1
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Webster CS, Balduzzi F, Davis AP. Tricyclic octaurea "Temples" for the recognition of polar molecules in water. Org Biomol Chem 2023; 21:525-532. [PMID: 36533594 DOI: 10.1039/d2ob02061k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Two water-soluble tricyclic "Temple" macrocycles featuring pyrene roof/floor units and bis-urea spacers have been synthesised and studied as receptors for aromatic compounds in aqueous media. The tricycles show good selectivity for methylated purine alkaloids such as caffeine versus unsubstituted heterocycles such as adenine and indole. Binding is signalled by major changes in fluorescence, apparently due to the break-up of intramolecular excimers. The formation of excimers implies cavity collapse in the absence of guests explaining why, unlike an earlier relative, these receptors do not bind carbohydrates. Naphthalenediimides (NDIs) have also been studied as geometrically complementary guests, and indeed bind especially strongly (Ka > 107 M-1); this powerful and selective association suggests potential applications in supramolecular self-assembly.
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Affiliation(s)
- Claire S Webster
- University of Bristol, School of Chemistry, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Federica Balduzzi
- University of Bristol, School of Chemistry, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Anthony P Davis
- University of Bristol, School of Chemistry, Cantock's Close, Bristol, BS8 1TS, UK.
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2
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Milanesi F, Unione L, Ardá A, Nativi C, Jiménez-Barbero J, Roelens S, Francesconi O. Biomimetic Tweezers for N-Glycans: Selective Recognition of the Core GlcNAc 2 Disaccharide of the Sialylglycopeptide SGP. Chemistry 2023; 29:e202203591. [PMID: 36597924 DOI: 10.1002/chem.202203591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 01/02/2023] [Accepted: 01/03/2023] [Indexed: 01/05/2023]
Abstract
In recent years, glycomics have shown how pervasive the role of carbohydrates in biological systems is and how chemical tools are essential to investigate glycan function and modulate carbohydrate-mediated processes. Biomimetic receptors for carbohydrates can carry out this task but, although significant affinities and selectivities toward simple saccharides have been achieved, targeting complex glycoconjugates remains a goal yet unattained. In this work we report the unprecedented recognition of a complex biantennary sialylglycopeptide (SGP) by a tweezers-shaped biomimetic receptor, which selectively binds to the core GlcNAc2 disaccharide of the N-glycan with an affinity of 170 μM. Because of the simple structure and the remarkable binding ability, this biomimetic receptor can represent a versatile tool for glycoscience, opening the way to useful applications.
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Affiliation(s)
- Francesco Milanesi
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, University of Florence, Polo Scientifico e Tecnologico, I-50019 Sesto Fiorentino, Firenze, Italy.,Magnetic Resonance Center CERM, University of Florence, Via L. Sacconi 6, I-50019, Sesto Fiorentino, Firenze, Italy
| | - Luca Unione
- CICbioGUNE, Basque Research & Technology Alliance (BRTA), Bizkaia Technology Park, Building 800, 48160, Derio, Bizkaia, Spain.,Ikerbasque, Basque Foundation for Science, Maria Diaz de Haro 3, 48013, Bilbao, Bizkaia, Spain
| | - Ana Ardá
- CICbioGUNE, Basque Research & Technology Alliance (BRTA), Bizkaia Technology Park, Building 800, 48160, Derio, Bizkaia, Spain.,Ikerbasque, Basque Foundation for Science, Maria Diaz de Haro 3, 48013, Bilbao, Bizkaia, Spain
| | - Cristina Nativi
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, University of Florence, Polo Scientifico e Tecnologico, I-50019 Sesto Fiorentino, Firenze, Italy
| | - Jesús Jiménez-Barbero
