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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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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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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
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Bridging protein structure, dynamics, and function using hydrogen/deuterium-exchange mass spectrometry.

Edgar A Hodge1, Mark A Benhaim1, Kelly K Lee1

  • 1Department of Medicinal Chemistry, University of Washington, Seattle, Washington.

Protein Science : a Publication of the Protein Society
|November 14, 2019
PubMed
Summary

Hydrogen/Deuterium-exchange Mass Spectrometry (HDX-MS) reveals dynamic protein structure and function in solution. This technique monitors protein fluctuations and conformational changes, offering insights beyond static structures.

Keywords:
conformational switchingconformational transitionshydrogen/deuterium-exchange mass spectrometry (HDX-MS)intrinsic disorderstructural dynamicsstructural rearrangements

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Area of Science:

  • Structural Biology
  • Biophysics
  • Biochemistry

Background:

  • Static high-resolution protein structures limit understanding of mechanistic function in solution.
  • Protein dynamics and conformational changes are crucial for function but often missed by traditional methods.

Purpose of the Study:

  • To review the application of Hydrogen/Deuterium-exchange Mass Spectrometry (HDX-MS) for monitoring dynamic protein changes.
  • To highlight HDX-MS's utility in studying protein structure and function under native conditions.

Main Methods:

  • Hydrogen/Deuterium-exchange Mass Spectrometry (HDX-MS) is presented as a key technique.
  • HDX-MS allows direct monitoring of protein structural fluctuations and conformational dynamics in solution.

Main Results:

  • HDX-MS provides novel insights into protein structure and function, complementing static structural data.
  • The technique has been applied to diverse systems, including large assemblies and intrinsically disordered proteins.
  • HDX-MS probes conformational changes during critical processes like protein folding and catalysis.

Conclusions:

  • HDX-MS is a powerful tool for understanding protein dynamics and function in solution.
  • It offers unique capabilities to observe dynamic events often invisible to other structural biology methods.
  • This review underscores the value of HDX-MS in advancing the study of protein mechanics.