Langhorn LM, Wang B, Meldal M, Bols M. Attachment of cyclodextrin acids to PEGA resin and study of binding with fluorescence microscopy.
Bioorg Med Chem Lett 2021;
43:128060. [PMID:
33895279 DOI:
10.1016/j.bmcl.2021.128060]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 04/12/2021] [Accepted: 04/19/2021] [Indexed: 11/26/2022]
Abstract
Three different cyclodextrin acids, 6A,6D-di-O-(prop-2-carboxy-1,3-dienyl)-α-cyclodextrin (1), 6-deoxy-β-cyclodextrin-6-carboxylic acid (2), 6-deoxy-β-cyclodextrin-6-ethylenecarboxylic acid (3), were prepared and attached to amino PEGA resin as amides using coupling conditions with COMU and NEM. Host-guest binding to the resins was studied by fluorescence microscopy using 8-anilinoaphtalene-1-sulfonic acid (ANS) as guest, and was found to follow the equation IF = IFmax*[ANS]/([ANS] + Kd) where F, Fmax and Kd are the fluorescence, maximum fluorescence and Kd the dissociation constant for the ANS-cyclodextrin complex, respectively. Kd was 4.4, 2.4 and 4.9 × 10-4 M for the three resins. Competitive inhibition of ANS binding was performed with 1-adamantanylamine and octyl β-d-glucoside with the latter being selective for the α-cyclodextrin as expected.
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