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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
Published on: February 5, 2020
Mechanically unfolding protein L using a laser-feedback-controlled cantilever.
Neal Crampton1, Khalid Alzahrani, Godfrey S Beddard
1School of Physics and Astronomy, University of Leeds, Leeds, United Kingdom. n.crampton@leeds.ac.uk
Biophysical Journal
|April 6, 2011
Summary
A new constant-deflection atomic force microscope (AFM) technique reveals a more complex protein unfolding energy landscape. This method overcomes limitations of conventional AFM, detecting previously hidden refolding intermediates.
Area of Science:
- Biophysics
- Materials Science
- Nanotechnology
Background:
- Atomic force microscopy (AFM) force spectroscopy is crucial for studying protein folding dynamics and energy landscapes.
- Conventional AFM uses a compliant cantilever, limiting the probed force spectrum and potentially masking intermediate states due to recoil.
Purpose of the Study:
- To introduce a novel constant-deflection AFM technique to overcome conventional limitations.
- To re-characterize the unfolding energy landscape of protein L with enhanced resolution.
Main Methods:
- Developed and implemented a constant-deflection AFM technique, removing cantilever compliance.
- Applied the new technique to mechanically unfold protein L at varying velocities.
Main Results:
- The constant-deflection AFM revealed a more complex unfolding energy landscape for protein L than previously observed.
- This technique successfully detected a refolding intermediate, which is typically obscured by cantilever recoil in conventional AFM.
Conclusions:
- Constant-deflection AFM provides a superior method for detailed characterization of protein energy landscapes.
- This technique enhances the ability to identify transient intermediates in protein folding and unfolding pathways.
