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Patterning via Optical Saturable Transitions - Fabrication and Characterization
Published on: December 11, 2014
Conformational changes during apoplastocyanin folding observed by photocleavable modification and transient grating
Shun Hirota1, Yukari Fujimoto, Jungkwon Choi
1Department of Physical Chemistry, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto 607-8414, Japan. hirota@mb.kyoto-phu.ac.jp
Journal of the American Chemical Society
|June 8, 2006
Summary
Researchers developed a novel method to study protein folding dynamics using pulsed laser light and transient grating. This technique revealed the initial hydrophobic collapse and hydrogen bonding network changes during apoplastocyanin folding.
Area of Science:
- Biophysics
- Protein Dynamics
- Spectroscopy
Background:
- Understanding protein folding is crucial for deciphering biological functions.
- Initial folding dynamics remain challenging to investigate at the molecular level.
Purpose of the Study:
- To develop and apply a new method for observing initial protein folding dynamics.
- To elucidate the early structural changes during the folding of apoplastocyanin (apoPC).
Main Methods:
- Site-specific modification of apoPC with a photocleavable group.
- Pulsed laser triggering and transient grating spectroscopy.
- Circular Dichroism (CD) and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
Main Results:
- Photocleavage of the substituent initiated protein unfolding, confirmed by CD and NMR.
- Transient grating signals monitored photocleavage and subsequent structural recovery.
- Observed a volume decrease (270 μs) attributed to hydrophobic collapse.
- Measured an increase in diffusion coefficient (23 ms) indicating altered hydrogen bonding.
Conclusions:
- The study successfully monitored initial protein folding dynamics in real-time.
- Hydrophobic collapse and changes in hydrogen bonding networks are key early events in apoPC folding.
- The developed method offers new insights into protein dynamics and interactions.
