student biophysics student seminar series introducing solid state nmr bo zhao zimeng li introduction...
TRANSCRIPT
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Biophysics Student Seminar Series
introducing
Solid State NMRBo Zhao
Zimeng Li
Introduction to NMR
Application
Solid State NMR
Research
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Introduction to NMR
Application
Solid State NMR
Research
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Physics
• Nuclear Magnetic Resonance
Biology
• Structure• Dynamics
Introduction to NMR
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Physical Origin
Measurement
Introduction to NMR
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• Rabi (1938)• Spin is internal property of particles• Spin can generate magnetic field• Protons and Neutrons have spin 1/2
Physical Origin
Xu, Modern Physics (1993)
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Physical Origin
Spin ½ System
Nuclei Unpaired Protons
Unpaired Neutrons
Net Spin γ (MHz/T) Abundance
1H 1 0 1/2 42.58 99.98%2H 1 1 1 6.54 0.0184%
14N 1 1 1 3.08 99.636%15N 1 0 1/2 -4.316 0.34%12C 0 0 0 N/A 99%13C 0 1 1/2 10.71 1%19F 1 0 1/2 40.08 100%31P 1 0 1/2 17.25 100%
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?
• External field – energy splitting
Spin ½ System
Hornak, The Basics of NMR (1997)
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1H [ppm]
• Internal property• External factor
– High Field (1964)– Electron shielding– Spin coupling
• Chemical Shift
Spin ½ System
?e
p
Spin coupling
Chemical Shift Anisotropy
Shi, NMR Introduction course (2003)Trausch et al., Chemical Physics Letters (2008)
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Spin ½ System
Chemical Shift Anisotropy
Dipole-Dipole coupling
𝜈
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• More shielding -> lower chemical shift.
Chemical Shift Anisotropy
𝜎 ↑ ,𝐵𝑒𝑓𝑓 ↓,𝜈↓
𝜎 𝑧𝑧
𝜎 𝑥𝑥
𝜎 𝑦𝑦
𝐵 h𝑠 𝑖𝑒𝑙𝑑
𝐵𝑒𝑓𝑓 =𝐵0−𝐵 h𝑠 𝑖𝑒𝑙𝑑
Rossum, Solid State NMR and proteins (2009)J. Duer, Solid State NMR spectroscopy (2002)
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• More shielding -> lower chemical shift.
• Dependent on angular orientation
More shielded
Chemical Shift Anisotropy
𝜎 ↑ ,𝐵𝑒𝑓𝑓 ↓,𝜈↓
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Spin ½ System
Chemical Shift Anisotropy
Dipole-Dipole Coupling
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Nuclear Pair Internuclear distance
Dipolar coupling
1H,1H 10 1201H,13C 1 301H,13C 2 3.8
• Dipolar coupling causes huge line broadening
Dipole-Dipole Coupling
J. Duer, Solid State NMR spectroscopy (2002)
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• (1952) Purcell and Bloch
Spin ½ System
Equilibrium
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Spin ½ System
Equilibrium
B0
B1 B1
Equilibrium
𝐵0
M
J. Duer, Solid State NMR spectroscopy (2002)
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𝜔=𝛾 ∙𝐵Spin ½ System
Goldstein, Classical Mechanics
𝑤0
𝐵0
M
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𝐵0
M
𝐵1
Spin ½ System
M • Resonance • Maximum signal
𝜔0
𝜔 h𝜈=ℏ𝜔
h𝜈0 h𝜈
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Physics Origin
Measurement
Introduction to NMR
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h𝜈
• Conventional – Continuous Wave• Modern – Pulse Signal
Measurement
𝐵0
𝜈
𝜈
Hornak, The Basics of NMR (1997)
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• Conventional – Continuous Wave• Modern – Pulse Signal
Measurement
𝐵0
𝜈
𝜈+𝛿
𝜈−𝛿
𝜈1𝐻−𝛿𝜈1𝐻𝜈1𝐻+𝛿
Anisotropy of 1H
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Measurement
Shi, NMR Introduction course (2003)
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Introduction to NMR
Application
Solid State NMR
Research
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• Protein 3D structure and function study at atomic resolution
• (1976) R. R. Ernst: Multi dimensional NMR• (1979) K. Wuthrich: Solve protein structure
Application
Markley, the Scientists – magazine of life science (2005)
