computer-aided design of metal ion hosts
DESCRIPTION
Computer-Aided Design of Metal Ion Hosts. Benjamin P. Hay, 30 April 2003. U.S. Department of Energy Pacific Northwest National Laboratory. Battelle. The DOE Legacy - Radioactive Waste. Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003. Separations. - PowerPoint PPT PresentationTRANSCRIPT
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Computer-Aided Design of Metal Ion Hosts
Benjamin P. Hay, 30 April 2003
BattelleU.S. Department of EnergyPacific Northwest National Laboratory
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The DOE Legacy - Radioactive Waste
50 years of weapons production:
• Uranium Mining, Milling, and Refinement
• Isotope Separation (Enrichment)
• Fuel and Target Fabrication
• Reactor Operations
• Chemical Separations
• Weapons Component Fabrication
• Weapons Operations
• Research, Development, and Testing
400,000 m3 high-level nuclear waste220,000 m3 TRU waste3.3 million m3 low-level nuclear waste1.4 billion m3 environmental contamination
Data from “Linking Legacies”, DOE/EM-0319, January 1997
Bulk of radioactivity from metals:
Co-60, Sr-90,
Y-90, Tc-99,
Sm-131, Cs-137,
Ba-137, Eu-152,
Eu-154, Eu-155,
Ra-226, Th-230,
U-233, U-235,
U-238, Pu-238,
Pu-239, Pu-240,
Pu-241, Am-241,
Cm-244
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Separations
(1) Initial
(2) After mixing (3) After stripping
SOLVENT EXTRACTIONPROCESS
CC
CC
C CCCC
C C
CC
CCC
C C
CC
CC
C CCCC
(1) Initial
(2) After elution (3) After washing
ION
EXCHANGE
PROCESSC C CC C CC C CC C C
C CC C CC C CC C C
C C CC C CC C CC C C
C
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Sensors
ION SELECTIVE ELECTRODE
C C CC C C
V
CC
C C C C
PIEZOELECTRIC CRYSTAL DETECTOR
CCCCC
CC
C CCC
C
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Medical Applications
NH HN
N N
O O
OH
OO
HO
HNO
N
HO
O
Detoxification
actinide decorporating agent
N
N N
NO
HO
O
HO
O
OH
O
OH
Diagnostic Imaging
MRI image Gd contrast agent
NN N
O
HO
OOH
OOH
OOH
OOH
Chemotherapy - "Magic Bullets"
monoclonalantibody
linkerchelate
chelate used for Bi-213
M
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Hosts for metal ions
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
N N
O
OHO
HOO
OH
HO
O
N
N
N
N
NH
NH
HNO
HO
HO
O
O
HO
HO
OH
OH
R
R
R
O O
OO
OO
O
O
O
O
O
O
O
O O
O
O O O O
O O
R
R
R
R
O
O
O
O
O O
O
O
O
O
OO
OO
O
N HN
NH N
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Host Design
Computer-Aided ?
Guest complexation
Test Performance in actual application
Host synthesisIdentify
candidatestructures
Design criteria
Structural characterizationincluding X-ray analysis
Thermodynamic studies,Binding constant measurement
Computationalscreening
Molecularmodelingmethods
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Architecture - scaffolds used to connect sets of binding sites
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
N N
N N
N
N
N
N
Hg2+/Cu2+ = 5 Cu2+/Hg2+ = 104
OO
O
O O O
O OO
OOO
OO
OO
OO
OO
OO
OO
1010 106 105 103
Structure can have a large effect on binding affinity:
and a large effect on selectivity:
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Structural effects are often difficult to predict
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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How do we approach this problem?
O O
OO
O O
OOM+ Mn+
n+
O O
OO
O O
OOM+ M(OH2)6
n+
n+
OH2
OH2
+ 2 H2O
conformationalreorganization
metal ion complexation
+
free form binding form bound form
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Electronic structure calculations
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Force field calculations are much, much quicker
-40
-30
-20
-40 -30 -20M M k c a l / m o l
QM kcal/mol
0.05 Å
0.17 Å
0.19 Å
MM3 calculations take only 15 seconds/structure on a laptop computer
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Downside - MM models often require parameterization
ether donors
arene donors
High–level electronic structure calculations on simple analogs
Crystal structure data
0.29 Å
0.29 Å
0.25 Å0.23 Å
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Extending MM3 models for f-element complexes
HOPO[U(L)4(SCN)4]
amide
[Gd(L)(OH2)2]
0.19 Å0.14 Å
amine
[Pu(L)2(NO3)2]2+
0.25 Å
pyridine N-oxide
phosphine oxidecarboxylate
[Nd(L)(OH2)3]–
0.17 Å
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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What can we learn by examining host structures?
