peter siman v.5
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Cross Talk Within Chemistry Disciplines
Dr. Peter Siman1
Peter Siman
2
Prof. Ashraf Brik
Nat. Chem. Biol. (2014)
Angew. Chem. Int. Ed. (2013)
Cell Reports (2013)
Chem. Sci. (2013)
Org. Lett (2012)
Org. Biomol. Chem. (2012)
ChemBioChem (2011).
ChemBioChem (2010)
Prof. Daniel Cohn
Biodegradable Polymerizable Adhesive
Compositions Comprising Cyanoacrylate
Monomers, WO-2010026590 (2009)
B.Sc. & M.Sc.
in Chemistry
Ph.D.
in Chemistry
3
Disease Related Aggregative Proteins
http://www.humpath.com/spip.php?article1586
4
New Tools for the Synthesis and Manipulation of
Aggregative Proteins
1) Difficulty in expression or synthesis
2) Lack of tools to control aggregation initiation
3) Complexity and variability in the aggregation processes
4) Difficulties in structural characterization
5) Difficulties in real time monitoring of aggregation
6) Unknown “hot spots” in the protein sequence
5
HIV-1 Rev
• A116 amino acid (13kDa) regulator
of expression of viral protein (Rev)
• Rev is a basic protein (pI 9.2) i.e.
positively charged binds RNA
• Rev specific RNA-binding protein
• Rev aggregates within 8 hours after
expression
M. A. DiMattia, et. al., Proc. Natl. Acad. Sci. 2010, 107,
5810-5814..
A. Dayton, Retrovirology 2011, 8, 62
V. W. Pollard, M. H. Malim, Annu. Rev. Microbiol.
1998, 52, 491-532
6
Total Synthesis of HIV-1 Rev from Three Fragments
P. Siman, O. Blatt, T. Moyal, T. Danieli, M. Lebendiker, H. A. Lashuel, A. Friedler, A. Brik, ChemBioChem 12, 1097-1104 (2011)
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Racemization at Middle Fragment C-terminus (Serine)
P. Siman, O. Blatt, T. Moyal, T. Danieli, M. Lebendiker, H. A. Lashuel, A. Friedler, A. Brik, ChemBioChem 12, 1097-1104 (2011)
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Racemization at Middle Fragment C-terminus (Serine)
P. Siman, O. Blatt, T. Moyal, T. Danieli, M. Lebendiker, H. A. Lashuel, A. Friedler, A. Brik, ChemBioChem 12, 1097-1104 (2011)
9
Racemization Free Synthesis of Middle Fragment
Challenges
P. Siman, O. Blatt, T. Moyal, T. Danieli, M. Lebendiker, H. A. Lashuel, A. Friedler, A. Brik, ChemBioChem 12, 1097-1104 (2011)
P. E. Dawson, et. al., Angew. Chem. Int.
Ed. 2008, 47, 6851-6855.
HPLC trace of Dbz activation
DCM
DMF
DCM, the conventional solvent causes aggregation of the peptide
DMF preserves the peptide, but causes the addition of 28 Da
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NMR Study of the 28 Da Reveals Vilsmeier-Haack Reaction
P. Siman, O. Blatt, T. Moyal, T. Danieli, M. Lebendiker, H. A. Lashuel, A. Friedler, A. Brik, ChemBioChem 12, 1097-1104 (2011)
Proposed Mechanism of Dbz activation in DMF through Vilsmeier-Haack
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Correctly Folded HIV-1 Rev Protein was Obtained Using Dbz
Approach
Circular Dichroism spectrum of recombinant Rev (A) and synthesized
Rev (B)
P. Siman, O. Blatt, T. Moyal, T. Danieli, M. Lebendiker, H. A. Lashuel, A. Friedler, A. Brik, ChemBioChem 12, 1097-1104 (2011)
T. Moyal,1 H. P. Hemantha,1 P. Siman, M. Refua and A. Brik, Chem. Sci., 4, 2496-2501, (2013)
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Towards the Synthesis of Huntington Protein
N. V. Dokholyan, et. al., PLoS. Comput. Biol., 2010, 6, e1000772.
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Native Chemical Ligation at γ-mercapto-Glutamine
P. Siman, S. V. Karthikeyan, A. Brik, Org. Lett. 2012, 14, 1520-1523
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Chromatin & Histones
http://www.youtube.com/watch?v=eYrQ0EhVCYA
1. R. D. Kornberg, et. al., Science 1974, 184, 865-868.
2. R. Sperlinget. al., Biochemistry (Mosc). 1975, 14, 3322-3331.
3. Y. J. Jin, et. al., J. Biol. Chem. 1986, 261, 15805-15812.
4. A. D. Baxevanis, et. al., Biochemistry (Mosc). 1990, 29, 973-976.
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Lysine (34) Ubiquitinated H2B Protein
• Ubiquitination (Ub) of H2B at Lysine 34, was found to directly regulate
the methylation of Histone 3 (H3), which signals for DNA repair.
