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Updated: Jul 19, 2026

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale
Published on: April 19, 2021
Proton-proton Overhauser NMR spectroscopy with polypeptide chains in large structures.
Reto Horst1, Gerhard Wider, Jocelyne Fiaux
1Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland.
Nuclear Overhauser Effect (NOE) NMR experiments can determine the structure of large protein complexes. Optimal mixing times allow accurate measurements regardless of size or motion.
Area of Science:
- Biochemistry
- Structural Biology
- Nuclear Magnetic Resonance (NMR) Spectroscopy
Background:
- Nuclear Overhauser Effect (NOE) is a key NMR technique for determining inter-proton distances.
- Studying large protein complexes in solution presents challenges for traditional NOE methods.
- Uniformly deuterated polypeptide chains are often used in NMR studies of large biomolecules.
Purpose of the Study:
- To investigate the applicability of 1H-1H NOE for structural studies of large, uniformly deuterated polypeptide chains.
- To analyze the influence of molecular size and rotational dynamics on NOE signal intensity.
- To establish the feasibility of using advanced NMR techniques for large macromolecular assemblies.
Main Methods:
- Model calculations and NMR experiments were employed to study 1H-1H NOE.
- Analysis of magnetization evolution under slow-motion conditions.
- 1H-1H NOE buildup measurements on a GroEL-GroES complex (472 kDa).
- Application of multidimensional NOESY with cross-correlated relaxation-enhanced polarization transfer and transverse relaxation-optimized spectroscopy (TRACT and TROSY).
Main Results:
- Maximal 1H-1H NOE transfer is independent of rotational correlation time when mixing time is optimized.
- This independence holds even with chemical exchange with bulk water.
- Successful application of advanced NOESY experiments to a 472-kDa GroEL-GroES complex.
- Demonstrated applicability to structures up to several hundred kilodaltons.
Conclusions:
- 1H-1H NOE is a viable technique for structural studies of large protein assemblies.
- Optimized mixing times are crucial for accurate NOE measurements in large systems.
- Advanced NMR techniques enable structural insights into large macromolecular complexes in solution.
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