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NanoBiotechnology

, Volume 1, Issue 2, pp 191–199 | Cite as

A designed glycopeptide array for characterization of sugar-binding proteins toward a glycopeptide chip technology

  • Kenj Usui
  • Tetsunori Jong
  • Kin-ya Toioki
  • Hisakan Mihara
Original Article

Abstract

For the realization of a practical high-throughput protein detection and analysis system, a novel peptide array has been constructed using a designed glycopeptide model library with an α-helical secondary structure. This study will contribute the increment of the diversity of such an array system and the application to focused proteomics and ligand screening by effective detection of sugar-binding proteins. Fluorescent glycopeptides with an α-helix, a β-strand, or a loop structure were designed initially to select a suitable scaffold for the detection of a model protein. After selection of the α-helical structure as the best scaffold, a small model library with various saccharides was constructed to have charge and hydrophobicity variations in the peptide sequences. When various sugar-binding proteins were added to the peptide library array, the fluorescent peptides showed different responses in fluorescence intensities depending on their sequences as well as saccharides. The patterns of these responses could be regarded as “protein fingerprints” (PFPs), which are able to establish the identities of the target proteins. The resulting PFPs reflected the recognition properties of the proteins. Furthermore, statistical data analysis from obtained PFPs was performed using a cluster analysis. The PFPs of sugar-binding proteins were clustered successfully depending on their families and binding properties. These studies demonstrate that arrays with glycopeptide libraries based on designed structures can be promising tools to detect and analyze the target proteins. Designed peptides with functional groups such as sugars will play roles as the capturing agents of high-throughput protein nano/micro arrays for focused proteomics and ligand screening studies.

Key Words

Focused proteome glycosidase α-helix lectin microarray peptide protein chip sugar 

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Copyright information

© Humana Press Inc 2005

Authors and Affiliations

  • Kenj Usui
    • 1
  • Tetsunori Jong
    • 1
  • Kin-ya Toioki
    • 1
  • Hisakan Mihara
    • 1
  1. 1.Department of Bioengineering and the COE21 program, Graduate School of Bioscience and BiotechnologyTokyo Institute of TechnologyYokohamaJapan

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