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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Orientation-Selective and Frequency-Correlated Light-Induced Pulsed Dipolar Spectroscopy
Alice M Bowen1,2, Arnau Bertran2, Kevin B Henbest2
1Department of Chemistry, Photon Science Institute and The National EPR Research Facility, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.
The Journal of Physical Chemistry Letters
|April 15, 2021
Summary
Light-induced pulsed dipolar spectroscopy (PDS) with triplets reveals atomic-level structural details in biochemical systems. This method provides precise distance and orientation information, advancing molecular studies.
Area of Science:
- Biophysics
- Spectroscopy
- Structural Biology
Background:
- Optically active cofactors are crucial in biochemical systems.
- Cofactors are often rigidly bound within protein structures.
- Pulsed dipolar spectroscopy (PDS) can study these systems.
Purpose of the Study:
- To explore light-induced orientation-resolved PDS for studying biochemical systems.
- To analyze orientation selection effects for distance and orientation determination.
- To obtain atomic-level structural information.
Main Methods:
- Utilizing triplets as spin-active moieties for PDS.
- Performing a comprehensive analysis of orientation selection in light-induced PDS experiments.
- Measuring a 2D frequency-correlated laser-induced magnetic dipolar spectrum.
Main Results:
- Demonstrated orientation selection effects in light-induced PDS.
- Successfully measured a 2D frequency-correlated laser-induced magnetic dipolar spectrum.
- Obtained complete orientation dependence in a single experiment.
Conclusions:
- Light-induced PDS with triplets is a powerful tool for structural analysis of biochemical systems.
- The method provides both distance and orientation information with atomic resolution.
- The 2D spectrum offers a comprehensive orientation-dependent analysis.
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