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D'Amato A, Jiang L, Della Sala G, Kirshenbaum K, Costabile C, Furlan C, Gianolio E, Izzo I, De Riccardis F. Water-Soluble Chiral Cyclic Peptoids and Their Sodium and Gadolinium Complexes: Study of Conformational and Relaxometric Properties. J Org Chem 2023. [PMID: 37155983 DOI: 10.1021/acs.joc.2c02713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Cyclic peptoids are macrocyclic oligomers of N-substituted glycines with specific folding abilities and excellent metal binding properties. In this work, we show how strategic positioning of chiral (S)- and (R)-(1-carboxyethyl)glycine units influences the conformational stability of water-soluble macrocyclic peptoids as sodium complexes. The reported results are based on nuclear magnetic resonance spectroscopy, extensive computational studies, and X-ray diffraction analysis using single crystals grown from aqueous solutions. The studies include 1H relaxometric investigations of hexameric cyclic peptoids in the presence of the Gd3+ ion to assess their thermodynamic stabilities and relaxivities.
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Affiliation(s)
- Assunta D'Amato
- Department of Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II, 132, Fisciano, SA 84084, Italy
| | - Linhai Jiang
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003-6688, United States
| | - Giorgio Della Sala
- Department of Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II, 132, Fisciano, SA 84084, Italy
| | - Kent Kirshenbaum
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003-6688, United States
| | - Chiara Costabile
- Department of Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II, 132, Fisciano, SA 84084, Italy
| | - Chiara Furlan
- Department of Molecular Biotechnology and Health Sciences and Molecular Imaging Center, University of Turin, Via Nizza, 52, 10126 Turin, Italy
| | - Eliana Gianolio
- Department of Molecular Biotechnology and Health Sciences and Molecular Imaging Center, University of Turin, Via Nizza, 52, 10126 Turin, Italy
| | - Irene Izzo
- Department of Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II, 132, Fisciano, SA 84084, Italy
| | - Francesco De Riccardis
- Department of Chemistry and Biology "A. Zambelli", University of Salerno, Via Giovanni Paolo II, 132, Fisciano, SA 84084, Italy
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2
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Fuller AA, Moreno JL, Nguyen MT. Using Fluorescence to Enable Innovative Functions of Foldamers. Isr J Chem 2021. [DOI: 10.1002/ijch.202000109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Amelia A. Fuller
- Department of Chemistry & Biochemistry Santa Clara University 500 El Camino Real Santa Clara CA 95053 USA
| | - Jose L. Moreno
- Department of Chemistry & Biochemistry Santa Clara University 500 El Camino Real Santa Clara CA 95053 USA
| | - Michelle T. Nguyen
- Department of Chemistry & Biochemistry Santa Clara University 500 El Camino Real Santa Clara CA 95053 USA
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3
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Ghosh P, Rozenberg I, Maayan G. Sequence-function relationship within water-soluble Peptoid Chelators for Cu 2. J Inorg Biochem 2021; 217:111388. [PMID: 33618230 DOI: 10.1016/j.jinorgbio.2021.111388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/31/2021] [Accepted: 02/05/2021] [Indexed: 12/26/2022]
Abstract
Chelation of Cu2+ by synthetic molecules is an emerging therapeutic approach for treating several illnesses in human body such as Wilson disease, cancer and more. Among synthetic metal chelators, those based on peptoids - N-substituted glycine oligomers - are advantageous due to their structural similarity to peptides, ease of synthesis on solid support and versatile controlled sequences. Tuning peptoid sequences, via systematically changing at least one side chain, can facilitate and control their function. Along these lines, this work aims to explore the role of the non-coordinating side chain within peptoid chelators in order to understand the factors that control the selectivity of these chelators to Cu2+ in water medium. To this aim, a set of peptoid trimers having a pyridine group at the acetylated N-terminal, a 2,2'-bipyridine group at the second position and a non-coordinating group at the C-terminus, where the latter is systematically varied between aromatic, aliphatic, chiral or non-chiral, were investigated as selective chelators for Cu2+. The effect of the position of the non-coordinating group on the selectivity of the peptoid to Cu2+ was also tested. Based on extensive spectroscopic data, we found that the choice of the non-coordinating group along with its position dramatically influences the selectivity of the peptoids to Cu2+. We showed that peptoids having bulky chiral groups at the C-terminus enable high selectivity to Cu2+. We further demonstrated the ability of one of the selective chelators to remove Cu2+ from the natural copper binding protein metallothionein in HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) buffer medium.
