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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Microsecond Exchange Processes Studied by Two-Dimensional ESR at 95 GHz.

Boris Dzikovski1, Valery V Khramtsov2, Siddarth Chandrasekaran1

  • 1Department of Chemistry and Chemical Biology, and ACERT, National Biomedical Center for Advanced Electron Spin Resonance Technology, Cornell University, Ithaca, New York 14853-1301, United States.

Journal of the American Chemical Society
|December 11, 2020
PubMed
Summary
This summary is machine-generated.

Two-dimensional electron spin resonance (2D ESR) using 2D-ELDOR enables real-time studies of nanosecond to microsecond exchange processes. This technique, particularly at 95 GHz, allows observation of chemical exchange in nitroxide spin labels, previously not possible.

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Area of Science:

  • Electron Paramagnetic Resonance (EPR) Spectroscopy
  • Chemical Kinetics and Dynamics
  • Biophysical Chemistry

Background:

  • Two-dimensional Nuclear Magnetic Resonance (2D NMR) is standard for studying exchange processes (conformational change, protonation, binding) on millisecond timescales via cross-peak analysis.
  • Electron Spin Resonance (ESR) techniques, like 2D-ELDOR, offer potential for studying faster exchange processes (nanosecond to microsecond) but are limited by signal resolution for common probes like nitroxides.
  • Increased g-factor resolution at higher ESR frequencies (e.g., 95 GHz) can overcome limitations in resolving exchanging states within their linewidths.

Purpose of the Study:

  • To demonstrate the capability of 95 GHz 2D-ELDOR for studying chemical exchange processes involving nitroxide spin labels.
  • To analyze cross-peak development arising from chemical exchange in systems relevant to biophysical and chemical studies.

Main Methods:

  • Utilized advanced 95 GHz Electron Spin Resonance (ESR) instrumentation at ACERT.
  • Employed two-dimensional Electron-Electron Double Resonance (2D-ELDOR) to observe cross-peak development.
  • Studied a pH-sensitive imidazoline spin label and a nitroxide radical partitioning between aqueous and lipid phases.

Main Results:

  • Successfully observed and analyzed cross-peak development due to chemical exchange in nitroxide spin labels at 95 GHz.
  • Demonstrated the study of protonation/deprotonation dynamics of an imidazoline spin label, controlled by buffer pH and concentration.
  • Showcased the analysis of nitroxide radical exchange between aqueous and phospholipid environments in lipid vesicles.

Conclusions:

  • 95 GHz 2D-ELDOR is a powerful technique for real-time investigation of nanosecond to microsecond chemical exchange processes involving nitroxide spin labels.
  • This work establishes the first observation and analysis of cross-peaks from chemical exchange using nitroxide spin labels in ESR.
  • The developed methodology opens new avenues for studying molecular dynamics in various chemical and biological systems.