Related Experiment Video
Updated: Mar 23, 2026
06:53
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.8K
A dynamic duo: Copper metalloregulators and continuous-wave electron spin resonance spectroscopy
Alysia Mandato1, Sunil Saxena1, Sharon Ruthstein2
1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania.
Biophysical Reports
|March 21, 2026
Summary
Electron spin resonance (ESR) spectroscopy reveals distinct mechanisms in bacterial copper metalloregulators. It shows how metal binding influences protein dynamics and gene regulation strategies, highlighting diverse bacterial metal homeostasis.
Area of Science:
- Biochemistry
- Molecular Biology
- Biophysics
Background:
- Bacterial copper metalloregulators control gene expression in response to copper levels.
- Understanding their dynamics and metal coordination is crucial for bacterial survival and metal homeostasis.
Purpose of the Study:
- To review the application of continuous-wave electron spin resonance (ESR) spectroscopy.
- To investigate site-specific protein dynamics and metal coordination in bacterial copper metalloregulators.
- To elucidate distinct regulatory mechanisms employed by CueR and CsoR.
Main Methods:
- Continuous-wave electron spin resonance (ESR) spectroscopy.
- Analysis of protein dynamics and metal coordination.
- Comparative study of bacterial copper metalloregulators (CueR and CsoR).
Main Results:
- ESR provides direct insight into metal-induced conformational flexibility.
- CueR (activator) uses metal-induced conformational changes, not oligomerization, for transcriptional activation.
- CsoR (repressor) utilizes a dynamic equilibrium between dimeric and tetrameric states for its mechanism.
Conclusions:
- ESR spectroscopy effectively captures subtle structural and dynamical differences in metalloregulators.
- Bacterial copper metalloregulators employ diverse strategies for transcriptional regulation and metal homeostasis.
- Distinct mechanisms of CueR and CsoR highlight the adaptability of bacterial systems.
Related Concept Videos
01:20NMR Spectrometers: Overview
2.5K
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...
2.5K
01:12Double Resonance Techniques: Overview
836
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
836
01:17Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals
3.7K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
3.7K
01:20Atomic Emission Spectroscopy: Overview
4.2K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
4.2K
01:08NMR Spectroscopy: Spin–Spin Coupling
3.6K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.6K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
3.4K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.4K