1
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Drouin M, Wadhwani P, Grage SL, Bürck J, Reichert J, Tremblay S, Mayer MS, Diel C, Staub A, Paquin JF, Ulrich AS. Monofluoroalkene-Isostere as a 19 F NMR Label for the Peptide Backbone: Synthesis and Evaluation in Membrane-Bound PGLa and (KIGAKI) 3. Chemistry 2020; 26:1511-1517. [PMID: 31867761 DOI: 10.1002/chem.201905054] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 12/18/2019] [Indexed: 12/12/2022]
Abstract
Solid-state 19 F NMR is a powerful method to study the interactions of biologically active peptides with membranes. So far, in labelled peptides, the 19 F-reporter group has always been installed on the side chain of an amino acid. Given the fact that monofluoroalkenes are non-hydrolyzable peptide bond mimics, we have synthesized a monofluoroalkene-based dipeptide isostere, Val-Ψ[(Z)-CF=CH]-Gly, and inserted it in the sequence of two well-studied antimicrobial peptides: PGLa and (KIGAKI)3 are representatives of an α-helix and a β-sheet. The conformations and biological activities of these labeled peptides were studied to assess the suitability of monofluoroalkenes for 19 F NMR structure analysis.
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Affiliation(s)
- Myriam Drouin
- PROTEO, CCVC, Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, Québec, G1V 0A6, Canada
| | - Parvesh Wadhwani
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
| | - Stephan L Grage
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
| | - Jochen Bürck
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
| | - Johannes Reichert
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
| | - Sébastien Tremblay
- PROTEO, CCVC, Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, Québec, G1V 0A6, Canada
| | - Marie Sabine Mayer
- PROTEO, CCVC, Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, Québec, G1V 0A6, Canada.,Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
| | - Christian Diel
- PROTEO, CCVC, Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, Québec, G1V 0A6, Canada.,Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
| | - Alexander Staub
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
| | - Jean-François Paquin
- PROTEO, CCVC, Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, Québec, G1V 0A6, Canada
| | - Anne S Ulrich
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, P. O. Box 3640, 76021, Karlsruhe, Germany
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2
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Lou YG, Wang AJ, Zhao L, He LF, Li XF, He CY, Zhang X. Palladium-catalyzed cross-coupling of unactivated alkylzinc reagents with 2-bromo-3,3,3-trifluoropropene and its application in the synthesis of fluorinated amino acids. Chem Commun (Camb) 2019; 55:3705-3708. [DOI: 10.1039/c8cc10212k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A palladium-catalyzed cross-coupling of unactivated alkylzinc reagents with 2-bromo-3,3,3-trifluoropropene (BTP) has been developed, which was used as a key step to prepare a series of trifluoromethylated and difluoromethylated amino acids.
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Affiliation(s)
- Yue-Guang Lou
- Generic Drug Research Center of Guizhou Province
- School of Pharmacy
- Zunyi Medical University
- Zunyi
- P. R. China
| | - An-Jun Wang
- Generic Drug Research Center of Guizhou Province
- School of Pharmacy
- Zunyi Medical University
- Zunyi
- P. R. China
| | - Liang Zhao
- Generic Drug Research Center of Guizhou Province
- School of Pharmacy
- Zunyi Medical University
- Zunyi
- P. R. China
| | - Lin-Feng He
- Generic Drug Research Center of Guizhou Province
- School of Pharmacy
- Zunyi Medical University
- Zunyi
- P. R. China
| | - Xiao-Fei Li
- Generic Drug Research Center of Guizhou Province
- School of Pharmacy
- Zunyi Medical University
- Zunyi
- P. R. China
| | - Chun-Yang He
- Generic Drug Research Center of Guizhou Province
- School of Pharmacy
- Zunyi Medical University
- Zunyi
- P. R. China
| | - Xingang Zhang
- Key Laboratory of Organofluorine Chemistry
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
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3
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Kokhan SO, Tymtsunik AV, Grage SL, Afonin S, Babii O, Berditsch M, Strizhak AV, Bandak D, Platonov MO, Komarov IV, Ulrich AS, Mykhailiuk PK. Design, Synthesis, and Application of an Optimized Monofluorinated Aliphatic Label for Peptide Studies by Solid-State 19
