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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: Jul 30, 2025

Author Spotlight: Unveiling the Structural and Dynamic Aspects of Glycan Molecular Recognition

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Published on: May 17, 2024

Probing Substrate-Loaded Carrier Proteins by Nuclear Magnetic Resonance.

Neeru Arya¹, Kenneth A Marincin¹, Dominique P Frueh²

¹Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Methods in Molecular Biology (Clifton, N.J.)

|May 15, 2023

Summary

This study presents a novel nuclear magnetic resonance (NMR) method to stabilize substrate-loaded carrier proteins (CPs) within nonribosomal peptide synthetases (NRPSs). This technique overcomes hydrolysis challenges, enabling atomic-level studies of CP-domain interactions.

Keywords:

Carrier proteins In situ substrate loading Nonribosomal peptide synthetases Nuclear magnetic resonance Reaction monitoring

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Published on: November 2, 2018

Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Carrier proteins (CPs) are essential in nonribosomal peptide synthetases (NRPSs), interacting with catalytic domains and holding substrates.
Understanding CP-domain interactions is crucial for NRPS engineering, but substrate hydrolysis hinders studies.

Purpose of the Study:

To develop a protocol for studying substrate-loaded CPs at the atomic level using nuclear magnetic resonance (NMR) spectroscopy.
To overcome the challenge of labile thioester bond hydrolysis in CPs.

Main Methods:

Loading CPs in situ with adenylation domains within the NMR tube to achieve steady-state substrate loading.
Implementing controls and readouts to ensure sample integrity and sustained CP loading.

Main Results:

A method to counteract rapid hydrolysis of thioester bonds in CPs.
Enabling the study of substrate-loaded CPs at atomic resolution via NMR spectroscopy.

Conclusions:

The described protocol facilitates the study of substrate-loaded CPs, alone or with other domains.
This approach provides a foundation for obtaining kinetic, thermodynamic, dynamic, and structural parameters of CP-domain interactions.