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Cyclophane-lectin Conjugates as a New Class of Water-soluble Host

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Abstract

A conjugate composed of tetraaza[6.1.6.1]paracyclophane bearing carboxylic acids and lectin, a carbohydrate binding protein, was prepared. The specific saccharide-binding abilities as well as the secondary structural features of the lectin were not disturbed, when the cyclophane were covalently bound to the lectin. The conjugate was found to act as a water-soluble host for inclusion of anionic guest molecules such as 6-p-toluidino-naphthalene-2-sulfonate (TNS) and 8-anilinonaphthalene-1-sulfonate (ANS) in aqueous acetate buffer (pH 4.0) with binding constants of 4.2 × 104 and 1.5 × 104 dm3 mol−1, respectively. The obtained binding constants were much larger than those by untethered water-soluble cyclophane. A highly desolvated microenvironment was provided by the cyclophane cavity on the protein surfaces so that the tight host–guest interaction, which brought about the marked motional repression of the entrapped guests, became effective. The conjugate also showed molecular discrimination capabilities toward the anionic guests through electrostatic repulsion mechanism originating from acid-dissociation equilibrium of carboxylic acids of the cyclophane branches.

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Authors and Affiliations

  1. Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, Hakozaki, Higashi-ku, 812-8581, Japan

    Osamu Hayashida & Itaru Hamachi

  2. PRESTO, JST, 4-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan

    Osamu Hayashida

Authors
  1. Osamu Hayashida
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  2. Itaru Hamachi
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Correspondence to Osamu Hayashida.

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Hayashida, O., Hamachi, I. Cyclophane-lectin Conjugates as a New Class of Water-soluble Host. J Incl Phenom Macrocycl Chem 53, 57–61 (2005). https://doi.org/10.1007/s10847-005-0993-3

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  • DOI: https://doi.org/10.1007/s10847-005-0993-3

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