• Up to date, no report on neither the isolation nor production of K34-Ub-
H2B using other methods
L. Wu et al. , Mol. Cell, 43, 132-144 (2011)
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Total Synthesis of K34 Ubiquitinated H2B Protein
Siman P., Karthikeyan S. V., Nikolov M., Fischle W. and Brik A.* Angew. Chem. Int. Ed. 52, 8059-8063, (2013)
Shema-Yaacoby E.,# Nikolov M.,# Haj-Yahya M., Siman P., Allemand E., Yamaguchi Y., Muchardt C., Urlaub H., Brik A., Oren M.* and
Fischle W.* Cell Reports 4, 601-608, (2013)
MW= 24 kDa
256 chemical
reactions
Post-doc at the Yaghi Group
17
Siman P., Trickett C., Furukawa H., and Yaghi O. M., Chem. Commun., 2015, 51, 17463-17466.
Fracaroli A. M., Siman P., Nagib D. A., Suzuki M., Furukawa H., Toste F. D., and Yaghi O. M., J. Am. Chem. Soc.,
2016, 138 (27), pp 8352–8355.
Precise Control of Pore Environment Through Peptidic Linker
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M+
Single Crystal (SC) Synthesis Using Methanol
Siman P., Trickett C., Furukawa H., and Yaghi O. M., Chem. Commun., 2015, 51, 17463-17466
Crystallographic Data of As-synthesized MOF-705
and MOF-706
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Sample MOF-705_as MOF-705_sc MOF-706_as MOF-706_sc
Chemical Formula C17 H18 N2 Na4 O12 C33.08 H33.70 N4 Na8 O25.71 C22.5 H18 N2 Na4 O12 C22.25 H19.25 N2 Na4 O11.5
Formula mass 534.29 1082.58 618.87 590.61
Crystal system monoclinic monoclinic monoclinic monoclinic
Space group P21 P21 P21 P21
[Å] 1.54178 0.77490 0.88560 1.03330
a [Å] 11.8894(4) 24.0448(19)a 12.0790(15) 11.9807(16)
b [Å] 5.2299(2) 5.2432(5) 5.2419(6) 5.2345(6)
c [Å] 17.4663(5) 16.9833(14) 21.254(3) 21.796(3)
β (degrees) 97.279(2) 103.366(6) 103.886(6) 99.274(10)
Z 2 2 2 2
V [Å3] 1077.3(1) 2083.1(3) 1306.4(3) 1349.1(3)
T [K] 100(2) 100(2) 100(2) 100(2)
density [g cm-3] 1.647 1.726 1.573 1.454
measured
reflections 23262 18857 7646 6359
unique reflections 4415 4815 1594 1980
parameters 334 623 327 345
restraints 34 19 106 130
Rint 0.0889 0.1078 0.1134 0.1002
range (degrees) 2.55 - 74.52 2.568 - 23.539 2.164 - 21.724 2.504 - 28.238
R1, wR2 0.0415, 0.0965 0.0684, 0.1878 0.0721, 0.2093 0.1176, 0.3174
S (GOF) 1.037 1.009 1.007 1.273
max / min res.
dens. [e Å-3] 0.366 / -0.241 0.692 / -0.346 0.535 / -0.457 0.732 / -0.673 a the unit cell is doubled due to superstructure in which water and methanol coordinate to Na(4)
Both MOFs Are Stable Upon Activation and Under Ambient
Conditions
21Siman P., Trickett C., Furukawa H., and Yaghi O. M., Chem. Commun., 2015, 51, 17463-17466
Higher Uptake of CO2 over N2 at 0 and 25 ºC
22Siman P., Trickett C., Furukawa H., and Yaghi O. M., Chem. Commun., 2015, 51, 17463-17466
CO2 and N2 isotherms for MOF-705. Filled and open
symbols represent adsorption and desorption branches
respectively
N2 isotherms are in orange (273 K) and green (298 K),
CO2 isotherms are in blue (273 K) and red (298 K).
Seven Post-synthetic Covalent Reactions in Tandem
Leading to Enzyme-like Complexity within Metal–Organic
Framework Crystals
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(a) Catalytic cleavage of pentapeptide 1 by Cat. C
[MTV-IRMOF-74-III-(CH3)0.6(CH2NH-Asp-
His-Cys-NH2)0.1] in the specific sequence
containing serine.
(b) Cartoon representation of the enzyme TEV
endoprotease, highlighting the three amino
acids that participate in the catalysis.
Fracaroli A. M., Siman P., Nagib D. A., Suzuki M., Furukawa H., Toste F. D., and Yaghi O. M., J. Am. Chem. Soc., 2016, 138 (27), pp 8352–8355.
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• GPC
• DSC/TGA
• NMR
• IR
• Mechanical characterization of polymers using Rheometer and related instruments
• HPLC
• MS-LCQ Fleet Ion Trap (Thermo Scientific)
• Peptide synthesizers of CSBio and CEM
• Powder X-ray diffraction (PXRD) - Bruker
• Single crystal X-ray diffraction (SC-XRD) - Bruker
Acquired Technical Knowledge
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