Electron Spin Resonance Studies

Electron spin resonance (ESR) spectroscopy detects unpaired electrons in a sample, and in biophysics this sensitivity is turned toward understanding how proteins move, fold, and interact by attaching small paramagnetic molecules called nitroxide spin labels to specific sites on a biomolecule. The distances between those labels, measured through pulsed EPR techniques, reveal structural constraints at the nanometer scale that are difficult to obtain by other means, while changes in the ESR signal also report on a cell's redox status and the presence of reactive oxygen species linked to oxidative stress. Active work in the area is pushing toward measuring protein dynamics in living cells rather than purified solutions, and toward combining ESR distance data with computational models to reconstruct full conformational ensembles. A persistent challenge is improving the sensitivity and time resolution of the instruments enough to capture fast, transient biological motions with the same precision currently available for static structures.

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Keywords

Electron Spin ResonanceDistance MeasurementsNitroxide CompoundsProtein DynamicsOxidative StressPulsed EPR Spectroscopy