15-crown-5Na+
18-crown-6K+Li+
12-crown-4
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Binding site geometry in crowns favors large metals
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
Na+ K+Li+
bindingform
boundform
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Size–match is not sufficient for a good fit
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
good donororientation
bad donororientation
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12-crown-4 versus 14-crown-4
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Ligand strain energy
free
binding
bound
² U1
² U2
² Utot = ² U1 + ² U2
complex
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Binding affinity vs. host strain
2
4
6
8
10
12
14
16
0 2 4 6 8 10 12
1
23
4 5
6
7
8
OO
OO
OOO O
OOO
OO
OO
O OO
OOO
OO
O
OOO
O
O
O
OO
O O
O
O
2
OO
O
OO
O
OO
OO
OO
6
4
7 8
1 3
5
² Utot, kcal/mol
l o g K e q ( N a + c o m p l e x a t i o n )
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Another example
-25
-20
-15
-10
-5
60 70 80 905
O
O OO
ONH HN HNO
HO
HO
O O
OH
OH
OH
OH
N N NO
HO
HO
OO
OH
OH
OH
OH
NH
NH
HNO
HO
HO
O
O
HO
HO
OH
OH
R
R
R
1
234
R = HR = MeR = Et
l o g K e q ( F e 3 + c o m p l e x a t i o n )
² Utot, kcal/mol
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Actinide sequestering agents
P
O
OO
O
PUREX agent
Selective removal of Pu and U from spent fuel is done via solvent extraction:
Used at Hanford from 1956 through 1987
Currently used for reprocessing power reactor fuel in France, UK, Japan, and Russia.
P
OO
N
OO
N N
DIAMEX agent (Numatec)TRUEX agent (ANL/Eichrom)
Agents that also remove Am(III) and Cm(III):
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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A closer look at the malonamide architecture
optimal
orientation
free form
binding form
bound form
3.0 kcal/mol
2.5kcal/mol
5.5kcal/mol
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Improved architecture?
NN
OO
MeMe
H
H
NN
OO
MeMe
H
H
² Utot = 0.0 kcal/mol
² Utot = 0.1 kcal/mol
X-ray structure of [Eu(L)2(NO3)3]trans
cis
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Proof in the pudding . . .
10-6
10-4
10-2
100
102
104
0.0001 0.001 0.01 0.1 1
1
2NN
OO
NN
OO
1
2
Extraction into t-butylbenzene from aqueous solution
containing 1 M NaNO3, 1.5 mM HNO3, 0.1 mM
Eu(N03)3, and 1-µL of 155Eu tracer solution.
D E u
[ligand], mol•lit-1
10 million times more effective
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Structural design criteria
ether
amide
aryl ether
catecholate
arene
amine
HOPO
pyridine N-oxide
phosphine oxide
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Structural design is a trial–and–error process
Problem: you have to build structures before you can test them.
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Computer–Aided Host Design
Guest complexation
Test Performance in actual application
Host synthesisIdentify
candidatestructures
Design criteria
Structural characterizationincluding X-ray analysis
Thermodynamic studies,Binding constant measurement
Computationalscreening
Molecularmodelingmethods
StructureGenerator
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Structure-Based Drug Design
Known host structure• steric constraints• H-bond regions• hydrophobic regions
Step 1: Build candidate guests•position functional groups•link with spacer fragments
Step 2: Score the candidates•number of H-bonds•hydrophobic contact area•entropic factors•conformational strain energy
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Structure-based host design?
Li–O distance – 2.1 Å
6-coordinate Li+ complex
OLi
O
OLi
O
O Li
O
O
O
O+
OLi
O O
O
OLi
O O
O
OLi
O O
O
+ OLi
O
ether binding sites
O+O
Step 1: building Step 2: scoring
geometryevaluation
strain analysis
QM analysis
conformationalanalysis
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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HostDesigner Software
+
Objectives:
Score structures with respect to how well they complement the guest.