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Affiliation(s)
- Pritam Ghosh
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Ido Rozenberg
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel.
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4
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Fuller AA, Jimenez CJ, Martinetto EK, Moreno JL, Calkins AL, Dowell KM, Huber J, McComas KN, Ortega A. Sequence Changes Modulate Peptoid Self-Association in Water. Front Chem 2020; 8:260. [PMID: 32391314 PMCID: PMC7191062 DOI: 10.3389/fchem.2020.00260] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 03/17/2020] [Indexed: 01/15/2023] Open
Abstract
Peptoids, N-substituted glycine oligomers, are a class of diverse and sequence-specific peptidomimetics with wide-ranging applications. Advancing the functional repertoire of peptoids to emulate native peptide and protein functions requires engineering peptoids that adopt regular secondary and tertiary structures. An understanding of how changes to peptoid sequence change structural features, particularly in water-soluble systems, is underdeveloped. To address this knowledge gap, five 15-residue water-soluble peptoids that include naphthalene-functionalized side chains were designed, prepared, and subjected to a structural study using a palette of techniques. Peptoid sequence designs were based on a putative amphiphilic helix peptoid bearing structure-promoting (S)-N-(1-naphthylethyl)glycine residues whose self-association in water has been studied previously. New peptoid variants reported here include sequence changes that influenced peptoid conformational flexibility, functional group patterning (amphiphilicity), and hydrophobicity. Peptoid structures were evaluated and compared using circular dichroism spectroscopy, fluorescence spectroscopy, and size exclusion chromatography. Spectral data confirmed that sequence changes alter peptoids' degree of assembly and the organization of self-assembled structures in aqueous solutions. Insights gained in these studies will inform the design of new water-soluble peptoids with regular structural features, including desirable higher-order (tertiary and quaternary) structural features.
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Affiliation(s)
- Amelia A Fuller
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Christian J Jimenez
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Ella K Martinetto
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Jose L Moreno
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Anna L Calkins
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Kalli M Dowell
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Jonathan Huber
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Kyra N McComas
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
| | - Alberto Ortega
- Department of Chemistry & Biochemistry, Santa Clara University, Santa Clara, CA, United States
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Castelletto V, Seitsonen J, Tewari KM, Hasan A, Edkins RM, Ruokolainen J, Pandey LM, Hamley IW, Lau KHA. Self-Assembly of Minimal Peptoid Sequences. ACS Macro Lett 2020; 9:494-499. [PMID: 32337093 PMCID: PMC7179723 DOI: 10.1021/acsmacrolett.9b01010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Accepted: 03/10/2020] [Indexed: 02/07/2023]
Abstract
Peptoids are biofunctional N-substituted glycine peptidomimics. Their self-assembly is of fundamental interest because they demonstrate alternatives to conventional peptide structures based on backbone chirality and beta-sheet hydrogen bonding. The search for self-assembling, water-soluble "minimal" sequences, be they peptide or peptidomimic, is a further challenge. Such sequences are highly desired for their compatibility with biomacromolecules and convenient synthesis for broader application. We report the self-assembly of a set of trimeric, water-soluble α-peptoids that exhibit a relatively low critical aggregation concentration (CAC ∼ 0.3 wt %). Cryo-EM and angle-resolved DLS show different sequence-dependent morphologies, namely uniform ca. 6 nm wide nanofibers, sheets, and clusters of globular assemblies. Absorbance and fluorescence spectroscopies indicate unique phenyl environments for π-interactions in the highly ordered nanofibers. Assembly of our peptoids takes place when the sequences are fully ionized, representing a departure from superficially similar amyloid-type hydrogen-bonded peptide nanostructures and expanding the horizons of assembly for sequence-specific bio- and biomimetic macromolecules.
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Affiliation(s)
| | - Jani Seitsonen
- Nanomicroscopy Center, Aalto
University, Puumiehenkuja
2, FIN-02150 Espoo, Finland
| | - Kunal M. Tewari
- Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K.
| | - Abshar Hasan
- Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K.
- Department
of Biosciences and Bioengineering, Indian
Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Robert M. Edkins
- Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K.
| | - Janne Ruokolainen
- Nanomicroscopy Center, Aalto
University, Puumiehenkuja
2, FIN-02150 Espoo, Finland
| | - Lalit M. Pandey
- Department
of Biosciences and Bioengineering, Indian
Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Ian W. Hamley
- Department of Chemistry, University of Reading, Reading RG6 6AD, U.K.
| | - King Hang Aaron Lau
- Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K.
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