51
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Fathi V, Ramezanpour S, Balalaie S, Rominger F, Reza Bijanzadeh H. An Efficient Approach to the Synthesis of HydrazinylPseudo-Peptides. Helv Chim Acta 2014. [DOI: 10.1002/hlca.201400061] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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52
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Blocker M, Immaneni S, Shaikh A. Triflic acid-catalyzed Csp3–H functionalization of 2-methyl azaarenes with a α-trifluoromethyl imino ester. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.061] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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53
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Falkowska E, Suzenet F, Jubault P, Bouillon JP, Pannecoucke X. A mild and efficient synthesis of new pentafluorosulfanyl-substituted electron-deficient alkenes and allylsilanes. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.06.117] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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54
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Asano A, Yamada T, Doi M. Modulating the structure of phenylalanine-incorporated ascidiacyclamide through fluorination. J Pept Sci 2014; 20:794-802. [DOI: 10.1002/psc.2668] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 05/14/2014] [Accepted: 06/03/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Akiko Asano
- Osaka University of Pharmaceutical Sciences; 4-20-1, Nasahara Takatsuki Osaka 569-1094 Japan
| | - Takeshi Yamada
- Osaka University of Pharmaceutical Sciences; 4-20-1, Nasahara Takatsuki Osaka 569-1094 Japan
| | - Mitsunobu Doi
- Osaka University of Pharmaceutical Sciences; 4-20-1, Nasahara Takatsuki Osaka 569-1094 Japan
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55
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Sokolova NV, Nenajdenko VG. Azidoisocyanides, New Bifunctional Reagents for Multicomponent Reactions and Biomolecule Modifications. Chem Nat Compd 2014. [DOI: 10.1007/s10600-014-0914-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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56
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Harnisch FX, Galeta J, Harakat D, Potáček M, Bouillon JP. Combined intra-intermolecular criss-cross cycloaddition reactions leading to perfluoroalkylated fused tricyclic nitrogen heterocycles. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2013.12.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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57
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Zhang ZH, Zhang QQ, Feng S, Hu ZJ, Chen SC, Chen Q, He MY. Fluorinated metal–organic frameworks of 1,4-bis(1,2,4-triazol-1-ylmethyl)-2,3,5,6-tetrafluorobenzene: synergistic interactions of ligand isomerism and counteranions. Dalton Trans 2014; 43:646-55. [DOI: 10.1039/c3dt52211c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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58
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Abstract
Highly fluorinated analogs of hydrophobic amino acids have proven to be generally effective in increasing the thermodynamic stability of proteins. These non-proteogenic amino acids can be incorporated into both α-helix and β-sheet structural motifs and generally enhance protein stability towards unfolding by heat and chemical denaturants, and retard their degradation by proteases. Recent detailed structural and thermodynamic studies have demonstrated that the increase in buried hydrophobic surface area that accompanies fluorination is primarily responsible for the stabilizing properties of fluorinated side chains. Fluorination appears to be a particularly useful strategy for increasing protein stability because fluorinated amino acids closely retain the shape of the side chain, and are thus minimally perturbing to protein structure and function. The first part of this chapter discusses some examples of highly fluorinated model proteins designed by our laboratory and protocols for their synthesis. In the second part, methods for determining their thermodynamic stability, along with conditions that have proven to be useful for crystallizing these proteins, are presented.
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Affiliation(s)
- Benjamin C Buer
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI, 48109, USA
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59
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Biava H, Budisa N. Obtention of enantiomerically pure 5,5,5-trifluoro-l-isoleucine and 5,5,5-trifluoro-l-alloisoleucine. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.07.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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60
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Aceña JL, Sorochinsky AE, Moriwaki H, Sato T, Soloshonok VA. Synthesis of fluorine-containing α-amino acids in enantiomerically pure form via homologation of Ni(II) complexes of glycine and alanine Schiff bases. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.06.004] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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61
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Chaume G, Simon J, Caupène C, Lensen N, Miclet E, Brigaud T. Incorporation of CF3–Pseudoprolines into Peptides: A Methodological Study. J Org Chem 2013; 78:10144-53. [DOI: 10.1021/jo401494q] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Grégory Chaume
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 Mail Gay-Lussac, 95000 Cergy-Pontoise, France
| | - Julien Simon
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 Mail Gay-Lussac, 95000 Cergy-Pontoise, France
| | - Caroline Caupène
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 Mail Gay-Lussac, 95000 Cergy-Pontoise, France
| | - Nathalie Lensen
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 Mail Gay-Lussac, 95000 Cergy-Pontoise, France
| | - Emeric Miclet
- Laboratoire des
BioMolécules, UMR 7203, Ecole Normale Supérieure, UPMC Paris 06, 4 Place Jussieu, 75005 Paris, France
| | - Thierry Brigaud
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 Mail Gay-Lussac, 95000 Cergy-Pontoise, France
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62
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Biava H, Budisa N. Biocatalytic synthesis of (2S)-5,5,5-trifluoroleucine and improved resolution into (2S,4S) and (2S,4R) diastereoisomers. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.04.128] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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63
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Kiss L, Nonn M, Sillanpää R, Fustero S, Fülöp F. Efficient regio- and stereoselective access to novel fluorinated β-aminocyclohexanecarboxylates. Beilstein J Org Chem 2013; 9:1164-9. [PMID: 23843909 PMCID: PMC3701410 DOI: 10.3762/bjoc.9.130] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 05/21/2013] [Indexed: 11/26/2022] Open
Abstract
A regio- and stereoselective method has been developed for the synthesis of novel fluorinated 2-aminocyclohexanecarboxylic acid derivatives with the fluorine attached to position 4 of the ring. The synthesis starts from either cis- or trans-β-aminocyclohex-4-enecarboxylic acids and involves regio- and stereoselective transformation of the ring C–C double bond through iodooxazine formation and hydroxylation, followed by hydroxy–fluorine or oxo–fluorine exchange.
