title: Direct solid-phase synthesis and fluorescence labeling of large, monodisperse mannosylated dendrons in a peptide synthesizer.
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.
authors.affiliation: Institute of Chemistry, Academia Sinica, 128 Sec. 2 Academia Rd, Nankang, Taipei 11529, Taiwan, ROC.
authors.forename: Eric Assen B
authors.initials: EA
authors.lastname: Kantchev
authors.forename: Chung-Chieh
authors.initials: CC
authors.lastname: Chang
authors.forename: Shu-Fang
authors.initials: SF
authors.lastname: Cheng
authors.forename: Annie-Claude
authors.initials: AC
authors.lastname: Roche
authors.forename: Ding-Kwo
authors.initials: DK
authors.lastname: Chang
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D020650:Combinatorial Chemistry Techniques; D050091:Dendrimers / Q000138:chemical synthesis* / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry; D006001:Glycoconjugates / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure; D010455:Peptides / Q000138:chemical synthesis* / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods; D013194:Staining and Labeling; D013997:Time Factors
chemical_list: D050091:Dendrimers; D005456:Fluorescent Dyes; D006001:Glycoconjugates; D010455:Peptides