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Socrier L, Ahadi S, Bosse M, Montag C, Werz DB, Steinem C. Optical Manipulation of Gb 3 Enriched Lipid Domains: Impact of Isomerization on Gb 3 -Shiga Toxin B Interaction. Chemistry 2023; 29:e202202766. [PMID: 36279320 PMCID: PMC10099549 DOI: 10.1002/chem.202202766] [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: 09/05/2022] [Indexed: 11/06/2022]
Abstract
The plasma membrane is a complex assembly of proteins and lipids that can self-assemble in submicroscopic domains commonly termed "lipid rafts", which are implicated in membrane signaling and trafficking. Recently, photo-sensitive lipids were introduced to study membrane domain organization, and photo-isomerization was shown to trigger the mixing and de-mixing of liquid-ordered (lo ) domains in artificial phase-separated membranes. Here, we synthesized globotriaosylceramide (Gb3 ) glycosphingolipids that harbor an azobenzene moiety at different positions of the fatty acid to investigate light-induced membrane domain reorganization, and that serve as specific receptors for the protein Shiga toxin (STx). Using phase-separated supported lipid bilayers on mica surfaces doped with four different photo-Gb3 molecules, we found by fluorescence microscopy and atomic force microscopy that liquid disordered (ld ) domains were formed within lo domains upon trans-cis photo-isomerization. The fraction and size of these ld domains were largest for Gb3 molecules with the azobenzene group at the end of the fatty acid. We further investigated the impact of domain reorganization on the interaction of the B-subunits of STx with the photo-Gb3 . Fluorescence and atomic force micrographs clearly demonstrated that STxB binds to the lo phase if Gb3 is in the trans-configuration, whereas two STxB populations are formed if the photo-Gb3 is switched to the cis-configuration highlighting the idea of manipulating lipid-protein interactions with a light stimulus.
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Affiliation(s)
- Larissa Socrier
- Max Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077, Göttingen, Germany.,Institute of Organic and Biomolecular Chemistry, Georg-August-Universität, Tammannstraße 2, 37077, Göttingen, Germany
| | - Somayeh Ahadi
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Mathias Bosse
- Institute for Medical Physics and Biophysics, University of Leipzig, Härtelstraße 16-18, 04107, Leipzig, Germany
| | - Cindy Montag
- Institute for Medical Physics and Biophysics, University of Leipzig, Härtelstraße 16-18, 04107, Leipzig, Germany
| | - Daniel B Werz
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany.,Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg, Germany
| | - Claudia Steinem
- Max Planck Institute for Dynamics and Self-Organization, Am Faßberg 17, 37077, Göttingen, Germany.,Institute of Organic and Biomolecular Chemistry, Georg-August-Universität, Tammannstraße 2, 37077, Göttingen, Germany
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Gupta MK, Sharma NK. A new amino acid, hybrid peptides and BODIPY analogs: synthesis and evaluation of 2-aminotroponyl-L-alanine (ATA) derivatives. Org Biomol Chem 2022; 20:9397-9407. [PMID: 36398538 DOI: 10.1039/d2ob01905a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Natural aromatic α-amino acid residues play critical roles in the structural and functional organization of proteins owing to π-interactions. Their aromatic residues are derived from benzenoid scaffolds. Non-benzenoid aromatic scaffolds such as tropone and tropolone are also constituents of troponoid natural products. Tropolone has also the ability to exhibit π-interactions along with additional hydrogen bonding. Thus, amino acids comprising troponyl could be potential building blocks of novel peptidomimetics. This report describes the synthesis of the L-aminotroponylalanine amino acid (ATA) and its unusual activity with the peptide coupling agent EDC. Importantly, its di-peptides form β-sheet/-turn type secondary structures in organic solvents owing to the troponyl residue. This amino acid is an excellent scaffold for the synthesis of fluorescent amino acids such as BODIPY amino acid analogs. Nevertheless, this amino acid and its BODIPY derivatives can enter HeLa cells without exhibiting significant cytotoxicity at low concentrations (∼50 μM). Hence, ATA and its BODIPY derivatives are promising aromatic amino acids for the construction of potential peptidomimetics and fluorescent labelling of target peptides.