Build structures by connecting host fragments with linking fragments• examine all possible connectivities • examine all conformations for each connectivity
Do it quickly.
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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LINKER algorithm
(1) Define two host fragments
(2) Choose a potential link
(3) Bond 1st fragment to link
(4) Set dihedral angle on bond
(5) Bond 2nd fragment to link
(6) Set dihedral angle on bond
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Scoring by geometry
0.50 Å 4.50 Å 6.35 Å3.42 Å
6.84 Å 6.89 Å 7.64 Å
8.20 Å
6.59 Å
generates 81 structures from methylene linkage
finds only 9 unique structures rejected
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Linking fragment database
NULL
etc ...
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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CnHm for n = 0 - 6 (excluding alkynes, 3-membered rings, and 4-membered rings)
Menull
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Dimethylated 5– and 6–membered rings
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Selected fused–rings
cis/trans
cis/trans cis/trans
total: 20,094 linking structures
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Example of a LINKER run
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
1 2
3 4
5 6
Input:
Output: 1,242,037 host
structures in 8.0 sec
(MacOS, 800 MHz)
155,255 structures/sec ! ! !
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Validation
Are the structures generated by HostDesigner accurate?
optimize- M
optrmsd
Do the structures complement the metal ion?
- M
opt
optimize
² U
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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How did we do?
1 2
3 4
5 6
host
1
2
3
4
5
6
(Å)
0.12
0.11
0.09
0.08
0.10
0.11
(kcal/mol)
0.23
0.21
0.10
0.10
0.08
0.14
² Urmsd
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Second generation
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
1 2
3 4
2 x
Output: 5,802,532 host
structures in 39 sec
(MacOS, 800 MHz)
Input:
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OVERLAY algorithm
etc . . .
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Tetradentate ether macrocycles
0.3 kcal/mol
O
OO
O
O
OO
O
designed by computer
0.3 kcal/mol
O
OO
O R
RR
R
RR
R R
4.3 to 6.8 kcal/mol
designed by humans
R
O O
O O
7.7 kcal/mol
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Applications in progressCs, Sr, Ra – ethers, arenes
Dr. Bruce Moyer, ORNL
Actinides – amidesProf. Jim Hutchison, UO
Actinides - phosphoryl + N-oxidesProf. Robert Paine, UNM
Actinides -catecholatesProf. Ken Raymond, UC–Berkeley
++
+
+ +
+
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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HostDesigner software
ORNLBruce A. Moyer
U of OregonJames E. HutchisonTimothy J. R. WeakleyRobert D. Gilbertson
UC- BerkeleyKenneth N. Raymond
U of New MexicoRobert T. Paine
Structure-function research, scoring methods, and applications
PNNLTimothy K. Firman (PD)Bert deJongJohn B. Nicholas
SponsorsLDRD program, PNNL and the Office of Chemical Science, Basic Energy Sciences, Office of Science
PNNLCalvin C. AinsworthDave A. DixonDave FellerJorge Garza (VS)Gregg J. LumettaBrian M. RapkoJamal Uddin (PD)Rubi Vargas (PD)Cungen Zhang (PD)
EMSL - supercomputer
SponsorEnvironmental Management Science Program, Office of Science, Office of Environmental Management, Project Nos. 54679, 55087, 64974, 73759, 82773
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
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Further information
Benjamin P. Hay, Pacific Northwest National Laboratory, 30 April 2003
Hay, B. P.; Firman, T.K. “HostDesigner: A Program for the de Novo Structure-Based Design of Molecular Receptors with Binding Sites that Complement Metal Ion Guests.” Inorg. Chem. 2002, 41, 5502.
HostDesigner Software
http://hostdesigner.emsl.pnl.gov
Hay, B. P.; Hancock, R. D. Coord. Chem. Rev. 2001, 212, 61.
Lumetta, G. J.; Rapko, B. M.; Garza, P. A.; Hay, B. P.; Gilbertson, R. D.; Weakley, T. J. R.; Hutchison, J. E. J. Am. Chem. Soc., Comm. Ed. 2002, 124, 5644.
Amides
Ethers