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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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Protein dynamics and function from solution state NMR spectroscopy.

Michael Kovermann1, Per Rogne1, Magnus Wolf-Watz1

  • 1Department of Chemistry,Umeå University,SE-901 87 Umeå,Sweden.

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Protein dynamics are crucial for function. Nuclear magnetic resonance (NMR) spectroscopy offers unique capabilities to quantitatively analyze these dynamics across various timescales, advancing molecular understanding.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Protein dynamics are fundamental to protein function, as recognized by models like Monod, Wyman, and Changeux.
  • Current understanding of protein dynamics is framed by energy landscape theory, explaining folding and conformational changes.

Purpose of the Study:

  • To review Nuclear Magnetic Resonance (NMR) spectroscopy techniques for quantifying protein dynamics.
  • To highlight NMR's unique advantages in studying protein dynamics across diverse timescales.

Main Methods:

  • Review of established and advanced NMR spectroscopy techniques.
  • Application of NMR to analyze protein dynamics on ps-ns, μs-ms, and s-min timescales.

Main Results:

  • NMR spectroscopy enables quantitative analysis of protein dynamics under equilibrium conditions.
  • NMR allows simultaneous monitoring of multiple probes and analysis over extended time intervals.
  • Advances in NMR theory, hardware, and methods provide unprecedented detail in characterizing protein dynamics.

Conclusions:

  • NMR spectroscopy is uniquely suited for detailed, quantitative analysis of protein dynamics.
  • NMR-driven insights have led to major discoveries in protein science.
  • Understanding protein dynamics is key to molecular-level comprehension of protein function.