F NMR Spectroscopy. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608116] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Serhii O. Kokhan
- Enamine Ltd; Chervonotkatska 78 02094 Kyiv Ukraine
- Institute of High Technologies; Taras Shevchenko National University of Kyiv; Volodymyrska 60 01601 Kyiv Ukraine
| | - Andriy V. Tymtsunik
- Enamine Ltd; Chervonotkatska 78 02094 Kyiv Ukraine
- Institute of High Technologies; Taras Shevchenko National University of Kyiv; Volodymyrska 60 01601 Kyiv Ukraine
| | - Stephan L. Grage
- Institute of Biological Interfaces (IBG-2); Karlsruhe Institute of Technology (KIT); POB 3640 76021 Karlsruhe Germany
| | - Sergii Afonin
- Institute of Biological Interfaces (IBG-2); Karlsruhe Institute of Technology (KIT); POB 3640 76021 Karlsruhe Germany
| | - Oleg Babii
- Institute of Organic Chemistry (IOC); KIT; Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Marina Berditsch
- Institute of Organic Chemistry (IOC); KIT; Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | | | | | | | - Igor V. Komarov
- Institute of High Technologies; Taras Shevchenko National University of Kyiv; Volodymyrska 60 01601 Kyiv Ukraine
| | - Anne S. Ulrich
- Institute of Biological Interfaces (IBG-2); Karlsruhe Institute of Technology (KIT); POB 3640 76021 Karlsruhe Germany
- Institute of Organic Chemistry (IOC); KIT; Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Pavel K. Mykhailiuk
- Enamine Ltd; Chervonotkatska 78 02094 Kyiv Ukraine
- Chemistry Department; Taras Shevchenko National University of Kyiv; Volodymyrska 64 01601 Kyiv Ukraine
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4
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Kokhan SO, Tymtsunik AV, Grage SL, Afonin S, Babii O, Berditsch M, Strizhak AV, Bandak D, Platonov MO, Komarov IV, Ulrich AS, Mykhailiuk PK. Design, Synthesis, and Application of an Optimized Monofluorinated Aliphatic Label for Peptide Studies by Solid‐State
19
F NMR Spectroscopy. Angew Chem Int Ed Engl 2016; 55:14788-14792. [DOI: 10.1002/anie.201608116] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Serhii O. Kokhan
- Enamine Ltd Chervonotkatska 78 02094 Kyiv Ukraine
- Institute of High Technologies Taras Shevchenko National University of Kyiv Volodymyrska 60 01601 Kyiv Ukraine
| | - Andriy V. Tymtsunik
- Enamine Ltd Chervonotkatska 78 02094 Kyiv Ukraine
- Institute of High Technologies Taras Shevchenko National University of Kyiv Volodymyrska 60 01601 Kyiv Ukraine
| | - Stephan L. Grage
- Institute of Biological Interfaces (IBG-2) Karlsruhe Institute of Technology (KIT) POB 3640 76021 Karlsruhe Germany
| | - Sergii Afonin
- Institute of Biological Interfaces (IBG-2) Karlsruhe Institute of Technology (KIT) POB 3640 76021 Karlsruhe Germany
| | - Oleg Babii
- Institute of Organic Chemistry (IOC) KIT Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Marina Berditsch
- Institute of Organic Chemistry (IOC) KIT Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | | | | | | | - Igor V. Komarov
- Institute of High Technologies Taras Shevchenko National University of Kyiv Volodymyrska 60 01601 Kyiv Ukraine
| | - Anne S. Ulrich
- Institute of Biological Interfaces (IBG-2) Karlsruhe Institute of Technology (KIT) POB 3640 76021 Karlsruhe Germany
- Institute of Organic Chemistry (IOC) KIT Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Pavel K. Mykhailiuk
- Enamine Ltd Chervonotkatska 78 02094 Kyiv Ukraine
- Chemistry Department Taras Shevchenko National University of Kyiv Volodymyrska 64 01601 Kyiv Ukraine
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5
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Huhmann S, Nyakatura EK, Erdbrink H, Gerling UI, Czekelius C, Koksch B. Effects of single substitutions with hexafluoroleucine and trifluorovaline on the hydrophobic core formation of a heterodimeric coiled coil. J Fluor Chem 2015. [DOI: 10.1016/j.jfluchem.2015.03.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Manzo G, Scorciapino MA, Wadhwani P, Bürck J, Montaldo NP, Pintus M, Sanna R, Casu M, Giuliani A, Pirri G, Luca V, Ulrich AS, Rinaldi AC. Enhanced amphiphilic profile of a short β-stranded peptide improves its antimicrobial activity. PLoS One 2015; 10:e0116379. [PMID: 25617899 PMCID: PMC4305290 DOI: 10.1371/journal.pone.0116379] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 12/05/2014] [Indexed: 12/11/2022] Open
