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Park SM, Kwon CH. Deciphering the conformational preference and ionization dynamics of tetrahydrofuran: Insights from advanced spectroscopic techniques. J Chem Phys 2024; 160:114308. [PMID: 38497473 DOI: 10.1063/5.0186570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 03/04/2024] [Indexed: 03/19/2024] Open
Abstract
Tetrahydrofuran (THF) has garnered significant attention due to its pivotal role in biological and chemical processes. The diverse array of conformations exhibited by THF profoundly impacts its reactivity and interactions with other molecules. Understanding these conformational preferences is crucial for comprehending its molecular behavior. In this study, we utilize infrared (IR) resonant vacuum ultraviolet photoionization/mass-analyzed threshold ionization (VUV-PI/MATI) mass spectroscopies to capture distinctive vibrational spectra of individual conformers, namely, "twisted" and "bent," within THF. Our conformer-specific vibrational spectra provide valuable insights into the relative populations of these two conformers. The analysis reveals that the twisted (C2) conformer is more stable than the bent (CS) conformer by 17 ± 15 cm-1. By precisely tuning the VUV photon energy to coincide with vibrational excitation via IR absorption, we selectively ionize specific conformers, yielding two-photon IR + VUV-PI/MATI spectra corresponding to the twisted and bent conformers. This investigation conclusively affirms that both the twisted and bent conformers coexist in the neutral state, while only the twisted conformer exists in the cationic state. These findings not only bridge gaps in existing knowledge but also provide profound insights into the behavior of this pivotal molecule in the realms of biology and medicine.
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Affiliation(s)
- Sung Man Park
- Department of Chemistry and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Chan Ho Kwon
- Department of Chemistry and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Republic of Korea
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2
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Mahmoud A, Toth I, Stephenson R. Developing an Effective Glycan‐Based Vaccine for
Streptococcus Pyogenes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Asmaa Mahmoud
- School of Chemistry and Molecular Biosciences The University of Queensland St Lucia Australia
| | - Istvan Toth
- School of Chemistry and Molecular Biosciences The University of Queensland Woolloongabba Australia
- School of Pharmacy The Universitry of Queensland St Lucia Australia
- Institue for Molecular Biosciences The University of Queensland St Lucia Australia
| | - Rachel Stephenson
- School of Chemistry and Molecular Biosciences The University of Queensland St Lucia Australia
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3
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Mahmoud A, Toth I, Stephenson R. Developing an Effective Glycan-based Vaccine for Streptococcus Pyogenes. Angew Chem Int Ed Engl 2021; 61:e202115342. [PMID: 34935243 DOI: 10.1002/anie.202115342] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Indexed: 11/11/2022]
Abstract
Streptococcus pyogenes is a primary infective agent that causes approximately 700 million human infections each year, resulting in more than 500,000 deaths. Carbohydrate-based vaccines are proven to be one of the most promising subunit vaccine candidates, as the bacterial glycan pattern(s) are different from mammalian cells and show increased pathogen serotype conservancy than the protein components. In this review we highlight reverse vaccinology for use in the development of subunit vaccines against S. pyogenes, and report reproducible methods of carbohydrate antigen production, in addition to the structure-immunogenicity correlation between group A carbohydrate epitopes and alternative vaccine antigen carrier systems. We also report recent advances used to overcome hurdles in carbohydrate-based vaccine development.
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Affiliation(s)
- Asmaa Mahmoud
- The University of Queensland - Saint Lucia Campus: The University of Queensland, School of Chemistry and Molecular Biosciences, AUSTRALIA
| | - Istvan Toth
- The University of Queensland - Saint Lucia Campus: The University of Queensland, School of Chemistry and Molecular Biosciences, AUSTRALIA
| | - Rachel Stephenson
- The University of Queensland, School of Chemistry and Molecular Biosciences, The University of Queensland, 4068, Brisbane, AUSTRALIA
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4
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Tyrikos-Ergas T, Fittolani G, Seeberger PH, Delbianco M. Structural Studies Using Unnatural Oligosaccharides: Toward Sugar Foldamers. Biomacromolecules 2019; 21:18-29. [DOI: 10.1021/acs.biomac.9b01090] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Theodore Tyrikos-Ergas
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
- Department of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Giulio Fittolani
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
- Department of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Peter H. Seeberger
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
- Department of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Martina Delbianco
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
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5
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Richard M, Felten AS, Chrétien F, Averlant-Petit MC, Pellegrini-Moïse N. Synthesis and conformational studies of short mixed γ/α-glycopeptides based on sugar γ 3,3 -amino acids. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.10.038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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6
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Rjabovs V, Ostrovskis P, Posevins D, Kiseļovs G, Kumpiņš V, Mishnev A, Turks M. Synthesis of Building Blocks for Carbopeptoids and Their Triazole Isoster Assembly. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500695] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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7
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Oligomers and peptidomimetics consisting of methyl 3-amino-2,3-dideoxyhexopyranosiduronic acids. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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8
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Pawar NJ, Sidhu NS, Sheldrick GM, Dhavale DD, Diederichsen U. Molecular architecture with carbohydrate functionalized β-peptides adopting 314-helical conformation. Beilstein J Org Chem 2014; 10:948-55. [PMID: 24991244 PMCID: PMC4077383 DOI: 10.3762/bjoc.10.93] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2013] [Accepted: 03/31/2014] [Indexed: 12/14/2022] Open
