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Nuclear Magnetic Resonance (NMR): Overview

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...

Proton (¹H) NMR: Chemical Shift

Proton (¹H) NMR: Chemical Shift

Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei in a...

¹H NMR: Complex Splitting

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.

Two-Dimensional (2D) NMR: Overview

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.

Applications Of NMR In Biology

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...

Proteomics

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...

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Related Experiment Video

Updated: Jun 30, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

Multidimensional NMR spectroscopy for protein characterization and assignment inside cells.

Patrick N Reardon¹, Leonard D Spicer

¹Departments of Biochemistry and Radiology, Duke University Medical Center, Durham, NC 27710, USA.

Journal of the American Chemical Society

|August 4, 2005

Summary

This summary is machine-generated.

This study introduces fast 3D Nuclear Magnetic Resonance (NMR) experiments for analyzing proteins within living cells. These rapid techniques enable complete backbone assignment of the GB-1 protein in Escherichia coli, overcoming previous limitations.

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Area of Science:

Biophysical Chemistry
Structural Biology
Molecular Biophysics

Background:

High-field, heteronuclear Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for studying biological macromolecules.
Analyzing proteins within their native cellular environments is challenging due to low concentrations and lengthy experiment times.
Conventional 3D NMR experiments for protein characterization are often too time-consuming for in vivo applications, limiting cell viability.

Purpose of the Study:

To develop and implement a suite of fast 3D NMR experiments for in vivo analysis of biological macromolecules.
To overcome the limitations of long data acquisition times in cellular NMR studies.
To achieve complete backbone assignment of a recombinant protein within live Escherichia coli cells.

Main Methods:

Utilized high-field (600 MHz) heteronuclear NMR spectroscopy with a cold probe.
Employed projection reconstruction techniques for rapid data acquisition.
Performed fast 3D NMR experiments, including (3,2)HNCA, (3,2)HNCO, and (3,2)HA(CA)NH.

Main Results:

Successfully implemented a suite of fast 3D NMR experiments in vivo.
Generated complete backbone assignment of resonances for the recombinant polypeptide GB-1.
Demonstrated the feasibility of obtaining detailed structural information from proteins within live bacterial cells.

Conclusions:

Fast 3D NMR techniques enable efficient in vivo structural studies of proteins in their native cellular context.
This approach overcomes previous time constraints, allowing for detailed characterization of proteins within viable cells.
The developed methods pave the way for advanced cellular NMR investigations of complex biological systems.