Direct, expedient solid phase synthesis of large, monodisperse mannosylated dendrons in a peptide synthesizer and fluorescence labeling for imaging applications

Abstract : Fluorophore-labeled glycodendrimers have potential use in the study of carbohydrate–protein interactions by fluorescence spectroscopy and imaging methods. The current solution-phase methods for preparation of such glycoconjugates are labour intensive. On the other hand, the intrinsically more efficient solid-phase methods have been explored only at low generations. Herein we disclose a direct, expedient glycodendrimer synthesis from commercially available or easily prepared building blocks by machine-assisted solid-phase peptide synthesis (SPPS). Large, monodisperse 4th- and 5th-generation polylysine dendrons are prepared and capped with 16 and 32 mannose residues, respectively, in a single synthetic operation. Incorporation of a C-terminal lysine residue in the 4th-generation dendron allows fluorescence labelling with a number of common labels on resin, in organic solvent or in aqueous buffer, as required. A single HPLC purification is sufficient in all cases to obtain a homogeneous sample. The monodispersity of the glycodendrons is confirmed by MALDI-TOF. FITC-labeled 4th-generation glycodendron is an excellent probe for the imaging studies of mannose-receptor-mediated entry of into dendritic cells by confocal fluorescence microscopy.
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https://hal.archives-ouvertes.fr/hal-00282546
Contributor : Isabelle Frapart <>
Submitted on : Tuesday, May 27, 2008 - 5:07:01 PM
Last modification on : Wednesday, June 27, 2018 - 8:24:02 AM

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Eric Assen B. Kantchev, Chung-Chieh Chang, Shu-Fang Cheng, Annie-Claude Roche, Ding-Kwo Chang. Direct, expedient solid phase synthesis of large, monodisperse mannosylated dendrons in a peptide synthesizer and fluorescence labeling for imaging applications. Organic and Biomolecular Chemistry, Royal Society of Chemistry, 2008, 6 (8), pp.1377-1385. ⟨10.1039/b719737c⟩. ⟨hal-00282546⟩

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