predicts CC mechanical behavior.
- Conformational amplification upon small molecule binding was observed.
Conclusions:
- CCs possess intricate mechanical properties beyond simple elasticity.
- The developed model provides insights into CC conformational dynamics.
- Findings are crucial for understanding CC roles in chemoreceptors, motor proteins, and mechanotransduction.
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