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Related Experiment Video

Updated: Jun 6, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Published on: June 28, 2016

A high-resolution HCANH experiment with enhanced sensitivity via multiple quantum line narrowing.

G Larsson¹, S S Wijmenga, J Schleucher

¹Department of Medical Biochemistry and Biophysics, Umeå University, S 901 87, Umeå, Sweden.

Journal of Biomolecular NMR

|November 17, 2010

Summary

A new 3D constant-time HCANH (CTSL-HCANH) experiment enhances sensitivity and C(α) resolution in protein NMR. This method offers improved signal intensity for larger proteins, aiding sequential assignment without deuteration.

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Published on: December 8, 2016

Area of Science:

Biochemistry
Structural Biology
Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for determining protein structure and dynamics.
Standard NMR experiments like CBCANH and CBCA(CO)NH are effective but can be limited for larger proteins.
Improving sensitivity and resolution in NMR is essential for analyzing complex biological systems.

Purpose of the Study:

To introduce and validate a novel 3D constant-time HCANH (CTSL-HCANH) experiment.
To enhance sensitivity and C(α) (carbon-alpha) resolution in NMR spectroscopy.
To provide a complementary technique for sequential assignment of larger proteins.

Main Methods:

Development of the 3D constant-time HCANH (CTSL-HCANH) experiment utilizing multiple-quantum coherence.
Selective spin-locking of H(α) multiple quanta to suppress unwanted evolution and dephasing.
Application of the CTSL-HCANH experiment to calmodulin in complex with the SEF2-1 transcription factor binding domain.

Main Results:

The CTSL-HCANH experiment demonstrated increased sensitivity compared to standard HCANH experiments.
An average signal enhancement of 20% was observed on calmodulin complex.
Signal intensity was approximately twice as good compared to CBCANH, with outstanding C(α) resolution.

Conclusions:

The CTSL-HCANH experiment leverages favorable relaxation properties of multiple quanta for enhanced NMR sensitivity.
The method provides superior C(α) resolution, beneficial for protein structural studies.
CTSL-HCANH serves as a valuable complement to existing NMR techniques for sequential assignment of larger proteins, potentially reducing the need for deuteration.