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Affiliation(s)
- Loránd Kiss
- University of Szeged, Institute of Pharmaceutical Chemistry, Szeged, Hungary
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64
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Fioravanti S, Pellacani L, Vergari MC. Fluorinated β-nitro amines by a selective ZrCl4-catalyzed aza-Henry reaction of (E)-trifluoromethyl aldimines. Org Biomol Chem 2013; 10:8207-10. [PMID: 23007677 DOI: 10.1039/c2ob26397a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ZrCl(4) was found to be an ideal catalyst to promote aza-Henry reactions between trifluoromethyl aldimines and some nitro alkanes giving new fluorinated β-nitro amines. The reaction is strongly influenced by the CF(3) group, the yield by the alkyl chain of the nitro compound, while the stereochemical outcome seems to be unaffected, the anti isomer being always the major product.
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Affiliation(s)
- Stefania Fioravanti
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", Italy.
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65
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Jlalia I, Lensen N, Chaume G, Dzhambazova E, Astasidi L, Hadjiolova R, Bocheva A, Brigaud T. Synthesis of an MIF-1 analogue containing enantiopure (S)-α-trifluoromethyl-proline and biological evaluation on nociception. Eur J Med Chem 2013; 62:122-9. [PMID: 23353749 DOI: 10.1016/j.ejmech.2012.12.041] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 12/19/2012] [Accepted: 12/23/2012] [Indexed: 11/16/2022]
Abstract
The synthesis and the effect of a novel MIF-1 analogue on nociception during acute pain in rat model are reported. The synthesis of this enantiopure trifluoromethyl group containing tripeptide was performed through a peptide coupling reaction between the HCl. Leu-Gly-NH2 and the (S)-α-Tfm-proline. The analgesic effect of the CF3-(MIF-1) 2 has been evaluated in vivo on rat model by paw pressure (PP) and hot plate (HP) tests and compared to the native peptide MIF-1. Highest analgesic effect was observed with CF3-(MIF-1) 2 only in PP test. In order to study the mechanisms of nociception induced by the studied peptides, the involvement of the opioid and the nitric oxideergic systems was investigated. The results are in favor of a participation of both system since pretreatment, 20 min before injection of the CF3-(MIF-1) 2, with the non-competitive antagonist of opiate receptors naloxone, the nitric oxide synthase (NOS) inhibitor l-N(G)-nitroarginine ester (l-NAME) or the nitric oxide (NO) donor l-arginine (l-Arg) significantly decreased the pain perception in PP and HP tests.
