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Related Concept Videos

Applications Of NMR In Biology01:25

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...
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...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.

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STD-NMR: application to transient interactions between biomolecules-a quantitative approach.

Jesus Angulo1, Pedro M Nieto

  • 1Instituto de Investigaciones Químicas, CSIC - US, Sevilla, Spain. jesus@iiq.csic.es

European Biophysics Journal : EBJ
|September 28, 2011
PubMed
Summary

Saturation transfer difference NMR (STD NMR) spectroscopy is a robust method for studying fast receptor-ligand interactions. This review highlights its quantitative applications in understanding molecular recognition in biochemistry.

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Area of Science:

  • Biochemistry
  • Chemical Physics
  • Molecular Biology

Background:

  • Saturation transfer difference NMR (STD NMR) spectroscopy is a key technique for analyzing molecular interactions.
  • It excels at detecting transient receptor-ligand binding events in solution.
  • The method is valuable for studying molecular recognition processes.

Purpose of the Study:

  • To review the current status and capabilities of STD NMR spectroscopy.
  • To emphasize the quantitative applications of STD NMR.
  • To discuss its role in the biochemistry of molecular recognition.

Main Methods:

  • Utilizes STD NMR spectroscopy to observe ligand signals.
  • Applicable to small molecules with suitable spectroscopic properties.
  • Independent of receptor size for high-resolution studies.

Main Results:

  • STD NMR provides quantitative structural and affinity information.
  • The technique is mature, robust, and highly useful.
  • Enables detailed characterization of molecular recognition.

Conclusions:

  • STD NMR spectroscopy is a powerful tool for studying receptor-ligand interactions.
  • Its quantitative capabilities are crucial for understanding molecular recognition.
  • The technique is well-established and widely applicable in biochemistry.