Abstract
SB056 is a novel semi-synthetic antimicrobial peptide with a dimeric dendrimer scaffold. Active against both Gram-negative and -positive bacteria, its mechanism has been attributed to a disruption of bacterial membranes. The branched peptide was shown to assume a β-stranded conformation in a lipidic environment. Here, we report on a rational modification of the original, empirically derived linear peptide sequence [WKKIRVRLSA-NH2, SB056-lin]. We interchanged the first two residues [KWKIRVRLSA-NH2, β-SB056-lin] to enhance the amphipathic profile, in the hope that a more regular β-strand would lead to a better antimicrobial performance. MIC values confirmed that an enhanced amphiphilic profile indeed significantly increases activity against both Gram-positive and -negative strains. The membrane binding affinity of both peptides, measured by tryptophan fluorescence, increased with an increasing ratio of negatively charged/zwitterionic lipids. Remarkably, β-SB056-lin showed considerable binding even to purely zwitterionic membranes, unlike the original sequence, indicating that besides electrostatic attraction also the amphipathicity of the peptide structure plays a fundamental role in binding, by stabilizing the bound state. Synchrotron radiation circular dichroism and solid-state 19F-NMR were used to characterize and compare the conformation and mobility of the membrane bound peptides. Both SB056-lin and β-SB056-lin adopt a β-stranded conformation upon binding POPC vesicles, but the former maintains an intrinsic structural disorder that also affects its aggregation tendency. Upon introducing some anionic POPG into the POPC matrix, the sequence-optimized β-SB056-lin forms well-ordered β-strands once electro-neutrality is approached, and it aggregates into more extended β-sheets as the concentration of anionic lipids in the bilayer is raised. The enhanced antimicrobial activity of the analogue correlates with the formation of these extended β-sheets, which also leads to a dramatic alteration of membrane integrity as shown by 31P-NMR. These findings are generally relevant for the design and optimization of other membrane-active antimicrobial peptides that can fold into amphipathic β-strands.
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Affiliation(s)
- Giorgia Manzo
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato (CA), Italy
| | - Mariano A. Scorciapino
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato (CA), Italy
| | - Parvesh Wadhwani
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), POB 3640, 76021 Karlsruhe, Germany
| | - Jochen Bürck
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), POB 3640, 76021 Karlsruhe, Germany
| | - Nicola Pietro Montaldo
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato (CA), Italy
| | - Manuela Pintus
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato (CA), Italy
| | - Roberta Sanna
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato (CA), Italy
| | - Mariano Casu
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato (CA), Italy
| | - Andrea Giuliani
- Research & Development Unit, Spider Biotech S.r.l., I-10010 Colleretto Giacosa (TO), Italy
| | - Giovanna Pirri
- Research & Development Unit, Spider Biotech S.r.l., I-10010 Colleretto Giacosa (TO), Italy
| | - Vincenzo Luca
- Dipartimento di Scienze Biochimiche, “A. Rossi Fanelli”, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, Italy
| | - Anne S. Ulrich
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), POB 3640, 76021 Karlsruhe, Germany
- Institute of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Andrea C. Rinaldi
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, I-09042 Monserrato (CA), Italy
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7
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Bandak D, Babii O, Vasiuta R, Komarov IV, Mykhailiuk PK. Design and synthesis of novel 19F-amino acid: a promising 19F NMR label for peptide studies. Org Lett 2014; 17:226-9. [PMID: 25545327 DOI: 10.1021/ol503300m] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Novel aliphatic (19)F-substituted amino acid was designed as a (19)F NMR label for peptide studies. The synthesis was performed in 11 steps and 9% overall yield from a commercially available starting material. The key transformation was a decarboxylative fluorination of an aliphatic carboxylic acid with XeF2 in C6F6.
