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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

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Related Experiment Video

Updated: May 29, 2026

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
11:19

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

Published on: July 4, 2016

RNA dynamics: perspectives from spin labels.

Phuong Nguyen1, Peter Z Qin

  • 1Department of Chemistry, University of Southern California, Los Angeles, CA, USA.

Wiley Interdisciplinary Reviews. RNA
|September 2, 2011
PubMed
Summary
This summary is machine-generated.

Site-Directed Spin Labeling (SDSL) monitors RNA dynamics, revealing insights into their structure and function. This technique probes molecular motions across various timescales, enhancing our understanding of RNA

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • RNA dynamics are crucial for RNA function, exhibiting complexity across vast timescales and numerous physical modes.
  • Understanding RNA dynamics is essential for deciphering their roles in biological processes.

Purpose of the Study:

  • To summarize the current state of Site-Directed Spin Labeling (SDSL) studies in investigating RNA dynamics.
  • To highlight the application of SDSL in probing both intrinsic and conformational transition dynamics of RNAs.

Main Methods:

  • Site-Directed Spin Labeling (SDSL) combined with Electron Paramagnetic Resonance (EPR) spectroscopy.
  • Monitoring chemically stable nitroxide radicals attached to specific sites on RNA molecules.
  • Deriving information on local structural and dynamic features of RNA.

Main Results:

  • SDSL has been successfully applied to monitor RNA dynamics at defined structural states.
  • The technique allows for the probing of conformational transition dynamics in RNA molecules.
  • Current SDSL studies provide valuable data on the intricate dynamics of RNA.

Conclusions:

  • SDSL is a powerful technique for studying RNA dynamics.
  • Further development and application of SDSL will expand opportunities for understanding RNA dynamics.
  • Connecting RNA dynamics to structure and function is facilitated by SDSL.