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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

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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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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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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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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NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
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.
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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A dynamic understanding of cytochrome P450 structure and function through solution NMR.

Thomas C Pochapsky1

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Cytochrome P450 monooxygenases catalyze crucial biological oxidations. Solution nuclear magnetic resonance (NMR) reveals enzyme dynamics, essential for understanding P450 specificity and efficiency in complex reactions.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Many vital biosynthetic pathways rely on precise oxidation reactions at unactivated carbon sites.
  • Cytochrome P450 monooxygenases (P450s) are key enzymes catalyzing these regiospecific and stereospecific oxidations by activating molecular oxygen.
  • Understanding P450s is critical for metabolic engineering and drug development.

Purpose of the Study:

  • To investigate the dynamic conformational states of P450 enzymes.
  • To elucidate how enzyme dynamics contribute to the high specificity and efficiency of P450-catalyzed reactions.
  • To explore the utility of solution nuclear magnetic resonance (NMR) for studying these dynamic processes.

Main Methods:

  • High-resolution solution nuclear magnetic resonance (NMR) spectroscopy.
  • Analysis of enzyme conformational dynamics and flexibility.
  • Characterization of substrate binding and orientation within the P450 active site.

Main Results:

  • Static P450 structures do not fully capture the conformational flexibility required for catalytic specificity.
  • Solution NMR provides critical insights into the dynamic transitions and conformational ensembles of P450s.
  • These dynamics are essential for achieving both high specificity and catalytic efficiency.

Conclusions:

  • Enzyme dynamics, revealed by solution NMR, are fundamental to P450 function.
  • Understanding P450 conformational flexibility is key to engineering more efficient and specific biocatalysts.
  • This research highlights NMR as a powerful tool for dissecting enzyme mechanisms.