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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...

NMR Spectrometers: Overview

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...

¹H NMR: Interpreting Distorted and Overlapping Signals

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...

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....

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the 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.

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Related Experiment Video

Updated: Apr 7, 2026

Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening

Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening

Published on: April 1, 2016

NMR-guided directed evolution.

Sagar Bhattacharya¹, Eleonora G Margheritis², Katsuya Takahashi²

¹Department of Chemistry, Syracuse University, Syracuse, NY, USA.

|October 5, 2022

Summary

This summary is machine-generated.

Researchers developed a new NMR spectroscopy method to identify key mutation sites in proteins. This approach efficiently converted myoglobin into a Kemp eliminase with just three mutations, showcasing a powerful tool for protein engineering.

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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

Published on: March 25, 2020

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Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening

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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity

Published on: March 25, 2020

Area of Science:

Biochemistry and Molecular Biology
Protein Engineering
Enzyme Catalysis

Background:

Directed evolution is crucial for protein improvement and functionalization but is limited by vast sequence space.
Current methods for predicting beneficial mutations often rely on structural or bioinformatics data, which are not always available.
Identifying mutations distant from active sites, which can significantly enhance enzyme properties, remains challenging.

Purpose of the Study:

To establish a novel method for identifying mutagenic hot spots in enzymes using NMR spectroscopy.
To demonstrate the utility of this method in engineering novel enzymatic functions.
To overcome limitations of existing prediction approaches for protein engineering.

Main Methods:

Utilized Nuclear Magnetic Resonance (NMR) spectroscopy to identify mutagenic hot spots.
Applied a proof-of-concept study involving the directed evolution of myoglobin.
Introduced minimal mutations to confer new enzymatic activity.

Main Results:

Successfully converted myoglobin, a non-enzymatic protein, into a highly efficient Kemp eliminase using only three mutations.
Achieved catalytic efficiency levels comparable to naturally occurring enzymes for the targeted reaction.
Demonstrated that this method surpasses current protein design approaches in efficiency.

Conclusions:

NMR spectroscopy provides a simple and effective experimental approach to identify key residues for protein engineering.
This method bypasses the need for a priori structural or bioinformatics information, enhancing applicability.
The approach holds significant potential for unlocking the full capabilities of directed enzyme evolution.