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Affiliation(s)
- Dmytro Bandak
- Department of Chemistry, Taras Shevchenko National University of Kyiv , Volodymyrska 64, Kyiv 01601, Ukraine
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8
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Fanghänel S, Wadhwani P, Strandberg E, Verdurmen WPR, Bürck J, Ehni S, Mykhailiuk PK, Afonin S, Gerthsen D, Komarov IV, Brock R, Ulrich AS. Structure analysis and conformational transitions of the cell penetrating peptide transportan 10 in the membrane-bound state. PLoS One 2014; 9:e99653. [PMID: 24937132 PMCID: PMC4061077 DOI: 10.1371/journal.pone.0099653] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 05/18/2014] [Indexed: 11/18/2022] Open
Abstract
Structure analysis of the cell-penetrating peptide transportan 10 (TP10) revealed an exemplary range of different conformations in the membrane-bound state. The bipartite peptide (derived N-terminally from galanin and C-terminally from mastoparan) was found to exhibit prominent characteristics of (i) amphiphilic α-helices, (ii) intrinsically disordered peptides, as well as (iii) β-pleated amyloid fibrils, and these conformational states become interconverted as a function of concentration. We used a complementary approach of solid-state (19)F-NMR and circular dichroism in oriented membrane samples to characterize the structural and dynamical behaviour of TP10 in its monomeric and aggregated forms. Nine different positions in the peptide were selectively substituted with either the L- or D-enantiomer of 3-(trifluoromethyl)-bicyclopent-[1.1.1]-1-ylglycine (CF3-Bpg) as a reporter group for (19)F-NMR. Using the L-epimeric analogs, a comprehensive three-dimensional structure analysis was carried out in lipid bilayers at low peptide concentration, where TP10 is monomeric. While the N-terminal region is flexible and intrinsically unstructured within the plane of the lipid bilayer, the C-terminal α-helix is embedded in the membrane with an oblique tilt angle of ∼ 55° and in accordance with its amphiphilic profile. Incorporation of the sterically obstructive D-CF3-Bpg reporter group into the helical region leads to a local unfolding of the membrane-bound peptide. At high concentration, these helix-destabilizing C-terminal substitutions promote aggregation into immobile β-sheets, which resemble amyloid fibrils. On the other hand, the obstructive D-CF3-Bpg substitutions can be accommodated in the flexible N-terminus of TP10 where they do not promote aggregation at high concentration. The cross-talk between the two regions of TP10 thus exerts a delicate balance on its conformational switch, as the presence of the α-helix counteracts the tendency of the unfolded N-terminus to self-assemble into β-pleated fibrils.
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Affiliation(s)
- Susanne Fanghänel
- Karlsruhe Institute of Technology (KIT), Institute of Organic Chemistry and DFG-Center for Functional Nanostructures (CFN), Karlsruhe, Germany
| | - Parvesh Wadhwani
- KIT, Institute of Biological Interfaces (IBG2), Karlsruhe, Germany
| | - Erik Strandberg
- KIT, Institute of Biological Interfaces (IBG2), Karlsruhe, Germany
| | - Wouter P. R. Verdurmen
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Jochen Bürck
- KIT, Institute of Biological Interfaces (IBG2), Karlsruhe, Germany
| | - Sebastian Ehni
- Karlsruhe Institute of Technology (KIT), Institute of Organic Chemistry and DFG-Center for Functional Nanostructures (CFN), Karlsruhe, Germany
| | - Pavel K. Mykhailiuk
- Taras Shevchenko National University of Kyiv, Chemistry Department, Kyiv, Ukraine and Enamine Ltd., Kyiv, Ukraine
| | - Sergii Afonin
- KIT, Institute of Biological Interfaces (IBG2), Karlsruhe, Germany
| | | | - Igor V. Komarov
- Taras Shevchenko National University of Kyiv, Institute of High Technologies, Kyiv, Ukraine
| | - Roland Brock
- Department of Biochemistry, Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Anne S. Ulrich
- Karlsruhe Institute of Technology (KIT), Institute of Organic Chemistry and DFG-Center for Functional Nanostructures (CFN), Karlsruhe, Germany
- KIT, Institute of Biological Interfaces (IBG2), Karlsruhe, Germany
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9
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Wadhwani P, Strandberg E, van den Berg J, Mink C, Bürck J, Ciriello RA, Ulrich AS. Dynamical structure of the short multifunctional peptide BP100 in membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:940-9. [DOI: 10.1016/j.bbamem.2013.11.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 10/25/2013] [Accepted: 11/01/2013] [Indexed: 11/26/2022]
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10
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Tkachenko AN, Mykhailiuk PK, Afonin S, Radchenko DS, Kubyshkin VS, Ulrich AS, Komarov IV. A19F NMR Label to Substitute Polar Amino Acids in Peptides: A CF3-Substituted Analogue of Serine and Threonine. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201208069] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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11
