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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
08:03

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

Light-controlled protein dynamics observed with neutron spin echo measurements.

Shao-Chun Wang1, Panteha Mirarefi, Antonio Faraone

  • 1Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1211, USA.

Biochemistry
|August 4, 2011
PubMed
Summary

A light-responsive surfactant, azoTAB, controls protein structure and dynamics. Visible light causes partial unfolding, while UV light promotes refolding and enhances protein activity, offering a novel method for protein control.

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Area of Science:

  • Biophysics
  • Protein Dynamics
  • Surfactant Chemistry

Background:

  • Proteins are essential biomolecules whose structure and dynamics dictate function.
  • Controlling protein behavior with external stimuli is crucial for biochemical research and therapeutic applications.
  • Photoresponsive surfactants offer a promising avenue for light-induced modulation of biological systems.

Purpose of the Study:

  • To investigate the light-induced control of lysozyme's structure and dynamics using a photoresponsive surfactant, azoTAB.
  • To elucidate the relationship between protein conformation, internal motions, and enzymatic activity under varying light conditions.
  • To explore the potential of azoTAB as a tool for light-based protein engineering.

Main Methods:

  • Small-angle neutron scattering (SANS) to determine protein tertiary structure.
  • Neutron spin echo (NSE) spectroscopy to measure protein internal dynamics.
  • Fourier transform infrared spectroscopy (FTIR) for hydrogen-deuterium exchange kinetics.
  • Intramolecular fluorescent resonance energy transfer (FRET) for ensemble-averaged dynamics.

Main Results:

  • Visible light induced partial unfolding of lysozyme, primarily in the hinge region, while UV light promoted refolding to a native-like structure.
  • The trans form of azoTAB (visible light) enhanced lysozyme's internal dynamics and protein activity.
  • The cis form of azoTAB (UV light) resulted in dynamics similar to native lysozyme, suggesting dormancy.
  • Protein dynamics were modeled using domain-based approaches, correlating large domain motions with activity.

Conclusions:

  • AzoTAB enables light-dependent modulation of protein structure, dynamics, and function.
  • Enhanced protein dynamics, particularly large domain motions, are linked to increased protein activity.
  • This study presents a novel light-based strategy for controlling protein behavior, with implications for protein engineering and drug development.