Abstract
Carbohydrate recognition is essential in cellular interactions and biological processes. It is characterized by structural diversity, multivalency and cooperative effects. To evaluate carbohydrate interaction and recognition, the structurally defined attachment of sugar units to a rigid template is highly desired. β-Peptide helices offer conformationally stable templates for the linear presentation of sugar units in defined distances. The synthesis and β-peptide incorporation of sugar-β-amino acids are described providing the saccharide units as amino acid side chain. The respective sugar-β-amino acids are accessible by Michael addition of ammonia to sugar units derivatized as α,β-unsaturated esters. Three sugar units were incorporated in β-peptide oligomers varying the sugar (glucose, galactose, xylose) and sugar protecting groups. The influence of sugar units and the configuration of sugar-β-amino acids on β-peptide secondary structure were investigated by CD spectroscopy.
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Affiliation(s)
- Nitin J Pawar
- Institute for Organic and Biomolecular Chemistry, Georg-August University Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
- Department of Chemistry, Garware Research Centre, University of Pune, Pune 411 007, India
| | - Navdeep S Sidhu
- Institute for Inorganic Chemistry, Georg-August University Göttingen, Tammannstraße 4, D-37077 Göttingen, Germany
| | - George M Sheldrick
- Institute for Inorganic Chemistry, Georg-August University Göttingen, Tammannstraße 4, D-37077 Göttingen, Germany
| | - Dilip D Dhavale
- Department of Chemistry, Garware Research Centre, University of Pune, Pune 411 007, India
| | - Ulf Diederichsen
- Institute for Organic and Biomolecular Chemistry, Georg-August University Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
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9
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Abstract
Although carbohydrates represent one of the most important families of biomolecules, they remain under-studied in comparison to the other biomolecular families (peptides, nucleobases). Beyond their best-known function of energy source in living systems, they act as mediator of molecular recognition processes, carrying molecular information in the so-called "sugar code," just to name one of their countless functions. Owing to their high conformational flexibility, they encode extremely rich information conveyed via the non-covalent hydrogen bonds within the carbohydrate and with other biomolecular assemblies, such as peptide subunits of proteins. Over the last decade there has been tremendous progress in the study of the conformational preferences of neutral oligosaccharides, and of the interactions between carbohydrates and various molecular partners (water, aromatic models, and peptide models), using vibrational spectroscopy as a sensitive probe. In parallel, other spectroscopic techniques have recently become available to the study of carbohydrates in the gas phase (microwave spectroscopy, IRMPD on charged species).
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Affiliation(s)
- Emilio J Cocinero
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV - EHU), Apartado 644, 48940, Bilbao, Spain,
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10
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A compendium of cyclic sugar amino acids and their carbocyclic and heterocyclic nitrogen analogues. Amino Acids 2013; 45:613-89. [DOI: 10.1007/s00726-013-1521-1] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 05/21/2013] [Indexed: 12/19/2022]
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11
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Inter- versus intra-molecular cyclization of tripeptides containing tetrahydrofuran amino acids: a density functional theory study on kinetic control. J Mol Model 2012; 18:3181-97. [DOI: 10.1007/s00894-011-1326-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 12/02/2011] [Indexed: 10/14/2022]
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12
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Sugar–amino acid cyclic conjugates as novel conformationally constrained hydroxyethylamine transition-state isosteres. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.04.086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Payal RS, Bharath R, Periyasamy G, Balasubramanian S. Density Functional Theory Investigations on the Structure and Dissolution Mechanisms for Cellobiose and Xylan in an Ionic Liquid: Gas Phase and Cluster Calculations. J Phys Chem B 2012; 116:833-40. [DOI: 10.1021/jp207989w] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Rajdeep Singh Payal
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advance Scientific Research, Jakkur, Bangalore 560064, India
| | - R. Bharath
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advance Scientific Research, Jakkur, Bangalore 560064, India
| | - Ganga Periyasamy
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advance Scientific Research, Jakkur, Bangalore 560064, India
| | - S. Balasubramanian
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advance Scientific Research, Jakkur, Bangalore 560064, India
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14
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Chakraborty TK, Kumar NVS, Roy S, Dutta SK, Kunwar AC, Sridhar B, Singh H. Stereochemical control in the structures of linear δ
,α
-hybrid tripeptides containing tetrahydrofuran amino acids. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1818] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Simone MI, Edwards AA, Cowley AR, Fleet GWJ, Watkin DJ. (3R,4R,5R)-5-(Acetamido-meth-yl)-N-benzyl-3,4-dihy-droxy-tetra-hydro-furan-3-carboxamide. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o2750-1. [PMID: 21588955 PMCID: PMC3009327 DOI: 10.1107/s1600536810039589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Accepted: 10/04/2010] [Indexed: 05/26/2023]
Abstract
X-ray crystallographic analysis with Cu Kα radiation established the relative configurations of the stereogenic centers in the title compound, C(15)H(20)N(2)O(5), and clarified mechanistic ambiguities in the synthesis. The conformation of the five-membered ring approximates twisted, about a C-O bond. The absolute configuration of this carbon-branched dipeptide isostere was known based on the use of d-ribose as the starting material. Refinement of the Flack parameter gave an ambiguous result but the refined Hooft parameter is in agreement with the assumed (d-ribose) absolute structure. The crystal structure consists of N-H⋯O and O-H⋯O hydrogen-bonded bi-layers, with the terminal methyl and phenyl groups forming a hydro-phobic inter-layer inter-face. Some weak C-H⋯O inter-actions are also present.