- CICbioGUNE, Basque Research & Technology Alliance (BRTA), Bizkaia Technology Park, Building 800, 48160, Derio, Bizkaia, Spain.,Ikerbasque, Basque Foundation for Science, Maria Diaz de Haro 3, 48013, Bilbao, Bizkaia, Spain.,Department of Organic Chemistry, II Faculty of Science and Technology, University of the Basque Country, EHU-UPV, 48940, Leioa, Spain.,Centro de Investigación Biomédica En Red de Enfermedades Respiratorias, Madrid, Spain
| | - Stefano Roelens
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, University of Florence, Polo Scientifico e Tecnologico, I-50019 Sesto Fiorentino, Firenze, Italy
| | - Oscar Francesconi
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, University of Florence, Polo Scientifico e Tecnologico, I-50019 Sesto Fiorentino, Firenze, Italy
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3
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Francesconi O, Ienco A, Papi F, Dolce M, Catastini A, Nativi C, Roelens S. A Sulfonated Tweezer-Shaped Receptor Selectively Recognizes Caffeine in Water. J Org Chem 2022; 87:2662-2667. [PMID: 35107278 PMCID: PMC8902752 DOI: 10.1021/acs.joc.1c02620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The
selective recognition of caffeine in water among structurally
related xanthines and purine or pyrimidine bases was achieved by a
simple tweezer-shaped receptor featuring sulfonate hydrosolubilizing
groups. The remarkable affinity for caffeine, among the highest reported
thus far in the literature and larger than that shown by adenosine
receptors of all subtypes, stems from a synergistic combination of
hydrogen bonding, CH−π, and π-stacking interactions.
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Affiliation(s)
- Oscar Francesconi
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, Polo Scientifico e Tecnologico, University of Florence, I-50019 Firenze, Italy
| | - Andrea Ienco
- Istituto di Chimica dei Composti Organometallici, Consiglio Nazionale delle Ricerche (CNR), Via Madonna del Piano, I-50019 Firenze, Italy
| | - Francesco Papi
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, Polo Scientifico e Tecnologico, University of Florence, I-50019 Firenze, Italy
| | - Marta Dolce
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, Polo Scientifico e Tecnologico, University of Florence, I-50019 Firenze, Italy
| | - Andrea Catastini
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, Polo Scientifico e Tecnologico, University of Florence, I-50019 Firenze, Italy
| | - Cristina Nativi
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, Polo Scientifico e Tecnologico, University of Florence, I-50019 Firenze, Italy
| | - Stefano Roelens
- Department of Chemistry "Ugo Schiff" DICUS and INSTM, Polo Scientifico e Tecnologico, University of Florence, I-50019 Firenze, Italy
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4
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Francesconi O, Milanesi F, Nativi C, Roelens S. Molecular Recognition of Disaccharides in Water: Preorganized Macrocyclic or Adaptive Acyclic? Chemistry 2021; 27:10456-10460. [PMID: 33945180 PMCID: PMC8361761 DOI: 10.1002/chem.202101238] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Indexed: 12/02/2022]
Abstract
When facing the dilemma of following a preorganized or adaptive design approach in conceiving the architecture of new biomimetic receptors for carbohydrates, shape-persistent macrocyclic structures were most often chosen to achieve effective recognition of neutral saccharides in water. In contrast, acyclic architectures have seldom been explored, even though potentially simpler and more easily accessible. In this work, comparison of the binding properties of two structurally related diaminocarbazolic receptors, featuring a macrocyclic and an acyclic tweezer-shaped architecture, highlighted the advantages provided by the acyclic receptor in terms of selectivity in the recognition of 1,4-disaccharides of biological interest. Selective recognition of GlcNAc2 , the core fragment of N-glycans exposed on the surface of enveloped viruses, stands as an emblematic example. NMR spectroscopic data and molecular modeling calculations were used to ascertain the differences in binding mode and to shed light on the origin of recognition efficacy and selectivity.
