1. molecular weight distribution analysismolecular weight
TRANSCRIPT
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1 Molecular weight distribution analysis –1. Molecular weight distribution analysis SEC MALLs and AUC
2. Conformation and flexibility – Viscometry, AUC Light scatteringAUC, Light scattering
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L t 4 A l ti l Ult t if ti ILecture 4. Analytical Ultracentrifugation I: Molecular weight and conformation
Steve Harding
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Molecular weight: analytical ultracentrifugation
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1. Molecular weight and molecular weight di t ib ti l idistribution analysis
2 C f ti d fl ibilit l i2. Conformation and flexibility analysis- general (rods, spheres, coils etc)- polymer flexibility- polymer flexibility- protein conformation: ellipsoids and beadmodels
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Analytical ultracentrifugaton:
Sedimentation Velocity
Sedimentation EquilibriumVelocity Equilibrium
Centrifugal force
Air SolventTop view, sector ofcentrifuge cell
Centrifugal force Diffusion
Solution
conc c STEADY STATEconc, c
Rate of movement ofboundary sed. coeff
conc, c STEADY STATEPATTERN
FUNCTION ONLY O O Gdi t
distance, r
OF MOL. WEIGHT PARAMETERS
distance, r
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Extraction of Mw,app from sedimentation equilibrium and “MSTAR” analysis
Chitosan G213
Mw,app
cell bottom
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Extraction of Mw,app from sedimentation equilibrium and “MSTAR” analysis
xanthan
Mw= (5.9+1.1)x106g/mol
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SEC - sedimentation equilibriumSEC sedimentation equilibrium
mol. wt distribution: alginateg
Ball A, Harding SE & Mitchell J, Int. J. Biol. Macromol., 1988
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Sedimentation Velocity
Sedimentation EquilibriumVelocity Equilibrium
Centrifugal force
Air SolventTop view, sector ofcentrifuge cell
Centrifugal force Diffusion
Solution
conc c STEADY STATEconc, c
Rate of movement ofboundary sed. coeff
conc, c STEADY STATEPATTERN
FUNCTION ONLY O O Gdi t
distance, r
OF MOL. WEIGHT PARAMETERS
distance, r
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Guar, 0.75 mg/ml
Sedimentation “g(s*) plot”:
f l i f th hfrom analysis of the change with time of the whole concentration profile
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Sedimentation velocity g*(s) plot: starch
Tester R, Patel T, Harding, S. Carbohydrate Research, 2006
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Multi-Gaussian fit estimates proportions of each p pspecies too:
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Converting a sedimentation coefficient distribution to a molecular weight distribution g
s20 w ~ Mb
Harding, S. Adv. Carb. Chem. Biochem, 1989
20,w
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Converting a sedimentation coefficient distribution to a molecular weight distribution g
Molecular weight distribution – no column or membrane needed
s20 w ~ Mb (b=0.5)
Harding, S. Adv. Carb. Chem. Biochem, 1989
20,w ( )
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Converting a sedimentation coefficient distribution to a molecular weight distribution g
Glycoconjugate vaccine – too large for SEC-MALLs analysisGlycoconjugate vaccine too large for SEC MALLs analysis
s20,w ~ Mb