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Affiliation(s)
- Ibtissem Jlalia
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 Mail Gay Lussac, Neuville sur Oise, 95000 Cergy-Pontoise Cedex, France
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66
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Chen SC, Zhang ZH, Chen Q, Wang LQ, Xu J, He MY, Du M, Yang XP, Jones RA. An efficient strategy to achieve hydrophilic polymeric silver(i) materials with exceptional antibacterial activity. Chem Commun (Camb) 2013; 49:1270-2. [DOI: 10.1039/c2cc36538c] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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67
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Milanole G, Couve-Bonnaire S, Bonfanti JF, Jubault P, Pannecoucke X. Synthesis of Fluorinated Cyclopropyl Amino Acid Analogues: Toward the Synthesis of Original Fluorinated Peptidomimetics. J Org Chem 2012; 78:212-23. [DOI: 10.1021/jo302222n] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Gaëlle Milanole
- INSA de Rouen, UMR 6014 & FR 3038, COBRA Université de Rouen, 1 rue Tesnière, 76131 Mont-Saint-Aignan Cedex, France
| | - Samuel Couve-Bonnaire
- INSA de Rouen, UMR 6014 & FR 3038, COBRA Université de Rouen, 1 rue Tesnière, 76131 Mont-Saint-Aignan Cedex, France
| | - Jean-François Bonfanti
- Janssen Research & Development, Medicinal Chemistry Infectious Diseases, Centre de Recherche Janssen Cilag, Campus de Maigremont, BP 615, 27106 Val de Reuil Cedex, France
| | - Philippe Jubault
- INSA de Rouen, UMR 6014 & FR 3038, COBRA Université de Rouen, 1 rue Tesnière, 76131 Mont-Saint-Aignan Cedex, France
| | - Xavier Pannecoucke
- INSA de Rouen, UMR 6014 & FR 3038, COBRA Université de Rouen, 1 rue Tesnière, 76131 Mont-Saint-Aignan Cedex, France
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68
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69
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Buer BC, Levin BJ, Marsh ENG. Influence of Fluorination on the Thermodynamics of Protein Folding. J Am Chem Soc 2012; 134:13027-34. [DOI: 10.1021/ja303521h] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Benjamin C. Buer
- Departments of †Chemistry and ‡Biological Chemistry, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Benjamin J. Levin
- Departments of †Chemistry and ‡Biological Chemistry, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - E. Neil G. Marsh
- Departments of †Chemistry and ‡Biological Chemistry, University of Michigan, Ann Arbor, Michigan
48109, United States
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70
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Weberski MP, Chen C, Delferro M, Zuccaccia C, Macchioni A, Marks TJ. Suppression of β-Hydride Chain Transfer in Nickel(II)-Catalyzed Ethylene Polymerization via Weak Fluorocarbon Ligand–Product Interactions. Organometallics 2012. [DOI: 10.1021/om3002735] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Michael P. Weberski
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
| | - Changle Chen
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
| | - Massimiliano Delferro
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
| | - Cristiano Zuccaccia
- Dipartimento di Chimica, Università degli Studi di Perugia, Via Elce di Sotto, 8-06123 Perugia,
Italy
| | - Alceo Macchioni
- Dipartimento di Chimica, Università degli Studi di Perugia, Via Elce di Sotto, 8-06123 Perugia,
Italy
| | - Tobin J. Marks
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113,
United States
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71
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Buer BC, Marsh ENG. Fluorine: a new element in protein design. Protein Sci 2012; 21:453-62. [PMID: 22274989 PMCID: PMC3375745 DOI: 10.1002/pro.2030] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 01/09/2012] [Indexed: 11/08/2022]
Abstract
Fluorocarbons are quintessentially man-made molecules, fluorine being all but absent from biology. Perfluorinated molecules exhibit novel physicochemical properties that include extreme chemical inertness, thermal stability, and an unusual propensity for phase segregation. The question we and others have sought to answer is to what extent can these properties be engineered into proteins? Here, we review recent studies in which proteins have been designed that incorporate highly fluorinated analogs of hydrophobic amino acids with the aim of creating proteins with novel chemical and biological properties. Fluorination seems to be a general and effective strategy to enhance the stability of proteins, both soluble and membrane bound, against chemical and thermal denaturation, although retaining structure and biological activity. Most studies have focused on small proteins that can be produced by peptide synthesis as synthesis of large proteins containing specifically fluorinated residues remains challenging. However, the development of various biosynthetic methods for introducing noncanonical amino acids into proteins promises to expand the utility of fluorinated amino acids in protein design.
