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Shramana Palit1, Zikri Hasanbasri1, Nicholas A Moriglioni1

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The Journal of Physical Chemistry Letters
|September 26, 2025
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Summary

A novel copper(II) spin label simplifies distance measurements in biomolecules. This new chelated label offers improved sensitivity and faster data acquisition for Electron Paramagnetic Resonance (EPR) studies.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Spectroscopy

Background:

  • Measuring distance constraints in biomolecules using Cu(II) spin labels at Q-band Electron Paramagnetic Resonance (EPR) is challenging due to selective excitation of label orientations.
  • Existing Cu(II) spin labels exhibit significant g-anisotropy, leading to broad spectral widths and complicating distance measurements.

Purpose of the Study:

  • To introduce a new Cu(II) spin label with reduced g-anisotropy for improved distance measurements in biomolecules.
  • To demonstrate the effectiveness of this novel label in obtaining narrow distance distributions and enhancing sensitivity in EPR spectroscopy.

Main Methods:

  • Development of a new Cu(II) spin label featuring equatorial coordination by four nitrogen atoms, reducing g-anisotropy.
  • Application of the spin label to target specific sites on proteins.
  • Acquisition and analysis of Distance-based Electron Electron Double Resonance (DEER) data at Q-band EPR across various magnetic fields.

Main Results:

  • The novel Cu(II) spin label effectively coordinates to target protein sites, yielding narrow distance distributions.
  • DEER data showed consistent modulation periods across different magnetic fields, indicating successful orientational averaging.
  • A single measurement at maximum intensity was sufficient for accurate distance distribution determination.
  • The label demonstrated a 2.3-fold increase in sensitivity, achieving this in half the data acquisition time compared to existing labels, despite non-stoichiometric binding.

Conclusions:

  • The new equatorially coordinated Cu(II) spin label significantly simplifies distance measurements in biomolecules by reducing spectral width and improving orientational averaging.
  • This advancement offers enhanced sensitivity and efficiency for structural studies using Q-band EPR, making it a valuable tool for biophysical research.