Porphyrin triplet state as a potential spin label for nanometer distance measurements by PELDOR spectroscopy.

@article{Valentin2014PorphyrinTS,
  title={Porphyrin triplet state as a potential spin label for nanometer distance measurements by PELDOR spectroscopy.},
  author={Marilena Di Valentin and Marco Albertini and Enrico Zurlo and Marina Gobbo and Donatella Carbonera},
  journal={Journal of the American Chemical Society},
  year={2014},
  volume={136 18},
  pages={6582-5}
}
This work demonstrates, for the first time, the feasibility of applying pulsed electron-electron double resonance (PELDOR/DEER) to determine the interspin distance between a photoexcited porphyrin triplet state (S = 1) and a nitroxide spin label chemically incorporated into a small helical peptide. The PELDOR trace shows deep envelope modulation induced by electron-electron dipole interaction between the partners in the pair, providing an accurate distance measurement. This new labeling… CONTINUE READING
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