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Affiliation(s)
- Benjamin C Buer
- Department of Chemistry, University of MichiganAnn Arbor, Michigan 48109
| | - E Neil G Marsh
- Department of Chemistry, University of MichiganAnn Arbor, Michigan 48109
- Department of Biological Chemistry, University of Michigan Medical SchoolAnn Arbor, Michigan 48109
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72
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Feytens D, Chaume G, Chassaing G, Lavielle S, Brigaud T, Byun BJ, Kang YK, Miclet E. Local Control of the Cis–Trans Isomerization and Backbone Dihedral Angles in Peptides Using Trifluoromethylated Pseudoprolines. J Phys Chem B 2012; 116:4069-79. [DOI: 10.1021/jp300284u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Debby Feytens
- Laboratoire des BioMolécules, UPMC Paris 06, 4, Place Jussieu, 75005 Paris, France
- Laboratoire des BioMolécules, Departement de Chimie, Ecole Normale Superieure, 24, rue Lhomond, 75005 Paris, France
- UMR 7203, FR 2569, 4, Place Jussieu, 75005 Paris, France
| | - Grégory Chaume
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 mail Gay Lussac, 95000 Cergy-Pontoise, France
| | - Gérard Chassaing
- Laboratoire des BioMolécules, UPMC Paris 06, 4, Place Jussieu, 75005 Paris, France
- Laboratoire des BioMolécules, Departement de Chimie, Ecole Normale Superieure, 24, rue Lhomond, 75005 Paris, France
- UMR 7203, FR 2569, 4, Place Jussieu, 75005 Paris, France
| | - Solange Lavielle
- Laboratoire des BioMolécules, UPMC Paris 06, 4, Place Jussieu, 75005 Paris, France
- Laboratoire des BioMolécules, Departement de Chimie, Ecole Normale Superieure, 24, rue Lhomond, 75005 Paris, France
- UMR 7203, FR 2569, 4, Place Jussieu, 75005 Paris, France
| | - Thierry Brigaud
- Laboratoire SOSCO, Université de Cergy-Pontoise, EA 4505, 5 mail Gay Lussac, 95000 Cergy-Pontoise, France
| | - Byung Jin Byun
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea
| | - Young Kee Kang
- Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea
| | - Emeric Miclet
- Laboratoire des BioMolécules, UPMC Paris 06, 4, Place Jussieu, 75005 Paris, France
- Laboratoire des BioMolécules, Departement de Chimie, Ecole Normale Superieure, 24, rue Lhomond, 75005 Paris, France
- UMR 7203, FR 2569, 4, Place Jussieu, 75005 Paris, France
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73
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Humelnicu I, Würthwein EU, Haufe G. The conformers of 3-fluoroalanine. A theoretical study. Org Biomol Chem 2012; 10:2084-93. [PMID: 22286189 DOI: 10.1039/c2ob06492h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quantum chemical calculations (DFT, SCS-MP2) show that the relative energies of the four principal alanine conformations are only marginally altered by the introduction of a single fluorine substituent into the methyl group. The fluorine gauche effect and attractive interactions of fluorine to the O-H or N-H moieties (formation of hydrogen bridges) do stabilize particular conformers of 3-fluoroalanine. This is true for the neutral molecule both in the gas phase and in aqueous solution (CPCM-model), but also for the zwitterionic forms and the conformers of the related carboxylate ions and also for the respective ammonium ions in aqueous solution. In water (CPCM calculations), the zwitterion is almost equal in energy to the most stable conformer of the neutral 3-fluoroalanine. Compared to alanine the atomic charges of the amino group and the carboxyl function of 3-fluoroalanine are not significantly influenced by the fluorine at C3, which relates to the fact that both experimental pK(a) values are almost equal for alanine and 3-fluoroalanine.
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Affiliation(s)
- Ionel Humelnicu
- Organisch Chemisches Institut, Universität Münster, Corrensstr. 40, D-48149 Münster, Germany.
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74
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Mortenson DE, Satyshur KA, Guzei IA, Forest KT, Gellman SH. Quasiracemic crystallization as a tool to assess the accommodation of noncanonical residues in nativelike protein conformations. J Am Chem Soc 2012; 134:2473-6. [PMID: 22280019 PMCID: PMC3351109 DOI: 10.1021/ja210045s] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Quasiracemic crystallization has been used to obtain high-resolution structures of two variants of the villin headpiece subdomain (VHP) that contain a pentafluorophenylalanine (F(5)Phe) residue in the hydrophobic core. In each case, the crystal contained the variant constructed from l-amino acids and the native sequence constructed from d-amino acids. We were motivated to undertake these studies by reports that racemic proteins crystallize more readily than homochiral forms and the prospect that quasiracemic crystallization would enable us to determine whether a polypeptide containing a noncanonical residue can closely mimic the tertiary structure of the native sequence. The results suggest that quasiracemic crystallization may prove to be generally useful for assessing mimicry of naturally evolved protein folding patterns by polypeptides that contain unnatural side-chain or backbone subunits.