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• Protein Dynamics/Protein folding intermediates
Application
A B ABk k
1 1,
Frank, et al. Nature (2010)
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• Fast structure determination/recognition of macromolecular compound
• Medical Imaging
Application
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Solid Solution
Dipolar Coupling (10-100kHz) Scalar Coupling (10-100Hz)
Anisotropic interactions Isotropic interactions
13C detection 1H detection
Sensitivity low Sensitivity high
Require special techniques to improve linewidth
Natural tumbling of molecules
Solution vs. Solid State NMR
Application
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Application
Introduction to NMR
Solid State NMR
Research
Problems
General Techniques
OS-NMR
MAS-NMR
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• Powder Spectra13C NMR of glycine
Problems with SSNMR
Adapted from M. Edén, Concepts in Magnetic Resonance 18A, 24.D. Lide, G. W. A. Milne, Handbook of Data on Organic Compounds: Compounds 10001-15600 Cha-Hex. (CRC Press, 1994).
Solid Liquid
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Problems with SSNMR
• Goal: simplify solid state spectra
Adapted from R. Tycko, Annu. Rev. Phys. Chem. 52, 575 (2001).
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Problems
General Techniques
MAS-NMR
Solid State NMR
OS-NMR
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• Developed in 1976• Suppresses 1H-1H and 1H-S coupling• Resolves dilute spins based on chemical
environment• Gives dipolar coupling information
Separated Local Field
R. K. Hester, J. L. Ackerman, B. L. Neff, J. S. Waugh, Physical Review Letters 36, 1081 (1976).
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• Hartmann-Hahn Condition– Detailed in 1962– Between heteroatoms– Same Larmor frequency
– Allows for cross relaxation
L. W. Jelinski, M. T. Melchior, Applied Spectroscopy Reviews 35, 25 (2004/05/24, 2004).
Cross Polarization
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• First published in 1973• Transfer population information from I to S• Detect off of dilute species
– Cleaner spectra– More sensitive
Cross Relaxation
Barth-Jan van Rossum: Solid-state NMR and proteins, a pictorial introduction
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Problems
General Techniques
MAS-NMR
Solid State NMR
OS-NMR
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Magic Angle Spinning
Simulating the “tumbling” of molecules
http://www.rs2d.com/english/images/protasis/doty/doty.jpg
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Magic Angle Spinning
• Proposed in 1958• Coupling dependent on
– At magic angle, 54.7356°, equals zero• Spin sample to decouple
– 1H-1H coupling ~40kHz
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E. R. Andrew, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences 299, 505 (March 18, 1981, 1981).
3.6kHz
Static
MAS decoupling
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Problems
General Techniques
MAS-NMR
Solid State NMR
OS-NMR
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Physical Orientation Lipids
Oriented Sample NMR
G. Orädd, G. Lindblom, Magnetic Resonance in Chemistry 42, 123 (2004).
C. R. Sanders, K. Oxenoid, Biochimica et Biophysica Acta (BBA) - Biomembranes 1508, 129 (2000).http://avantilipids.com
Replacing “tumbling” with Rf irradiation
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• Polarization Inversion Spin Exchange at the Magic Angle– Developed in 1994
• Form of SLF with enhanced sensitivity• Further suppression of 1H- 1H coupling
C. H. Wu, A. Ramamoorthy, S. J. Opella, Journal of Magnetic Resonance, Series A 109, 270 (1994).
PISEMA
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SLF
PISEMA
Modified SLF
PISEMA vs SLF
C. H. Wu, A. Ramamoorthy, S. J. Opella, Journal of Magnetic Resonance, Series A 109, 270 (1994).
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D. S. Thiriot, A. A. Nevzorov, S. J. Opella, Protein Sci 14, 1064 (Apr, 2005).