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Affiliation(s)
- Manish K Gupta
- School of Chemical Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni Campus, Bhubaneswar-752050, Odisha, India. .,HBNI-Mumbai, Mumbai, India
| | - Nagendra K Sharma
- School of Chemical Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni Campus, Bhubaneswar-752050, Odisha, India. .,HBNI-Mumbai, Mumbai, India
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Patalag LJ, Ahadi S, Lashchuk O, Jones PG, Ebbinghaus S, Werz DB. GlycoBODIPYs: Sugars Serving as a Natural Stock for Water‐soluble Fluorescent Probes of Complex Chiral Morphology. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016764] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lukas J. Patalag
- TU Braunschweig Institute of Organic Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Somayeh Ahadi
- TU Braunschweig Institute of Organic Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Olesia Lashchuk
- TU Braunschweig Institute of Physical and Theoretical Chemistry, and Braunschweig Integrated Centre of Systems Biology Rebenring 56 38106 Braunschweig Germany
| | - Peter G. Jones
- TU Braunschweig Institute of Inorganic and Analytical Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Simon Ebbinghaus
- TU Braunschweig Institute of Physical and Theoretical Chemistry, and Braunschweig Integrated Centre of Systems Biology Rebenring 56 38106 Braunschweig Germany
| | - Daniel B. Werz
- TU Braunschweig Institute of Organic Chemistry Hagenring 30 38106 Braunschweig Germany
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Patalag LJ, Ahadi S, Lashchuk O, Jones PG, Ebbinghaus S, Werz DB. GlycoBODIPYs: Sugars Serving as a Natural Stock for Water-soluble Fluorescent Probes of Complex Chiral Morphology. Angew Chem Int Ed Engl 2021; 60:8766-8771. [PMID: 33492705 PMCID: PMC8048574 DOI: 10.1002/anie.202016764] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/11/2021] [Indexed: 12/31/2022]
Abstract
A range of unprocessed, reducing sugar substrates (mono-, di-, and trisaccharides) is shown to take part in a straightforward four-step synthetic route to water-soluble, uncharged BODIPY derivatives with unimpaired chiral integrity and high fluorescence efficiency. A wide compatibility with several postfunctionalizations is demonstrated, thus suggesting a universal utility of the multifunctional glycoconjugates, which we call GlycoBODIPYs. Knoevenagel condensations are able to promote a red-shift in the spectra, thereby furnishing strongly fluorescent red and far-red glycoconjugates of high hydrophilicity. The synthetic outcome was studied by X-ray crystallography and by comprehensive photophysical investigations in several solvent systems. Furthermore, cell experiments illustrate efficient cell uptake and demonstrate differential cell targeting as a function of the integrated chiral information.
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Affiliation(s)
- Lukas J. Patalag
- TU BraunschweigInstitute of Organic ChemistryHagenring 3038106BraunschweigGermany
| | - Somayeh Ahadi
- TU BraunschweigInstitute of Organic ChemistryHagenring 3038106BraunschweigGermany
| | - Olesia Lashchuk
- TU BraunschweigInstitute of Physical and Theoretical Chemistry, and Braunschweig Integrated Centre of Systems BiologyRebenring 5638106BraunschweigGermany
| | - Peter G. Jones
- TU BraunschweigInstitute of Inorganic and Analytical ChemistryHagenring 3038106BraunschweigGermany
| | - Simon Ebbinghaus
- TU BraunschweigInstitute of Physical and Theoretical Chemistry, and Braunschweig Integrated Centre of Systems BiologyRebenring 5638106BraunschweigGermany
| | - Daniel B. Werz
- TU BraunschweigInstitute of Organic ChemistryHagenring 3038106BraunschweigGermany
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Ahadi S, Awan SI, Werz DB. Total Synthesis of Tri-, Hexa- and Heptasaccharidic Substructures of the O-Polysaccharide of Providencia rustigianii O34. Chemistry 2020; 26:6264-6270. [PMID: 32092205 PMCID: PMC7318715 DOI: 10.1002/chem.202000496] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 02/20/2020] [Indexed: 12/22/2022]
Abstract
A general and efficient strategy for synthesis of tri‐, hexa‐ and heptasaccharidic substructures of the lipopolysaccharide of Providencia rustigianii O34 is described. For the heptasaccharide seven different building blocks were employed. Special features of the structures are an α‐linked galactosamine and the two embedded α‐fucose units, which are either branched at positions‐3 and ‐4 or further linked at their 2‐position. Convergent strategies focused on [4+3], [3+4], and [4+2+1] couplings. Whereas the [4+3] and [3+4] coupling strategies failed the [4+2+1] strategy was successful. As monosaccharidic building blocks trichloroacetimidates and phosphates were employed. Global deprotection of the fully protected structures was achieved by Birch reaction.
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Affiliation(s)
- Somayeh Ahadi
- Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106, Braunschweig, Germany
| | - Shahid I Awan
- Georg-August-Universität Göttingen, Institute of Organic and Biomolecular Chemistry, Tammannstraße 2, 37077, Göttingen, Germany
| | - Daniel B Werz
- Technische Universität Braunschweig, Institute of Organic Chemistry, Hagenring 30, 38106, Braunschweig, Germany
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