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Affiliation(s)
- David E. Mortenson
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave. Madison, WI 53706 (USA)
| | - Kenneth A. Satyshur
- Department of Bacteriology, University of Wisconsin-Madison, 1550 Linden Drive, Madison, WI 53706 (USA)
| | - Ilia A. Guzei
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave. Madison, WI 53706 (USA)
| | - Katrina T. Forest
- Department of Bacteriology, University of Wisconsin-Madison, 1550 Linden Drive, Madison, WI 53706 (USA)
| | - Samuel H. Gellman
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave. Madison, WI 53706 (USA)
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75
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Wu J, Zhao W, Cao S. Synthesis of Difluoromethyl-Containing α-Acyloxycarboxamide Derivatives through a Passerini Reaction and Desulfonylation. European J Org Chem 2012. [DOI: 10.1002/ejoc.201101518] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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76
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Hunter L, Butler S, Ludbrook SB. Solid phase synthesis of peptides containing backbone-fluorinated amino acids. Org Biomol Chem 2012; 10:8911-8. [DOI: 10.1039/c2ob26596f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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77
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Merkel L, Budisa N. Organic fluorine as a polypeptide building element: in vivo expression of fluorinated peptides, proteins and proteomes. Org Biomol Chem 2012; 10:7241-61. [DOI: 10.1039/c2ob06922a] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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78
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Regioselective synthesis of 5-trifluoromethyl-1,2,3-triazoles via CF3-directed cyclization of 1-trifluoromethyl-1,3-dicarbonyl compounds with azides. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.10.110] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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79
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Katagiri T, Katayama Y, Taeda M, Ohshima T, Iguchi N, Uneyama K. Preparation of Optically Pure α-Trifluoromethyl-α-amino Acids from N-Tosyl-2-trifluoromethyl-2-alkyloxycarbonyl Aziridine. J Org Chem 2011; 76:9305-11. [DOI: 10.1021/jo201554g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Toshimasa Katagiri
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Yousuke Katayama
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Mayuko Taeda
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Takanori Ohshima
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Naomi Iguchi
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Kenji Uneyama
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
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80
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Wu J, Li H, Cao S. Novel synthesis of pseudopeptides bearing a difluoromethyl group by Ugi reaction and desulfanylation. Beilstein J Org Chem 2011; 7:1070-4. [PMID: 21915210 PMCID: PMC3170163 DOI: 10.3762/bjoc.7.123] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Accepted: 07/12/2011] [Indexed: 11/23/2022] Open
Abstract
Thirteen difluoromethyl-containing pseudopeptides were synthesized by Ugi reaction using the novel building block 2,2-difluoro-2-(phenylthio)acetic acid (2) as one component, followed by removal of the phenylsulfanyl protecting group in the presence of tributyltin hydride and azobisisobutyronitrile.
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Affiliation(s)
- Jingjing Wu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China
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81
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Kiss L, Forró E, Fustero S, Fülöp F. Regio- and diastereoselective fluorination of alicyclic β-amino acids. Org Biomol Chem 2011; 9:6528-34. [PMID: 21773624 DOI: 10.1039/c1ob05648d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A regio- and stereoselective approach to fluorinated β-aminocyclohexene or cyclohexane esters has been developed, starting from a bicyclic β-lactam (1). The procedure involves six or seven steps, based on regio- and stereoselective iodolactonization, lactone opening and hydroxy-fluorine exchange. The method has been extended to the synthesis of fluorinated amino ester enantiomers.
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Affiliation(s)
- Loránd Kiss
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720, Szeged, Eötvös u. 6, Szeged, Hungary
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82
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Kiss L, Forró E, Fustero S, Fülöp F. Selective Synthesis of New Fluorinated Alicyclic β-Amino Ester Stereoisomers. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100583] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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83
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Cametti M, Crousse B, Metrangolo P, Milani R, Resnati G. The fluorous effect in biomolecular applications. Chem Soc Rev 2011; 41:31-42. [PMID: 21691620 DOI: 10.1039/c1cs15084g] [Citation(s) in RCA: 319] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
From being a niche area only a few decades ago, fluorous chemistry has gained momentum and is, nowadays, a fervent area of research. It has brought forth, in fact, numerous applicative innovations that stretch among different fields: from catalysis to separation science, from supramolecular to materials and analytical chemistry. Recently, the unique features of perfluorinated compounds have reached the attention of the biochemists' audience. This tutorial review introduces the basic concepts of fluorous chemistry and illustrates its main biomolecular applications. Special attention has been given to fluorous microarrays and their combination with Mass-Spectroscopy (MS) techniques, to protein properties modification by the introduction of local fluorous domains, and to the most recent applications of (19)F-Magnetic Resonance Imaging ((19)F-MRI).
