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Self‐Organized Glycoclusters Along DNA: Effect of the Spatial Arrangement of Galactoside Residues on Cooperative Lectin Recognition
Author(s) -
Matsuura Kazunori,
Hibino Miki,
Ikeda Takayasu,
Yamada Yoshinao,
Kobayashi Kazukiyo
Publication year - 2004
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200305465
Subject(s) - lectin , galactose , chemistry , c type lectin , size exclusion chromatography , concanavalin a , biochemistry , enzyme , in vitro
We describe herein the relationship between the spatial arrangement of self‐organized galactose clusters and lectin recognition. β‐Galactose‐modified deoxyuridine phosphoramidite was synthesized and applied to solid‐phase synthesis to provide 18‐, 20‐, and 22‐mers of site‐specifically galactosylated oligodeoxynucleotides (Gal‐ODNs). These Gal‐ODNs were self‐organized through hybridization with the corresponding 18‐, 20‐, and 22‐mers of half‐sliding complementary ODNs (hsc‐ODNs) to give periodic galactoside clusters. The self‐organization of ODNs was confirmed by size exclusion chromatography and gel electrophoresis. The binding of the Gal‐clusters to the FITC‐labeled RCA 120 lectin was analyzed by monitoring the change in fluorescence intensity. The assembly of 20‐mer Gal‐ODN with the 20‐mer hsc‐ODN was strongly and cooperatively recognized by the lectin. The 18‐mer assembly was bound more weakly and less cooperatively, and the 22‐mer assembly was minimally bound to the lectin. RCA 120 lectin recognized not only the density of galactoside residues, but also the spatial arrangement. The size of the Gal cluster was estimated from the association constant of Gal‐ODN with hsc‐ODN. The relationship between lectin‐recognition and Gal‐cluster size is also discussed.