introduction into solid-state nmr...barth-jan van rossum: solid-state nmr proton chemical shift...
TRANSCRIPT
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Introduction into
solid-state NMR
Barth van Rossum, 21.02.2011
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Barth-Jan van Rossum: Solid-State NMR
X-ray crystallography requires high-quality single crystal
à some systems notoriously difficult to crystallize…
typical solid-state NMR systems:
membrane-integrated receptors, aggregates, fibrils, intact organelles, (bio-)polymers...
Solid-state NMRno need for large well-ordered crystals or highly-purified proteins
works for immobilised proteins, no inherent limitation on complex size
à Solid-state MAS NMR very well-suited to study protein complexes that are difficult
to crystallize, insoluble or have tendency to aggregate.
Methods for structure determination (with atomic resolution)
rapid isotropic tumbling of the molecules
Solution-state NMRrequires rapid reorientation of soluble biomolecules
à Difficult to study proteins that either are large (> 50 kDa) or form
large complexes (aggregates, fibrils, membrane proteins)
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Barth-Jan van Rossum: Solid-State NMR
proton chemical shift (ppm)
solid-state NMRno magic angle spinning no 1H-1H decoupling liquid-state NMR
solids-state NMR vs. liquid-state NMR
100 80 60 40 20 0 -20 -40 -60 -80
5,000 Hz
40,000 Hz
dipolar coupling between protons:
~ 120 kHz @ 1.0 Å~ 40 kHz @ 1.5 Å
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Barth-Jan van Rossum: Solid-State NMR
solids-state NMR vs. liquid-state NMR
1 KW
720,844 mm3
(1 mW / mm3)
67 mm3
(15 W / mm3)
Solid-state NMR uses high-power RF pulses (1000 W) to manipulate the spins
5,000 Hz
15 mm3
(70 W / mm3)
Solid-state NMR is brute force…
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Barth-Jan van Rossum: Solid-State NMR
tumbling rate
spectralcrowding
complex size versus protein size
solids and liquids:
à protein size determines spectral crowding
liquids:
à complex size determines tumbling rate
‘no inherent limitation on complex size’ : What does it mean?
Methods for structure determination (with atomic resolution)
SH3 domain62 residues (~7 kDa)
OmpG281 residues (~34 kDa)
solids:
à no upper limit for complex size
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Barth-Jan van Rossum: Solid-State NMR
MAS mimics orientation averaging in liquids
by imposing a collective reorientation of all
molecules around a special axis
à “tumbling rate” not dependent on size
Magic-Angle Spinning (MAS)
what’s more:
- without MAS, only single crystals give a
high solid-state NMR resolution
- with MAS, you do not need crystals
However, it helps to have some sort of local
order …
tumbling rate
spectralcrowding
complex size versus protein size
drive
bearing
Magic-Angle Spinning (MAS)
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Barth-Jan van Rossum: Solid-State NMR
What are ‘good’ MAS NMR samples?
For MAS NMR, you do not need crystals
However, it helps to have some sort of local order
non-ordered solid: each molecule (protein) in a different chemical environment
(identical spins experience different ‘local field’)
à broadening of the NMR lines
NAV(micro-crystalline)
QIY(lyophilized)
non-ordered
ordered
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Barth-Jan van Rossum: Solid-State NMR
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ppm
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Barth-Jan van Rossum: Solid-State NMR
ppm
X-ray: long-range order required,
single-crystals required
MAS NMR: no long-range order required,
- short-range order sufficient
- non-crystallographic symmetries
Ordered system provides better NMR
resolution. But: no need for crystals in
the ‘classical’ sense
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Barth-Jan van Rossum: Solid-State NMR
systems with high native
symmetry not good enough
for X-ray crystallography
- non-crystallographic
symmetry
- rotation symmetry
- combination of rotation and
translation: helical symmetry
X-ray crystallography
requires unit-cell that
repeats in all directions
and is related by
translation symmetry only
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Barth-Jan van Rossum: Solid-State NMR
175180 ppm
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70 65 60 55 50 45 40 35 30 25 20 15 10 ppm
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LH2-complex: ~150 kDa9 protein units (in total 846 AA)+ pigments (BChl a and carotenoid)
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Barth-Jan van Rossum: Solid-State NMR
“unshielded”
“shielded”
Electrons shield the nuclear spins from the external magnetic field
Chemical shift anisotropy (CSA)
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Barth-Jan van Rossum: Solid-State NMR
solids: interactions depend on orientation of molecule
these interactions are called anisotropic
à limit resolution in NMR spectra of biological macromolecules
liquids: rapid random tumbling averages
anisotropic chemical shifts and couplings
Chemical shift anisotropy (CSA)
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Barth-Jan van Rossum: Solid-State NMR
Chemical shift anisotropy (CSA)
axial symmetry
molecule perpendicular to B0 à maximum deshielding
molecule parallel to B0 à maximum shielding
non-axial symmetry
shielding is different in all three dimensions
spherical symmetry
shielding is similar in all three dimensions, CSA ~ 0
HCCH
H C C H
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Barth-Jan van Rossum: Solid-State NMR
Chemical shift anisotropy (CSA)spherical symmetry
σ11 = σ22 = σ33
axial symmetry
σ11 = σ22 (or)
σ22 = σ33
non-axial symmetry
σ11 = σ22 = σ33
σ11 = σ22σ11,σ22 < σ33
σ22 = σ33σ22,σ33 > σ11
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Barth-Jan van Rossum: Solid-State NMR
Chemical shift anisotropy (CSA)
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Barth-Jan van Rossum: Solid-State NMR
drive
bearing
Magic-Angle Spinning (MAS)
Magic-Angle Spinning (MAS)
σiso
Anisotropic interactions can be suppressed using a
technique called magic-angle spinning
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Barth-Jan van Rossum: Solid-State NMR
Magic-Angle Spinning (MAS)
“magic angle” : the angle between the body diagonal of a cube and the z-axis
à by rotation around this axis, a vector along z will cross the x and y-axes
54.7°
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Barth-Jan van Rossum: Solid-State NMR
Magic-Angle Spinning (MAS)
note : for any rotation, one could construct a 1x1x1 cube around…
à however, the z-axis is ‘special’ (B0 direction!) and has to be one of the axes