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Affiliation(s)
- Massimo Cametti
- NFMLab-DCMIC Giulio Natta, Politecnico di Milano, via Mancinelli 7, I-20131 Milan, Italy
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84
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Liu LJ, Chen LJ, Li P, Li XB, Liu JT. Optically Pure Polyfluoroalkanesulfinamides: Synthesis and Application as Promising and Monitorable Chiral Auxiliaries. J Org Chem 2011; 76:4675-81. [DOI: 10.1021/jo200119x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Li-Juan Liu
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Ling-Jun Chen
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Peng Li
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Xiao-Bo Li
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Jin-Tao Liu
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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85
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Fustero S, Sánchez-Roselló M, Báez C, del Pozo C, García Ruano JL, Alemán J, Marzo L, Parra A. Asymmetric synthesis of quaternary α-amino acid derivatives and their fluorinated analogues. Amino Acids 2011; 41:559-73. [DOI: 10.1007/s00726-011-0881-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Accepted: 03/04/2011] [Indexed: 10/18/2022]
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86
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Qu W, Zha Z, Ploessl K, Lieberman BP, Zhu L, Wise DR, Thompson CB, Kung HF. Synthesis of optically pure 4-fluoro-glutamines as potential metabolic imaging agents for tumors. J Am Chem Soc 2010; 133:1122-33. [PMID: 21190335 DOI: 10.1021/ja109203d] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A versatile synthetic route to prepare all four stereoisomeric 4-fluoro-glutamines was developed by exploiting a Passerini three-component reaction. The skeleton of 4-substituted glutamine derivatives was efficiently constructed. Subsequent four-step reactions, highlighted by a "neutralized" TASF fluorination, provided the desired products with high yields and excellent optical purity. The optically pure fluorine-18 labeled 4-fluoroglutamines were also successfully prepared using either a 18-crown-6/KHCO(3) or K[222]/K(2)CO(3) catalysis system. Preliminary cell uptake and inhibition studies using the 9L tumor cells and SF188(Bcl-xL) tumor cells (a glutamine addicted tumor derived from glioblastoma) provided strong evidence for their potential application in conjunction with positron emission tomography (PET) for in vivo imaging of tumors, which use glutamine as an alternative energy source.
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Affiliation(s)
- Wenchao Qu
- Department of Radiology, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
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87
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Lee A, Mirica KA, Whitesides GM. Influence of fluorocarbon and hydrocarbon acyl groups at the surface of bovine carbonic anhydrase II on the kinetics of denaturation by sodium dodecyl sulfate. J Phys Chem B 2010; 115:1199-210. [PMID: 21182314 DOI: 10.1021/jp107765h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
This paper examines the influence of acylation of the Lys-ε-NH(3)(+) groups of bovine carbonic anhydrase (BCA, EC 4.2.1.1) to Lys-ε-NHCOR (R = -CH(3), -CH(2)CH(3), and -CH(CH(3))(2), -CF(3)) on the rate of denaturation of this protein in buffer containing sodium dodecyl sulfate (SDS). Analysis of the rates suggested separate effects due to electrostatic charge and hydrophobic interactions. Rates of denaturation (k(Ac,n)) of each series of acylated derivatives depended on the number of acylations (n). Plots of log k(Ac,n) vs n followed U-shaped curves. Within each series of derivatives, rates of denaturation decreased as n increased to ∼7; this decrease was compatible with increasingly unfavorable electrostatic interactions between SDS and protein. In this range of n, rates of denaturation also depended on the choice of the acyl group as n increased to ∼7, in a manner compatible with favorable hydrophobic interactions between SDS and the -NHCOR groups. As n increased in the range 7 < n < 14, however, rates of denaturation stayed approximately constant; analysis suggested that these rates were compatible with an increasingly important contribution to denaturation that depended both on the net negative charge of the protein and on the hydrophobicity of the R group. The mechanism of denaturation thus seems to change with the extent of acylation of the protein. For derivatives with the same net electrostatic charge, rates of denaturation increased with the acyl group (by a factor of ∼3 for n ∼ 14) in the order CH(3)CONH- < CH(3)CH(2)CONH- < (CH(3))(2)CHCONH- < CF(3)CONH-. These results suggested that the hydrophobicity of CF(3)CONH- is slightly greater (by a factor of <2) than that of RHCONH- with similar surface area.
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Affiliation(s)
- Andrew Lee
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusettes 02138, USA
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88
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Wang J, Lin D, Zhou S, Ding X, Soloshonok VA, Liu H. Asymmetric synthesis of sterically and electronically demanding linear ω-trifluoromethyl containing amino acids via alkylation of chiral equivalents of nucleophilic glycine and alanine. J Org Chem 2010; 76:684-7. [PMID: 21182272 DOI: 10.1021/jo102031b] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An operationally convenient, scalable asymmetric synthesis of linear, ω-trifluoromethyl-containing amino acids, which were not previously produced in their enantiomerically pure form, has been developed via alkylation of chiral equivalents of nucleophilic glycine and alanine. The simplicity of the experimental procedures and high stereochemical outcome (yields up to 90% and diastereoselectivity up to 99%) of the presented method render these fluorinated amino acids readily available for systematic medicinal chemistry studies and de novo peptide design.