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Affiliation(s)
- Oscar Francesconi
- Department of Chemistry “Ugo Schiff” and INSTMUniversity of FlorencePolo Scientifico e Tecnologico50019Sesto Fiorentino, FirenzeItaly
| | - Francesco Milanesi
- Department of Chemistry “Ugo Schiff” and INSTMUniversity of FlorencePolo Scientifico e Tecnologico50019Sesto Fiorentino, FirenzeItaly
- Magnetic Resonance Center CERMVia L. Sacconi 650019Sesto Fiorentino, FirenzeItaly
| | - Cristina Nativi
- Department of Chemistry “Ugo Schiff” and INSTMUniversity of FlorencePolo Scientifico e Tecnologico50019Sesto Fiorentino, FirenzeItaly
| | - Stefano Roelens
- Department of Chemistry “Ugo Schiff” and INSTMUniversity of FlorencePolo Scientifico e Tecnologico50019Sesto Fiorentino, FirenzeItaly
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5
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Francesconi O, Milanesi F, Nativi C, Roelens S. A Simple Biomimetic Receptor Selectively Recognizing the GlcNAc
2
Disaccharide in Water. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100560] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Oscar Francesconi
- Department of Chemistry “Ugo Schiff” and INSTM University of Florence, Polo Scientifico e Tecnologico 50019 Sesto Fiorentino Firenze Italy
| | - Francesco Milanesi
- Department of Chemistry “Ugo Schiff” and INSTM University of Florence, Polo Scientifico e Tecnologico 50019 Sesto Fiorentino Firenze Italy
- Magnetic Resonance Center CERM Via L. Sacconi 6 50019 Sesto Fiorentino Firenze Italy
| | - Cristina Nativi
- Department of Chemistry “Ugo Schiff” and INSTM University of Florence, Polo Scientifico e Tecnologico 50019 Sesto Fiorentino Firenze Italy
| | - Stefano Roelens
- Department of Chemistry “Ugo Schiff” and INSTM University of Florence, Polo Scientifico e Tecnologico 50019 Sesto Fiorentino Firenze Italy
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6
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Francesconi O, Milanesi F, Nativi C, Roelens S. A Simple Biomimetic Receptor Selectively Recognizing the GlcNAc 2 Disaccharide in Water. Angew Chem Int Ed Engl 2021; 60:11168-11172. [PMID: 33666317 PMCID: PMC8252438 DOI: 10.1002/anie.202100560] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 02/26/2021] [Indexed: 12/22/2022]
Abstract
GlcNAc2 is the core disaccharide fragment present in N-glycans exposed on the surface of enveloped viruses of high health concern, such as coronaviruses. Because N-glycans are directly involved in the docking of viruses to host cells, recognition of GlcNAc2 by a biomimetic receptor may be a convenient alternative to the use of lectins to interfere with viral entry and infection. Herein, we describe a simple biomimetic receptor recognizing the methyl-β-glycoside of GlcNAc2 in water with an unprecedented affinity of 160 μM, exceeding that of more structurally complex receptors reported in the literature. The tweezers-shaped acyclic structure exhibits marked selectivity among structurally related disaccharides, and complete discrimination between mono- and disaccharides. Molecular modelling calculations supported by NOE data provided a three-dimensional description of the binding mode, shedding light on the origin of the affinities and selectivities exhibited by the receptor.
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Affiliation(s)
- Oscar Francesconi
- Department of Chemistry "Ugo Schiff" and INSTM, University of Florence, Polo Scientifico e Tecnologico, 50019 Sesto Fiorentino, Firenze, Italy
| | - Francesco Milanesi
- Department of Chemistry "Ugo Schiff" and INSTM, University of Florence, Polo Scientifico e Tecnologico, 50019 Sesto Fiorentino, Firenze, Italy.,Magnetic Resonance Center CERM, Via L. Sacconi 6, 50019 Sesto Fiorentino, Firenze, Italy
| | - Cristina Nativi
- Department of Chemistry "Ugo Schiff" and INSTM, University of Florence, Polo Scientifico e Tecnologico, 50019 Sesto Fiorentino, Firenze, Italy
| | - Stefano Roelens
- Department of Chemistry "Ugo Schiff" and INSTM, University of Florence, Polo Scientifico e Tecnologico, 50019 Sesto Fiorentino, Firenze, Italy
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