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Related Concept Videos

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

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

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...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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.
Spin decoupling is usually achieved by...
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not observed.
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.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...

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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Single Transition-to-single Transition Polarization Transfer (ST2-PT) in [15N,1H]-TROSY.

K V Pervushin1, G Wider, K Wüthrich

  • 1Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Hönggerberg, CH-8093, Zürich, Switzerland.

Journal of Biomolecular NMR
|December 8, 2010
PubMed
Summary
This summary is machine-generated.

This study enhances protein NMR by using single transition-to-single transition polarization transfer (ST2-PT) with TROSY, improving sensitivity for stable amide groups and reducing signal loss for labile ones.

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Nuclear Magnetic Resonance (NMR) is crucial for protein structure determination.
  • Transverse Relaxation-Optimized Spectroscopy (TROSY) is a powerful NMR technique for large proteins.
  • Sensitivity and signal loss are key challenges in protein NMR.

Purpose of the Study:

  • To introduce and evaluate single transition-to-single transition polarization transfer (ST2-PT) for [15N,1H]-TROSY.
  • To improve sensitivity and reduce signal loss in protein NMR experiments.
  • To enhance the utility of [15N,1H]-TROSY in complex NMR schemes.

Main Methods:

  • Application of ST2-PT in conjunction with [15N,1H]-TROSY.
  • Implementation of the 'water flip back' technique to suppress solvent saturation transfer.
  • Reduction of phase steps to two for simplified acquisition.

Main Results:

  • ST2-PT provides a significant sensitivity enhancement for kinetically stable amide 15N-1H groups.
  • The 'water flip back' technique effectively suppresses signal loss for labile groups.
  • Inclusion of 15N steady-state magnetization further boosts signal-to-noise ratio beyond theoretical expectations.

Conclusions:

  • ST2-PT is a valuable method for enhancing protein NMR sensitivity using [15N,1H]-TROSY.
  • Optimized TROSY protocols improve data quality and applicability for challenging protein systems.
  • These advancements facilitate more complex NMR studies and structural analyses.