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Affiliation(s)
- Michela I Simone
- Chemistry Research Laboratory, University of, Oxford, Mansfield Road, Oxford, OX1 3TA, England
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16
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An efficient route towards a new branched tetrahydrofurane δ-sugar amino acid from a pyrolysis product of cellulose. Amino Acids 2010; 40:633-40. [PMID: 20658159 DOI: 10.1007/s00726-010-0690-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 07/06/2010] [Indexed: 12/24/2022]
Abstract
(1R,5S)-1-hydroxy-3,6-dioxa-bicyclo[3.2.1]octan-2-one, is a bicyclic lactone obtained in gram-scale by catalytic pyrolysis of the renewable source cellulose. Now it has been used as a chiral building block in the preparation of the new δ-sugar amino acid, (3R,5S)-5-(aminoethyl)-3-hydroxytetrahydrofurane-3-carboxylic acid, by an efficient synthesis in five steps with a 67% overall yield. The structure of this tetrahydrofurane amino acid, isolated in protonated form, was assigned by extensive mono- and bidimensional (1)H- and (13)C-NMR analysis and mass spectrometry, including measurements by electrospray and matrix-assisted laser desorption ionization techniques, the latter one for high-resolution experiments. This amino acid is an isoster of dipeptide glycine-alanine (H-Gly-Ala-OH), with a potential use in the access of new peptidomimetics with conformationally restricted structures due to the presence of tetrahydrofurane ring. As a preliminary study in order to disclose this effect, density functional theory calculation performed in water using polar continuum model was applied to the new amino acid and H-Gly-Ala-OH dipeptide, so that to evaluate and compare the relative torsional angles for the energy-minimized structures.
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17
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Jiménez Blanco JL, Ortega-Caballero F, Ortiz Mellet C, García Fernández JM. (Pseudo)amide-linked oligosaccharide mimetics: molecular recognition and supramolecular properties. Beilstein J Org Chem 2010; 6:20. [PMID: 20485602 PMCID: PMC2870983 DOI: 10.3762/bjoc.6.20] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Accepted: 02/11/2010] [Indexed: 01/04/2023] Open
Abstract
Oligosaccharides are currently recognised as having functions that influence the entire spectrum of cell activities. However, a distinct disadvantage of naturally occurring oligosaccharides is their metabolic instability in biological systems. Therefore, much effort has been spent in the past two decades on the development of feasible routes to carbohydrate mimetics which can compete with their O-glycosidic counterparts in cell surface adhesion, inhibit carbohydrate processing enzymes, and interfere in the biosynthesis of specific cell surface carbohydrates. Such oligosaccharide mimetics are potential therapeutic agents against HIV and other infections, against cancer, diabetes and other metabolic diseases. An efficient strategy to access this type of compounds is the replacement of the glycosidic linkage by amide or pseudoamide functions such as thiourea, urea and guanidine. In this review we summarise the advances over the last decade in the synthesis of oligosaccharide mimetics that possess amide and pseudoamide linkages, as well as studies focussing on their supramolecular and recognition properties.
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Affiliation(s)
- José L Jiménez Blanco
- Department of Organic Chemistry, Faculty of Chemistry, University of Seville, Prof. García González 1, Seville 41012, Spain.
