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Updated: May 9, 2026
08:55
High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
Published on: October 9, 2020
Sensitivity and resolution enhanced solid-state NMR for paramagnetic systems and biomolecules under very fast magic
Sudhakar Parthasarathy1, Yusuke Nishiyama, Yoshitaka Ishii
1Department of Chemistry and ‡Center for Structural Biology, University of Illinois at Chicago , Chicago, Illinois 60607, United States.
Accounts of Chemical Research
|July 30, 2013
Summary
Fast magic angle spinning (MAS) solid-state NMR (SSNMR) dramatically improves resolution and sensitivity for paramagnetic systems and biomolecules. Very fast MAS (VFMAS) and paramagnetic-assisted condensed data collection (PACC) enable microgram-scale analysis and routine protein studies.
Area of Science:
- Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
- Paramagnetic Systems and Biomolecular Analysis
- Advanced Spectroscopic Techniques
Background:
- Fast magic angle spinning (MAS) has significantly advanced solid-state NMR (SSNMR) for biomolecules and materials.
- High-resolution (1)H and (13)C SSNMR of paramagnetic systems and biomolecules face challenges in sensitivity and resolution.
Purpose of the Study:
- To summarize recent developments in fast MAS methods for SSNMR.
- To present (13)C and (1)H SSNMR studies on paramagnetic systems and biomolecules using very fast MAS (VFMAS).
- To highlight the application of VFMAS and paramagnetic-assisted condensed data collection (PACC) for enhanced sensitivity and resolution.
Main Methods:
- Employing very fast MAS (VFMAS) at spinning speeds of at least 20 kHz for (1)H and (13)C SSNMR.
- Utilizing fast recycling with short (1)H T1 values for microgram-scale analysis of paramagnetic systems.
- Combining VFMAS with paramagnetic doping (e.g., Cu-EDTA) and PACC for enhanced (1)H T1 relaxation in biomolecular SSNMR.
- Acquiring (13)C SSNMR data at ultrahigh magnetic fields (750-800 MHz).
Main Results:
- VFMAS at ≥20 kHz enhanced sensitivity and resolution of (1)H and (13)C SSNMR for paramagnetic systems by orders of magnitude.
- VFMAS at >40 kHz improved sensitivity and resolution for (13)C biomolecular SSNMR, with low-power (1)H decoupling providing excellent spectral resolution.
- PACC approach with paramagnetic doping enabled extremely fast recycling, demonstrated with (13)C-labeled ubiquitin.
- Preliminary data on Aβ amyloid fibrils and GB1 microcrystals suggest potential for routine multidimensional SSNMR of proteins at 50-200 nmol levels using PACC and ultrahigh fields.
Conclusions:
- VFMAS significantly overcomes limitations in high-resolution (1)H and (13)C SSNMR of paramagnetic systems.
- The PACC approach combined with VFMAS and ultrahigh fields shows promise for sensitive and routine multidimensional SSNMR analysis of biomolecules.
- Future prospects include studying biomolecules using (13)C SSNMR under ultrafast MAS (∼100 kHz).
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