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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Related Experiment Video

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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Published on: June 27, 2014

Complementary Benzophenone Cross-Linking/Mass Spectrometry Photochemistry.

Adam Belsom1, Gemma Mudd2, Sven Giese3

  • 1Wellcome Trust Centre for Cell Biology, Institute of Cell Biology, School of Biological Sciences, University of Edinburgh , Edinburgh EH9 3BF, U.K.

Analytical Chemistry
|April 22, 2017
PubMed
Summary

Researchers developed a new photo-cross-linking reagent, sulfo-SBP (benzophenone), enhancing protein structure analysis. This method, alongside sulfo-SDA (diazirine), provides unprecedented data density for protein structure modeling.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Chemical Biology

Background:

  • Photoactivatable cross-linking is crucial for protein structure modeling.
  • Sulfo-SDA (diazirine) has been used to generate high-density cross-linking data.
  • Existing methods have limitations in accessing all protein regions.

Purpose of the Study:

  • To introduce a new photoactivatable cross-linking reagent, sulfo-SBP (benzophenone).
  • To increase the density of photo-cross-linking data.
  • To enable access to previously unreachable protein regions through orthogonal cross-linking.

Main Methods:

  • Utilized a heterobifunctional photoactivatable cross-linker, sulfo-SBP (benzophenone).
  • Employed sulfo-SDA (diazirine) in conjunction with sulfo-SBP.
  • Applied photo-cross-linking techniques to generate high-density datasets.

Main Results:

  • Achieved a 20× increase in photo-cross-linking density compared to conventional methods.
  • Demonstrated orthogonal directionality between sulfo-SDA and sulfo-SBP.
  • Enabled mapping of protein regions inaccessible with single cross-linkers.

Conclusions:

  • Sulfo-SBP expands the utility of photoactivatable cross-linking chemistry.
  • The combination of sulfo-SDA and sulfo-SBP offers enhanced capabilities for protein structure determination.
  • Orthogonal cross-linking strategies provide comprehensive insights into protein architecture.