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Updated: Jun 12, 2026

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
Published on: September 23, 2021
ENDOR study on the dynamic properties of the first stable paramagnetic center in gamma-irradiated L-alanine crystals
Boris Rakvin1, Nadica Maltar-Strmecki, Daniel Kattnig
1Ruder Bosković Institute, P.O. Box 180, 10002, Zagreb, Croatia. rakvin@irb.hr
Abstract:
Dynamic properties of the first stable l-alanine radical, SAR1, induced by gamma-irradiation of l-alanine crystals, have been investigated by the electron nuclear double resonance technique (ENDOR). The study focuses on the dynamic properties of the alpha-proton hyperfine splitting in the temperature range from 180 to 320 K. In this region the motion of the NH(3)(+) and CH(3) groups exhibits slow and fast motional dynamics in comparison to the nuclear and electron Larmor frequencies, respectively. Evidence for different conformations of the SAR1 center is presented on the basis of thermodynamic properties of the alpha-hyperfine splitting. The activation processes causing the broadening of the ENDOR lines are studied. At room temperature the motional dynamics of the SAR1 center are modulated by the dynamics of the charged, neighboring NH(3)(+) group.
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