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Affiliation(s)
- Jiang Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu chong zhi Road, Shanghai 201203, People's Republic of China
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89
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Enders D, Gottfried K, Raabe G. Organocatalytic Enantioselective Strecker Synthesis of α-Quaternary α-Trifluoromethyl Amino Acids. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000666] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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90
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Kwon OH, Yoo TH, Othon CM, Van Deventer JA, Tirrell DA, Zewail AH. Hydration dynamics at fluorinated protein surfaces. Proc Natl Acad Sci U S A 2010; 107:17101-6. [PMID: 20855583 PMCID: PMC2951393 DOI: 10.1073/pnas.1011569107] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Water-protein interactions dictate many processes crucial to protein function including folding, dynamics, interactions with other biomolecules, and enzymatic catalysis. Here we examine the effect of surface fluorination on water-protein interactions. Modification of designed coiled-coil proteins by incorporation of 5,5,5-trifluoroleucine or (4S)-2-amino-4-methylhexanoic acid enables systematic examination of the effects of side-chain volume and fluorination on solvation dynamics. Using ultrafast fluorescence spectroscopy, we find that fluorinated side chains exert electrostatic drag on neighboring water molecules, slowing water motion at the protein surface.
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Affiliation(s)
- Oh-Hoon Kwon
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125; and
- Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125
| | - Tae Hyeon Yoo
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125; and
| | - Christina M. Othon
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125; and
- Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125
| | - James A. Van Deventer
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125; and
| | - David A. Tirrell
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125; and
| | - Ahmed H. Zewail
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125; and
- Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125
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91
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Chaume G, Barbeau O, Lesot P, Brigaud T. Synthesis of 2-trifluoromethyl-1,3-oxazolidines as hydrolytically stable pseudoprolines. J Org Chem 2010; 75:4135-45. [PMID: 20481551 DOI: 10.1021/jo100518t] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Trifluoromethyl group containing oxazolidines (Fox) are conveniently synthesized by condensation of serine esters with trifluoroacetaldehyde hemiacetal or trifluoroacetone. These oxazolidines can undergo N-acylation and amidification reactions and are completely configurationally and hydrolytically stable. Therefore, they can be considered as highly valuable proline surrogates (Tfm-pseudoprolines).
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Affiliation(s)
- Grégory Chaume
- Laboratoire SOSCO, Université de Cergy-Pontoise, 5 Mail Gay-Lussac, Neuville sur Oise, 95000 Cergy-Pontoise cedex, France
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92
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93
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Hartmann CE, Baumann T, Bächle M, Bräse S. Asymmetric synthesis of deuterated and fluorinated aromatic α,α-disubstituted amino acid derivatives. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.04.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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94
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Yajima T, Tonoi T, Nagano H, Tomita Y, Mikami K. Direct Racemic Mixture Synthesis of Fluorinated Amino Acids by Perfluoroalkyl Radical Addition to Dehydroamino Acids Terminated by Asymmetric Protonation. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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95
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Ye S, Ann Berger A, Petzold D, Reimann O, Matt B, Koksch B. Chemical aminoacylation of tRNAs with fluorinated amino acids for in vitro protein mutagenesis. Beilstein J Org Chem 2010; 6:40. [PMID: 20502658 PMCID: PMC2874332 DOI: 10.3762/bjoc.6.40] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Accepted: 03/23/2010] [Indexed: 01/11/2023] Open
Abstract
This article describes the chemical aminoacylation of the yeast phenylalanine suppressor tRNA with a series of amino acids bearing fluorinated side chains via the hybrid dinucleotide pdCpA and ligation to the corresponding truncated tRNA species. Aminoacyl-tRNAs can be used to synthesize biologically relevant proteins which contain fluorinated amino acids at specific sites by means of a cell-free translation system. Such engineered proteins are expected to contribute to our understanding of discrete fluorines' interaction with canonical amino acids in a native protein environment and to enable the design of fluorinated proteins with arbitrary desired properties.