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Tkachenko AN, Mykhailiuk PK, Afonin S, Radchenko DS, Kubyshkin VS, Ulrich AS, Komarov IV. A 19F NMR label to substitute polar amino acids in peptides: a CF3-substituted analogue of serine and threonine. Angew Chem Int Ed Engl 2012; 52:1486-9. [PMID: 23345130 DOI: 10.1002/anie.201208069] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Anton N Tkachenko
- Organic Chemistry Department, Taras Shevchenko National University of Kyiv, Volodymyrska 64, 01601 Kyiv, Ukraine
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12
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Suzuki Y, Brender JR, Hartman K, Ramamoorthy A, G. Marsh EN. Alternative pathways of human islet amyloid polypeptide aggregation distinguished by (19)f nuclear magnetic resonance-detected kinetics of monomer consumption. Biochemistry 2012; 51:8154-62. [PMID: 22998665 PMCID: PMC3543753 DOI: 10.1021/bi3012548] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Amyloid formation, a complex process involving many intermediate states, is proposed to be the driving force for amyloid-related toxicity in common degenerative diseases. Unfortunately, the details of this process have been obscured by the limitations in the methods that can follow this reaction in real time. We show that alternative pathways of aggregation can be distinguished by using (19)F nuclear magnetic resonance (NMR) to monitor monomer consumption along with complementary measurements of fibrillogenesis. The utility of this technique is demonstrated by tracking amyloid formation in the diabetes-related islet amyloid polypeptide (IAPP). Using this technique, we show IAPP fibrillizes without an appreciable buildup of nonfibrillar intermediates, in contrast to the well-studied Aβ and α-synuclein proteins. To further develop the usage of (19)F NMR, we have tracked the influence of the polyphenolic amyloid inhibitor epigallocatechin gallate (EGCG) on the aggregation pathway. Polyphenols have been shown to strongly inhibit amyloid formation in many systems. However, spectroscopic measurements of amyloid inhibition by these compounds can be severely compromised by background signals and competitive binding with extrinsic probes. Using (19)F NMR, we show that thioflavin T strongly competes with EGCG for binding sites on IAPP fibers. By comparing the rates of monomer consumption and fiber formation, we are able to show that EGCG stabilizes nonfibrillar large aggregates during fibrillogenesis.
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Affiliation(s)
- Yuta Suzuki
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
| | | | - Kevin Hartman
- Department of Biophysics University of Michigan, Ann Arbor, MI 48109
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
- Department of Biophysics University of Michigan, Ann Arbor, MI 48109
| | - E. Neil G. Marsh
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
- Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109
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13
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Gerus II, Mironetz RX, Kondratov IS, Bezdudny AV, Dmytriv YV, Shishkin OV, Starova VS, Zaporozhets OA, Tolmachev AA, Mykhailiuk PK. “Reported, but Still Unknown.” A Closer Look into 3,4-Bis- and 3,4,5-Tris(trifluoromethyl)pyrazoles. J Org Chem 2011; 77:47-56. [DOI: 10.1021/jo202305c] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Igor I. Gerus
- Enamine Ltd., Oleksandra
Matrosova
Street, 23, Kyiv 01103, Ukraine
- Institute of Bioorganic Chemistry
and Petrochemistry, National Ukrainian Academy of Science, Murmanska 1, Kiev 02660, Ukraine
| | - Roman X. Mironetz
- Institute of Bioorganic Chemistry
and Petrochemistry, National Ukrainian Academy of Science, Murmanska 1, Kiev 02660, Ukraine
| | - Ivan S. Kondratov
- Enamine Ltd., Oleksandra
Matrosova
Street, 23, Kyiv 01103, Ukraine
- Institute of Bioorganic Chemistry
and Petrochemistry, National Ukrainian Academy of Science, Murmanska 1, Kiev 02660, Ukraine
| | - Andrei V. Bezdudny
- Enamine Ltd., Oleksandra
Matrosova
Street, 23, Kyiv 01103, Ukraine
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska
Street 5, 02660, Kyiv 94, Ukraine
| | - Yurii V. Dmytriv
- Enamine Ltd., Oleksandra
Matrosova
Street, 23, Kyiv 01103, Ukraine
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska
Street 5, 02660, Kyiv 94, Ukraine
| | - Oleg V. Shishkin
- STC, Institute for Single Crystalls, National Academy of Science of Ukraine, 60 Lenina Avenue, Kharkiv 61001,
Ukraine
| | - Viktoriia S. Starova
- Department of Chemistry, Kyiv National Taras Shevchenko University, Volodymyrska
Street, 64, Kyiv 01033, Ukraine
| | - Olga A. Zaporozhets
- Department of Chemistry, Kyiv National Taras Shevchenko University, Volodymyrska
Street, 64, Kyiv 01033, Ukraine
| | - Andrey A. Tolmachev
- Enamine Ltd., Oleksandra
Matrosova
Street, 23, Kyiv 01103, Ukraine
- Department of Chemistry, Kyiv National Taras Shevchenko University, Volodymyrska
Street, 64, Kyiv 01033, Ukraine
| | - Pavel K. Mykhailiuk
- Enamine Ltd., Oleksandra
Matrosova
Street, 23, Kyiv 01103, Ukraine
- Department of Chemistry, Kyiv National Taras Shevchenko University, Volodymyrska
Street, 64, Kyiv 01033, Ukraine
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