Determination of the protein-ligand binding volume by high...
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Determination of the protein-ligand binding volume byhigh-pressure spectrofluorimetry
Vytautas Petrauskas
Department of Biothermodynamics and Drug DesignInstitute of Biotechnology, Vilnius University
February 15-17, 2016
Vytautas Petrauskas (Vilnius University) IMBP–8, Dortmund February 15-17, 2016 1 / 18
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Introductory remarksProtein-ligand binding (reaction) volume
Definition: the change in protein volume observed upon protein-ligandbinding;
Motivation: fundamental knowledge about protein-ligand interactionand pressure-induced protein denaturation.
Protein-ligand binding volume: ∆Vb =
(∂∆Gb
∂P
)T
;
Vytautas Petrauskas (Vilnius University) IMBP–8, Dortmund February 15-17, 2016 2 / 18
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Introductory remarksHeat shock protein 90 and carbonic anhydrases
N-terminal domain of human Hsp90(229 a.a.), PDB ID: 2YI6
Human carbonic anhydrase (CA) II(260 a.a.), PDB ID: 3HS4
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Experimental set-up of high-pressure spectrofluorimetry
Pressure range: (0.1 – 380) MPa;
Temperature range: (10 – 95) �;
Fluorescence probe: intrinsic tryptophan (exited at 295 nm);
Emission spectra range: (320 – 400) nm.
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Description of pressure-induced unfolding profilesEquations
Unfolding profiles:
f (p) = fN +fU − fN
1 + exp(∆G (p)/RT ).
The Gibbs energy of unfolding:
∆G = ∆G0 + ∆V0∆p +∆β
2(∆p)2.
The center of spectral mass:
λCSM =
∑i fiλi∑i fi
.
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Pressure-induced unfolding profiles of CA II and CA IIntrinsic tryptophan fluorescence spectra at various pressures
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The shift in Pm and dosing curvesFluorescent Pressure Shift Assay (FPSA)
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Description of dosing curvesMathematical background
Pt = Nf + Nb + U,
Lt = Lf + Nb,
KU =U
Nf,
Kb =Nb
Nf Lf.
Pt and Lt – the bulk concentrations of proteinand ligand;Nf and Nb – concentrations of native ligand-freeand bound protein;U – concentration of unfolded protein;KU and Kb– equilibrium constants of proteinunfolding and protein-ligand binding reaction;At melting pressure pm, U = Pt/2.
The final form of dosing curve equation:
Lt = (KU − 1)
(1
Kb
+Pt
2KU
)
Kb = exp
(−∆Gb
RT
)=
−∆G0b + ∆V0b(pm − p0) +
∆βb2
(pm − p0)2
RT
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Hsp90N protein stability diagram in P–T coordinatesWith added ligand
Petrauskas et al. Eur Biophys J 42 (2013) 355–362.
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Hsp90N protein stability diagramThe Gibbs energy dependence on pressure and temperature
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Binding volume correlation with affinityAffinity was determined by ITC and Fluorescent Thermal Shift Assay
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NMR experiments
Preliminary results of Hsp90N interaction with two ligands by NMR;
∆Vb =
(∂∆Gb
∂p
)T
;
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NMR data1H-15N–HSQC spectra of Hsp90N (red) and Hsp90N+ICPD9 (blue)
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NMR data analysisAnalysis of dosing curves
∆Vb =
(∂∆Gb
∂p
)T
∆Gb = −RT ln(Kb) = RT ln(Kd)
Experimental changes in chemical shifts:
∆δ =
√(δH0 − δH)2 +
(γN
γH
)2
(δN0 − δN)2
δ0 – chemical shift without ligand.
∆δ = ∆δmax(Lt + Pt + Kd) −
√(Lt + Pt + Kd)2 − 4PtLt2Pt
Chemical shift equation reference:
Morton et al. Structure 4 (1996) 705-14.
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Gibbs energy as a function of pressure
∆Gb = ∆Gb0 + ∆Vb0∆p +∆βb
2(∆p)2.
∆Gb0 = −20.7 kJ/mol∆Vb0 = 13 cm3/mol
∆βb = 0 cm6/(J mol)
∆Gb0 = −20.8 kJ/mol∆Vb0 = 20 cm3/mol
∆βb = 0.05 cm6/(J mol)
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Gibbs energy as a function of pressure
∆Gb = ∆Gb0 + ∆Vb0∆p +∆βb
2(∆p)2.
∆Gb0 = −20.7 kJ/mol∆Vb0 = 13 cm3/mol
∆βb = 0 cm6/(J mol)
∆Gb0 = −20.8 kJ/mol∆Vb0 = 20 cm3/mol
∆βb = 0.05 cm6/(J mol)
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Binding volume correlation with affinityIncluding NMR data (blue points)
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Concluding remarks
Our results suggest that weak ligands of Hsp90N protein inducesmaller changes in volume than tight-binding ligands.
Both techniques FPSA and NMR provide similar values of bindingvolume.
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Acknowledgments
High pressure team at the department ofBiothermodynamics and Drug Design:
Prof. Daumantas Matulis,Gediminas Skvarnavicius, Dr. Zigmas Toleikis,Joana Smirnoviene, Dr. Piotras Cimmperman,Martynas Grigaliunas, Povilas Norvaisas
NMR data:
Prof. Christian Roumestand (CBS Montpellier)
Funding:
Research Council of Lithuania (grant No.MIP-004/2014)
High-pressure team
Thank you for your attention!
Vytautas Petrauskas (Vilnius University) IMBP–8, Dortmund February 15-17, 2016 18 / 18
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Supplementary material
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FTSA and FPSA methodsExamples of Hsp90N protein stabilization by ligand against T and P denaturation
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FTSA and FPSA methodsExpressions for the Gibbs energy
f = fN +fU − fN
1 + exp(∆UG/RT )
∆UG as a function of temperature at a constant pressure:
∆UGT = ∆UG0 − ∆UCp
[T
(ln
T
T0− 1
)+ T0
]− (∆UH0 − ∆UG0)
(T
T0− 1
)
∆UG as a function of pressure at a constant temperature:
∆UGP = ∆UG0 + ∆UV0(p − p0) +∆Uβ
2(p − p0)2
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The Gibbs energy change
The full differential of the Gibbs energy change ∆G = GU − GN
d(∆G ) = −∆SdT + ∆Vdp
as a function of temperature T and pressure P.
∆G =∆β
2(p − p0)2 + ∆V0(p − p0) + ∆α(p − p0)(T − T0)−
∆Cp
[T
(ln
T
T0− 1
)+ T0
]− (∆H0 − ∆G0)
(T
T0− 1
)+ ∆G0
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Hsp90N protein stability diagram in P–T coordinatesWith added ligand
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Hsp90N stabilization by ligandsThe use of guanidine hydrochloride – a protein destabilizing agent
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Protein stabilization by ligandsHsp90N + radicicol
Hsp90N + radicicolPDB ID: 4EGK
Hsp90N melting temperatures Tm
[Hsp90N] = 14 µM
[Radicicol] µM Tm (�)
0 51.62 61.1
20 64.9
Zubriene et al. Int J Mol Sci 10 (2009)2662–2680.
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