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18
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Synthesis and applications of a chiral-oxygenated 3-chloro-3,6-dihydro-2H-pyran obtained under Overman rearrangement conditions. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.10.136] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Cagmat EB, Szczepanski J, Pearson WL, Powell DH, Eyler JR, Polfer NC. Vibrational signatures of metal-chelated monosaccharide epimers: gas-phase infrared spectroscopy of Rb+-tagged glucuronic and iduronic acid. Phys Chem Chem Phys 2010; 12:3474-9. [DOI: 10.1039/b924027f] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Andreini M, Taillefumier C, Chrétien F, Thery V, Chapleur Y. Synthesis and Solution Conformation of Homo-β-peptides Consisting of N-Mannofuranosyl-3-ulosonic acids. J Org Chem 2009; 74:7651-9. [DOI: 10.1021/jo900966b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Manuel Andreini
- Groupe SUCRES, Nancy Université UMR 7565 Université Henri Poincaré, Nancy 1-CNRS, BP 70239, F-54506, Nancy-Vandoeuvre, France
| | - Claude Taillefumier
- Clermont Université, Université Blaise Pascal, Laboratoire SEESIB (UMR 6504−CNRS), F-63177 Aubière cedex, France
| | - Françoise Chrétien
- Groupe SUCRES, Nancy Université UMR 7565 Université Henri Poincaré, Nancy 1-CNRS, BP 70239, F-54506, Nancy-Vandoeuvre, France
| | - Vincent Thery
- Clermont Université, Université Blaise Pascal, Laboratoire SEESIB (UMR 6504−CNRS), F-63177 Aubière cedex, France
| | - Yves Chapleur
- Groupe SUCRES, Nancy Université UMR 7565 Université Henri Poincaré, Nancy 1-CNRS, BP 70239, F-54506, Nancy-Vandoeuvre, France
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21
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Hu Y, Bernstein ER. Vibrational and Photoionization Spectroscopy of Neutral Valine Clusters. J Phys Chem A 2009; 113:8454-61. [DOI: 10.1021/jp901208f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yongjun Hu
- MOE Key Lab of Laser Life Science & Institute of Laser Life Science, South China Normal University, Guangzhou 510631, P. R. China, and Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
| | - Elliot R. Bernstein
- MOE Key Lab of Laser Life Science & Institute of Laser Life Science, South China Normal University, Guangzhou 510631, P. R. China, and Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872
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22
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Sakota K, Shimazaki Y, Sekiya H. Formation of a dual hydrogen bond in the N–H⋯C=O moiety in the indole-(N-methylacetamide)1 cluster revealed by IR-dip spectroscopy with natural bond orbital analysis. J Chem Phys 2009; 130:231105. [DOI: 10.1063/1.3157254] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Rawal GK, Rani S, Kumari N, Vankar YD. Regio- and Stereocontrolled Selective Debenzylation and Substitution Reactions of C-2 Formyl Glycals. Application in the Synthesis of Constrained β-Sugar Amino Acids. J Org Chem 2009; 74:5349-55. [DOI: 10.1021/jo9008222] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Girish K. Rawal
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Shikha Rani
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Nitee Kumari
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Yashwant D. Vankar
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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Gloaguen E, Pollet R, Piuzzi F, Tardivel B, Mons M. Gas phase folding of an (Ala)4 neutral peptide chain: spectroscopic evidence for the formation of a β-hairpin H-bonding pattern. Phys Chem Chem Phys 2009; 11:11385-8. [DOI: 10.1039/b918670k] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Aguado E, León I, Cocinero EJ, Lesarri A, Fernández JA, Castaño F. Molecular recognition in the gas phase: benzocaine–phenol as a model of anaesthetic–receptor interaction. Phys Chem Chem Phys 2009; 11:11608-16. [DOI: 10.1039/b915325j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Edwards AA, Alexander BD, Fleet GWJ, Tranter GE. Spectroscopic studies of oligomers containing 2,5-trans furanoid sugar amino acids. Chirality 2008; 20:969-72. [PMID: 18311778 DOI: 10.1002/chir.20538] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Sugar amino acids and their oligomers, known as carbopeptoids, are commonly studied as foldamers. However, study of their conformational preference is often challenging when the adopted conformations are extended and/or disordered. This study is the first to explore the disordered nature of such carbopeptoids by utilizing a family of 2,5-trans carbopeptoids. An array of spectroscopic techniques has been used to investigate the conformational preference of these carbopeptoids. However, using this data alone it has not been possible to assign conformational preference as an ordered extended conformation or as a disordered family of closely related conformations. Computational methods need to be employed to achieve reliable interpretation of the spectroscopic data.
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Affiliation(s)
- Alison A Edwards
- Medway School of Pharmacy, Universities of Kent and Greenwich at Medway, Kent, United Kingdom.
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27
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Simone MI, Edwards AA, Tranter GE, Fleet GW. Carbon-branched δ-tetrahydrofuran sugar amino acids (SAAs) as dipeptide isostere scaffolds. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.12.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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