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Beyer RL, Singh Y, Fairlie DP. Cyclooligomerization of a helix-bearing template into macrocycles bearing multiple helices. Org Lett 2008; 10:3481-4. [PMID: 18620416 DOI: 10.1021/ol801040c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cyclooligomerization was investigated for separating and spatially arranging helical peptides as discontinuous surfaces. Tetrapeptide H-[Ile-Ser-Lys(Ox)]-OH, containing a turn-inducing oxazole constraint, was connected through its lysine side chain via a beta-alanine linker to the C-terminus of a two-turn helical nonapeptide Ac-(cyclo-4,8)-LRL [KARAD](Aib). The resulting helix-appended template was self-condensed and cyclized to a library of macrocycles ( n = 2-6) containing multiple (2-6) helices. An NMR structure shows retention of alpha helicity in the cyclotrimer ( n = 3).
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Affiliation(s)
- Renée L Beyer
- Centre for Drug Design and Development, Institute for Molecular Bioscience, University of Queensland, Brisbane QLD 4072, Australia
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Dolphin GT, Chierici S, Ouberai M, Dumy P, Garcia J. A multimeric quinacrine conjugate as a potential inhibitor of Alzheimer's beta-amyloid fibril formation. Chembiochem 2008; 9:952-63. [PMID: 18330854 DOI: 10.1002/cbic.200700602] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Amyloid formation and accumulation of the amyloid beta-peptide (Abeta) in the brain is associated with Alzheimer's disease (AD) pathogenesis. Therefore, among the therapeutic approaches in development to fight the disease, the direct inhibition of the Abeta self-assembly process is currently widely investigated and is one of the most promising approaches. In this study we investigated the potential of a multimeric display of quinacrine derivatives, as compared to the monomer quinacrine, as a design principal for a novel class of inhibitors against Abeta fibril formation. The presented multimeric conjugate exhibits a cluster of four quinacrine derivatives on a rigid cyclopeptidic scaffold. Herein is reported the synthesis of the conjugate, together with the in vitro inhibitory evaluation of Abeta(1-40) fibrils using the thioflavin T fluorescence assay, and imaging with atomic force microscopy. Our data show that the multimeric compound inhibits Abeta(1-40) fibril formation with an IC(50) value of 20+/-10 microM, which contrasts with the nonactive monomeric analogue. This work suggests that assembling multiple copies of acridine moieties to a central scaffold, for multiple interactions, is a promising strategy for the engineering of inhibitors against Abeta fibril formation.
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Affiliation(s)
- Gunnar T Dolphin
- Département de Chimie Moléculaire, UMR 5250, ICMG FR-2607, CNRS, Université Joseph Fourier, B.P. 53, 38041 Grenoble Cedex 9, France
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Alfonso I, Bolte M, Bru M, Burguete MI, Luis SV, Rubio J. Supramolecular Control for the Modular Synthesis of Pseudopeptidic Macrocycles through an Anion-Templated Reaction. J Am Chem Soc 2008; 130:6137-44. [DOI: 10.1021/ja710132c] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ignacio Alfonso
- Departamento de Química Orgánica Biológica, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas (IIQAB-CSIC), Jordi Girona, 18-26, E-08034, Barcelona, Spain, Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany, Departamento de Química Inorgánica y Orgánica, UAMOA, Universidad Jaume I/CSIC, Campus del Riu Sec, Avenida Sos Baynat, s/n, E-12071, Castellón, Spain
| | - Michael Bolte
- Departamento de Química Orgánica Biológica, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas (IIQAB-CSIC), Jordi Girona, 18-26, E-08034, Barcelona, Spain, Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany, Departamento de Química Inorgánica y Orgánica, UAMOA, Universidad Jaume I/CSIC, Campus del Riu Sec, Avenida Sos Baynat, s/n, E-12071, Castellón, Spain
| | - Miriam Bru
- Departamento de Química Orgánica Biológica, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas (IIQAB-CSIC), Jordi Girona, 18-26, E-08034, Barcelona, Spain, Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany, Departamento de Química Inorgánica y Orgánica, UAMOA, Universidad Jaume I/CSIC, Campus del Riu Sec, Avenida Sos Baynat, s/n, E-12071, Castellón, Spain
| | - M. Isabel Burguete
- Departamento de Química Orgánica Biológica, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas (IIQAB-CSIC), Jordi Girona, 18-26, E-08034, Barcelona, Spain, Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany, Departamento de Química Inorgánica y Orgánica, UAMOA, Universidad Jaume I/CSIC, Campus del Riu Sec, Avenida Sos Baynat, s/n, E-12071, Castellón, Spain
| | - Santiago V. Luis
- Departamento de Química Orgánica Biológica, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas (IIQAB-CSIC), Jordi Girona, 18-26, E-08034, Barcelona, Spain, Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany, Departamento de Química Inorgánica y Orgánica, UAMOA, Universidad Jaume I/CSIC, Campus del Riu Sec, Avenida Sos Baynat, s/n, E-12071, Castellón, Spain
| | - Jenifer Rubio
- Departamento de Química Orgánica Biológica, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas (IIQAB-CSIC), Jordi Girona, 18-26, E-08034, Barcelona, Spain, Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt am Main, Germany, Departamento de Química Inorgánica y Orgánica, UAMOA, Universidad Jaume I/CSIC, Campus del Riu Sec, Avenida Sos Baynat, s/n, E-12071, Castellón, Spain
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