Harding, S., Abdelhameed, A., Morris, G. (2010)
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1. Molecular weight and molecular weight di t ib ti l idistribution analysis
2 C f ti d fl ibilit l i2. Conformation and flexibility analysis- general (rods, spheres, coils etc)- polymer flexibility- polymer flexibility- protein conformation: ellipsoids and beadmodels
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8
Citrus pectin
7
8 2.49 mg/ml s = 1.21 S 2.04 mg/ml s = 1.36 S 1.40 mg/ml s = 1.49 S 1.13 mg/ml s = 1.56 S
5
6
1 ) 0.79 mg/ml s = 1.61 S 0.23 mg/ml s = 1.99 S
4
5
fring
es s
-
2
3
ls-g
(s) (
f
1
2
0 1 2 3 40
Sedimentation coefficient (Svedberg)
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12
so20,w and ks extraction
8.0x1012
8.5x1012
s020,b = 2.04 (0.07) S
ks = 270 (25) mlg-1
7.0x1012
7.5x1012
6.5x1012
7.0x10
Sved
berg
-1)
slope=ks/so20,wse
c-1
5.5x1012
6.0x1012
1/s (
S1/
s 20,
w
4 5x1012
5.0x1012
1/so20,w
0.0 5.0x10-4 1.0x10-3 1.5x10-3 2.0x10-3 2.5x10-34.5x10
Concentration (gml-1)Concentration g/mlg
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General conformation analysis: the Haug Triangle
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Power law, “Scaling” or “MHKS” relations:
Sphere Rod Coil[η] ~ M0 [η] ~ M1.8 [η] ~ M0.5-0.8[η] [η] [η]
so20 w ~ M0.67 so
20 w ~ M0.15 so20 w~ M0.4-0.5
20,w 20,w 20,w
Rg ~ M0.33 Rg ~ M1.0 Rg ~ M0.5-0.6g g g
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Mark-Houwink-Kuhn-Sakurada Power law plot
Galactomannans a=0.74+0.01
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Change in Conformation
Rollings, 1992
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Conformation Zoning:
Zone A: Extra-rigid rod: schizophyllan
Zone B: Rigid Rod: xanthanxanthan
Zone C: Semi-flexible coil:Zone C: Semi flexible coil: pectin
Zone D: Random coil: dextran, pullulan
Zone E: Highly branched: amylopectin, glycogenamylopectin, glycogen
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Conformation Zoning:
3.0
3.5
3.0
3.5
2.5A
B2.5
A
B
1.5
2.0
011k sM
L) C1.5
2.0
011k sM
L) C
1.0log
(10-
D1.0log
(10-
D
0.0
0.5
E0.0
0.5
E
0.5 1.0 1.5 2.0 2.5-0.5
0.5 1.0 1.5 2.0 2.5-0.5
Pavlov, Rowe & Harding, Trends inAnalytical Chemistry,1997
log (1012[s]/M L)log (1012[s]/M L)
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3.5
3.0A
Bovine glycogen ●
Pectins ■
Pullulans ▲
2 0
2.5A
B
1.5
2.0
0-11 k sM
L)
C
0 5
1.0log
(10
D
0.0
0.5
E
0.5 1.0 1.5 2.0 2.5-0.5
log (1012[s]/ML)
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Worm-like Chain
Flexibility parameter: Persistence length LFlexibility parameter: Persistence length Lp
Contour Length
Kuhn-statistical length λ-1 = 2Lp
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Worm-like Chain
Flexibility parameter: Persistence length LFlexibility parameter: Persistence length Lp
Theoretical limits: Random coil L = 0Theoretical limits: Random coil Lp 0Rigid rod Lp = infinity
Practical limits: Random coil Lp ~ 1-2nmRigid rod L 200nmRigid rod Lp ~ 200nm
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“Bushin-Bohdanecky” relation
[ ]2/1
2/13/1
03/1
0
3/12 2w
pL
w MML
BMAM
−
−−⎟⎟⎠
⎞⎜⎜⎝
⎛Φ+Φ=⎟⎟
⎠
⎞⎜⎜⎝
⎛η[ ] LM ⎟
⎠⎜⎝
⎟⎠
⎜⎝ η
“Yamakawa-Fujii” relation
( )⎥⎥⎤
⎢⎢⎡
+⎟⎟⎠
⎞⎜⎜⎝
⎛++⎟
⎟⎠
⎞⎜⎜⎝
⎛×
−=
−
....22
843.13
12/1
32
2/1
00 wwL
LMM
AALM
MNvM
sπη
ρ⎥⎦
⎢⎣
⎟⎠
⎜⎝
⎟⎠
⎜⎝ 223 0 pLpLA LMLMNπη
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Global “Hydfit” plot: xyloglucan
800
700
800
600
700
500
600
. nm
-1)
400
500
(g. m
ol-1
.
