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Related Concept Videos

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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

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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: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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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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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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¹H NMR: Complex Splitting01:13

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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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Solid-state NMR structure determination from diagonal-compensated, sparsely nonuniform-sampled 4D proton-proton

Rasmus Linser1, Benjamin Bardiaux, Loren B Andreas

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Journal of the American Chemical Society
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This study introduces a novel solid-state NMR method using diagonal suppression and nonuniform sampling (NUS) for precise protein structure determination. This technique enhances spectral clarity, yielding reliable restraints for calculating protein structures.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Solid-state NMR is crucial for determining protein structures, but spectral interpretation can be challenging.
  • Strong autocorrelation signals (diagonal peaks) in NMR spectra often obscure important cross-peaks, hindering accurate structural analysis.
  • Existing methods struggle with spectral overlap and dynamic range limitations, impacting the quality of structural restraints.

Purpose of the Study:

  • To develop and validate a novel four-dimensional solid-state NMR approach for acquiring diagonal-compensated protein structural restraints.
  • To improve the accuracy and reliability of structural calculations by enabling unambiguous spectral interpretation.
  • To demonstrate the applicability of this method to diverse protein systems, including microcrystals and amyloid fibrils.

Main Methods:

  • Utilized homonuclear proton-proton correlations with diagonal suppression in four-dimensional solid-state NMR.
  • Employed nonuniform sampling (NUS) with a 2% sampling density, focusing on time-domain regions with high signal intensity.
  • Applied the method to extensively deuterated and proton back-exchanged protein samples.

Main Results:

  • Achieved accurate identification of cross-peaks previously obscured by diagonal signals or biased by overlap.
  • Generated unambiguous spectral interpretations and a reliable set of structural restraints for structure calculation.
  • Demonstrated improved structural ensemble quality for SH3 microcrystals compared to non-diagonal-suppressed spectra.
  • Enabled identification of crucial cross-peaks in partly assigned hydrophobin rodlets, facilitating structural elucidation.

Conclusions:

  • Diagonal suppression in 4D solid-state NMR is an effective strategy for obtaining high-quality protein structural restraints.
  • The combination of diagonal suppression and NUS offers a robust and efficient approach for structural studies of challenging protein systems.
  • This method significantly enhances spectral clarity and reliability, advancing the field of structural biology.