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Affiliation(s)
- Shijie Ye
- Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Institute of Chemistry and Biochemistry – Organic Chemistry, Takustrasse 3, 14195 Berlin, Germany; Tel.: 0049-30-83855344; Fax: 0049-30-83855644
| | - Allison Ann Berger
- Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Institute of Chemistry and Biochemistry – Organic Chemistry, Takustrasse 3, 14195 Berlin, Germany; Tel.: 0049-30-83855344; Fax: 0049-30-83855644
| | - Dominique Petzold
- Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Institute of Chemistry and Biochemistry – Organic Chemistry, Takustrasse 3, 14195 Berlin, Germany; Tel.: 0049-30-83855344; Fax: 0049-30-83855644
| | - Oliver Reimann
- Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Institute of Chemistry and Biochemistry – Organic Chemistry, Takustrasse 3, 14195 Berlin, Germany; Tel.: 0049-30-83855344; Fax: 0049-30-83855644
| | - Benjamin Matt
- Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Institute of Chemistry and Biochemistry – Organic Chemistry, Takustrasse 3, 14195 Berlin, Germany; Tel.: 0049-30-83855344; Fax: 0049-30-83855644
| | - Beate Koksch
- Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Institute of Chemistry and Biochemistry – Organic Chemistry, Takustrasse 3, 14195 Berlin, Germany; Tel.: 0049-30-83855344; Fax: 0049-30-83855644
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96
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Salwiczek M, Mikhailiuk PK, Afonin S, Komarov IV, Ulrich AS, Koksch B. Compatibility of the conformationally rigid CF3-Bpg side chain with the hydrophobic coiled-coil interface. Amino Acids 2010; 39:1589-93. [PMID: 20386938 DOI: 10.1007/s00726-010-0581-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Accepted: 03/22/2010] [Indexed: 11/28/2022]
Abstract
3-(trifluoromethyl)bicyclopent-[1.1.1]-1-yl glycine (CF3-Bpg) has previously been established as a useful 19F NMR label to analyse the structures of oligomeric membrane-active peptides or transmembrane segments. To systematically examine the effect of side chain volume, conformational rigidity, and hydrophobicity of CF3-Bpg in polypeptide environments the amino acid was incorporated into an established coiled-coil based screening system. A single substitution of either valine (position a16) or leucine (position d19) within the hydrophobic core of the heteromeric coiled coil has practically no effect on its structure. Despite its comparatively high hydrophobicity, however, the stiff and bulky side chain of CF3-Bpg is not so well accommodated by the hydrophobic core as it leads to a more pronounced destabilization than observed for other, more polar fluorinated amino acids which carry more flexible side chains. CF3-Bpg is therefore a useful 19F NMR label, though not for monitoring the stability of such helix-helix interactions.
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Affiliation(s)
- Mario Salwiczek
- Department of Biology, Chemistry, Pharmacy, Institute of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195, Berlin, Germany
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97
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98
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Salwiczek M, Koksch B. Effects of fluorination on the folding kinetics of a heterodimeric coiled coil. Chembiochem 2010; 10:2867-70. [PMID: 19859931 DOI: 10.1002/cbic.200900518] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mario Salwiczek
- Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Germany
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99
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Maisch D, Wadhwani P, Afonin S, Böttcher C, Koksch B, Ulrich AS. Chemical labeling strategy with (R)- and (S)-trifluoromethylalanine for solid state 19F NMR analysis of peptaibols in membranes. J Am Chem Soc 2010; 131:15596-7. [PMID: 19827760 DOI: 10.1021/ja9067595] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Substitution of a single Aib-residue in a peptaibol with (R)- and (S)-trifluoromethylalanine yields two local orientational constraints theta by solid state (19)F NMR. The structure of the membrane-perturbing antibiotic alamethicin in DMPC bilayers was analyzed in terms of two angles tau and rho from six such constraints, showing that the N-terminus (up to a kink at Pro14) is folded as an alpha-helix, tilted away from the membrane normal by 8 degrees, and assembled as an oligomer. The new (19)F NMR label CF(3)-Ala has thus been demonstrated to be highly sensitive, virtually unperturbing, and ideally suited to characterize peptaibols in membranes.
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Affiliation(s)
- Daniel Maisch
- Karlsruhe Institute of Technology, Institut für Organische Chemie, Fritz-Haber-Weg 6, 76133 Karlsruhe, Germany
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100
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Vagt T, Nyakatura E, Salwiczek M, Jäckel C, Koksch B. Towards identifying preferred interaction partners of fluorinated amino acids within the hydrophobic environment of a dimeric coiled coil peptide. Org Biomol Chem 2010; 8:1382-6. [PMID: 20204211 DOI: 10.1039/b917205j] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Phage display technology has been applied to screen for preferred interaction partners of fluoroalkyl-substituted amino acids from the pool of the 20 canonical amino acids. A parallel, heterodimeric alpha-helical coiled coil was designed such that one peptide strand contained one of three different fluorinated amino acids within the hydrophobic core. The direct interaction partners within the second strand of the dimer were randomized and coiled coil pairing selectivity was used as a parameter to screen for the best binding partners within the peptide library. It was found that despite their different structures, polarities and fluorine contents, the three non-natural amino acids used in this study prefer the same interaction partners as the canonical, hydrophobic amino acids. The same technology can be used to study any kind of non-canonical amino acids. The emerging results will provide the basis not only for a profound understanding of the properties of these building blocks, but also for the de novo design of proteins with superior properties and new functions.
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Affiliation(s)
- Toni Vagt
- Institute of Chemistry and Biochemistry-Organic Chemistry, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany
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