300
400
ML
200
300
2 4 6 8 10 12 14 16 18 20200
Lp (nm)Patel et al, Carbohydrate Polymers, 2007
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C b h d P l L ( )Flexibilities of
b h d t l Carbohydrate Polymer Lp (nm)Pullulan 1.2-1.9
carbohydrate polymers
Amylose 2.8
Pectin (69% esterified) 12 15Pectin (69% esterified) 12-15
Pectin (0% esterified) 34
DNA 45
Schizophyllan 115-200p y
Scleroglucan 180+30
Xanthan 210
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Protein conformation: ellipsoids and beads
Software htt // tti h k/ h
Softwarehttp://leonardo inf um es/macromolhttp://www.nottingham.ac.uk/ncmh
Ellips1 (ellipsoids of revolution)Ellips2, Ellips3, Ellips4 (general ellipsoids)
http://leonardo.inf.um.es/macromolHydro, Solpro, HydroProellipsoids) HydroPro
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Ellipsoid axial ratio determinations – wheat protein gliadins
Structure and heterogeneity of gliadin: a hydrodynamic evaluation
S. Ang et al, Eur. Biophys. J. (2009)
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Ellipsoid axial ratio determinations – wheat protein gliadins
Structure and heterogeneity of gliadin: a hydrodynamic evaluation
S. Ang et al, Eur. Biophys. J. (2009)ELLIPS1
tti h k/ hwww.nottingham.ac.uk/ncmh
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Demonstration of ELLIPS1 & ELLIPS2 programs:p g
download from http://www.nottingham.ac.uk/ncmh
For a wide variety of hydrodynamic parameters including ν(from intrinsic viscosity)– see Lecture 1 notes or P (from(from intrinsic viscosity) see Lecture 1 notes or P (from sedimentation or diffusion measurements) – see Lecture 3 notes:
ν = [η] /vs
P = (f/fo). (v/vs)1/3( o) ( s)
where (f/fo) = (k BT/6πηo){(4πN A/3vM)1/3 }/Do20,w
= (M(1-vρ )/NA6πη ){(4πNA/3vM)1/3 }/so20 (M(1 vρo)/NA6πηo){(4πNA/3vM) }/s 20,w
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For more complicated shapes:BEAD & SHELL MODELSHydro, Solpro, HydroPro etc
http://leonardo.inf.um.es/macromol/
IgEIgE
IgG1
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Follow up bibliography:
1. Serydyuk, I.N., Zaccai, N.R. and Zaccai, J. (2006) Methods in Molecular Biophysics Cambridge Chapters D1 and D4Molecular Biophysics, Cambridge, Chapters D1 and D4
2. Harding, S.E., Rowe, A.J. and Horton, J.C., Eds (1992) Analytical Ultracentrifugation in Biochemistry and Polymer Science RoyalUltracentrifugation in Biochemistry and Polymer Science, Royal Soc. Chem. Cambridge
3. Scott, D.J. et al (2005) Analytical Ultracentrifugation. Techniques and Methods, Royal Soc. Chem. Cambridge
4. Harding, S.E. & Johnson, P.J. (1985) The concentration d d f l l t Bi h J 231 543dependence of macromolecular parameters, Biochem. J. 231, 543-547
5 Harding S E (1995) On the hydrodynamic analysis of5. Harding, S.E. (1995) On the hydrodynamic analysis of macromolecular conformation. Biophys Chem 55, 69-93
6. Garcia de la Torre et al (1997) SOLPRO: theory and computer ( ) y pprogram for the prediction of SOLution PROperties of rigid macromolecules and bioparticles. Eur. Biophys. J. 25, 361-372