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Related Experiment Video

Updated: Jun 19, 2026

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
07:24

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Published on: September 23, 2021

Characterizing dynamic protein-protein interactions using differentially scaled paramagnetic relaxation enhancement.

Dongmei Yu1, Alexander N Volkov, Chun Tang

  • 1Department of Biochemistry, University of Missouri, Columbia, Missouri 65211, USA.

Journal of the American Chemical Society
|November 7, 2009
PubMed
Summary

This study introduces differentially scaled paramagnetic relaxation enhancement (DiSPRE), a new NMR method for visualizing minor species. DiSPRE uses dual paramagnetic probes to characterize dynamic systems and reveals a novel excited-state complex in enzyme-HPr interactions.

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Area of Science:

  • Biophysical Chemistry
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Biology

Background:

  • Paramagnetic relaxation enhancement (PRE) is an NMR technique for visualizing minor species by conjugating paramagnetic probes.
  • Fast exchange between major and minor species leads to a population-weighted average of PRE values.
  • Existing PRE methods have limitations in characterizing dynamic systems with weak interactions.

Purpose of the Study:

  • To develop an improved PRE scheme for enhanced temporal and spatial characterization of dynamic systems.
  • To extract relative population and exchange time scales using probes of different paramagnetic strengths.
  • To investigate weak interactions between enzyme I and phosphocarrier protein (HPr).

Main Methods:

  • Employment of a tripeptide with a Cu(2+)-binding paramagnetic probe for weaker PRE effects.
  • Development of the differentially scaled paramagnetic relaxation enhancement (DiSPRE) scheme using two probes of different paramagnetic strengths.
  • Application of DiSPRE to study enzyme I-HPr interactions in the bacterial phosphotransferase system.

Main Results:

  • The DiSPRE scheme allows extraction of relative population and exchange time scales for dynamic events in the second to millisecond regime.
  • A minor species of excited-state complex (approximately 4% population) was identified between enzyme I and HPr.
  • This excited-state complex exchanges with the stereospecific complex at approximately 1100 s(-1).

Conclusions:

  • DiSPRE provides a powerful tool for temporal and spatial characterization of dynamic systems, particularly those involving minor species.
  • The identified excited-state complex suggests a degree of promiscuity in the HPr binding interface.
  • This finding offers new insights into the mechanisms of protein-protein interactions in the phosphotransferase system.