Polar Index Slant Angle Wheel
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S. Kim, T. A. Cross, Journal of Magnetic Resonance 168, 187 (2004).G. A. Cook, S. J. Opella, Methods Mol Biol 637, 263 (2010).
PISA Wheel
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Limitations of PISEMA
A. A. Nevzorov, S. J. Opella, Journal of Magnetic Resonance 185, 59 (2007).
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• Compliments PISEMA– Developed in 2003
• Averages out homonuclear spin-spin interaction• More uniform over wide range linewidths
A. A. Nevzorov, S. J. Opella, Journal of Magnetic Resonance 164, 182 (2003).
SAMMY
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Limitations of SAMMY
A. A. Nevzorov, S. J. Opella, Journal of Magnetic Resonance 185, 59 (2007).
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• Slight modification of SAMMY– Developed in 2007
• Combines pros of PISEMA and SAMMY– Sensitivity of PISEMA– Range of SAMMY
• Can be implemented generally
A. A. Nevzorov, S. J. Opella, Journal of Magnetic Resonance 185, 59 (2007).
SAMPI4
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Application
Introduction to NMR
Solid State NMR
Research
Sensitivity Enhancement
Spectroscopic Assignment
Structure Calculations
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• What is mosaic spread?
Reducing the effects of mosaic spread
Sensitivity Enhancement
C. R. Sanders, K. Oxenoid, Biochimica et Biophysica Acta (BBA) - Biomembranes 1508, 129 (2000).
M. J. Duer, Solid-state NMR spectroscopy: principles and applications. (Blackwell Science, 2001).
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A. A. Nevzorov, The Journal of Physical Chemistry B 115, 15406 (2011/12/29, 2011).
Sensitivity Enhancement
Static Slow diffusion Fast diffusion
Uniaxial Diffusion
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Sensitivity Enhancement
Spectroscopic Assignment
Structure Calculations
Research
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Spectroscopic Assignment
D. S. Thiriot, A. A. Nevzorov, S. J. Opella, Protein Sci 14, 1064 (Apr, 2005).
Assigning peaks in uniformly labeled proteins
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Spectroscopic Assignment
A. A. De Angelis, S. C. Howell, A. A. Nevzorov, S. J. Opella, Journal of the American Chemical Society 128, 12256 (2006/09/01, 2006).
R. W. Knox, G. J. Lu, S. J. Opella, A. A. Nevzorov, Journal of the American Chemical Society 132, 8255 (2010/06/23, 2010).
• Can identify coupling up to 6.7Å away
• Previous methods onlyidentify coupling < 5Å
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Sensitivity Enhancement
Spectroscopic Assignment
Structure Calculations
Research
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Determining structure from “shiftless” data
Y. Yin, A. A. Nevzorov, Journal of Magnetic Resonance 212, 64 (2011).
Structure Calculations
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C. H. Wu, S. J. Opella, J Chem Phys 128, 052312 (Feb 7, 2008).Y. Yin, A. A. Nevzorov, Journal of Magnetic Resonance 212, 64 (2011).
Structure Calculations
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Acknowledgement:• Dr. Sharon Campbell• Dr. Barry Lentz• Dr. Alexander Nevzorov
Thank you!
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• Why SSNMR is important?• What do you think the next development for
solid state NMR is?• Can you briefly compare the two major
structure determination techniques: NMR and X-ray crystallography?
Discussion Questions
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C. Glaubitz, A. Watts, Journal of Magnetic Resonance 130, 305 (1998).
MAOSS
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Compare methods of solving Protein Structure
Discussion
NMR X-ray Crystallography
No crystal needed Crystal
Can be used in solution Solid only
Not good for large proteins, smaller molecules are comparable to X-ray Generally higher solution
Can measure dynamics Stationary
In vivo possible (imaging) In vitro
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D. S. Thiriot, A. A. Nevzorov, S. J. Opella, Protein Sci 14, 1064 (Apr, 2005).
PISA Wheel