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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...
Ligand Binding Sites02:40

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

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Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy (NMR) and Microscale Thermophoresis (MST)
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Analyzing protein-ligand interactions by dynamic NMR spectroscopy.

Anthony Mittermaier1, Erick Meneses

  • 1Department of Chemistry, McGill University, Montreal, QC, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|June 5, 2013
PubMed
Summary

Nuclear magnetic resonance (NMR) spectroscopy offers unique insights into protein-ligand interactions. This chapter details NMR methods for quantifying weak, transient protein complexes, focusing on affinity and rate constants for complexes with sub-second lifetimes.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Protein-ligand interactions are crucial in biological processes.
  • Characterizing transient and weakly binding complexes remains challenging.
  • Nuclear magnetic resonance (NMR) spectroscopy provides atomic-level insights.

Purpose of the Study:

  • To present NMR-based strategies for analyzing protein-ligand interactions.
  • To focus on methods for determining affinity and rate constants.
  • To address weakly binding transient protein complexes with short lifetimes (<1 second).

Main Methods:

  • Detailed discussion of various NMR pulse sequences.
  • Application of line-shape simulations for data analysis.
  • Utilizing spin-echo relaxation dispersion (CPMG) and magnetization exchange (EXSY) experiments.

Main Results:

  • NMR enables extraction of kinetic and thermodynamic parameters.
  • Methods are suitable for characterizing weak and transient interactions.
  • Provides information inaccessible by other biophysical techniques.

Conclusions:

  • NMR spectroscopy is a powerful tool for studying protein-ligand dynamics.
  • Specific NMR techniques allow quantification of transient complex formation.
  • This chapter provides a guide to advanced NMR approaches for biophysical characterization.