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Viskov, Christian; Elli, Stefano; Urso, Elena; Gaudesi, Davide; Mourier, Pierre; Herman, Frederic; Boudier, Christian; Casu, Benito; Torri, Giangiacomo; Guerrini, Marco
The Journal of biological chemistry, 09/2013, Volume: 288, Issue: 36Journal Article
The antithrombin (AT) binding properties of heparin and low molecular weight heparins are strongly associated to the presence of the pentasaccharide sequence AGA*IA (A(NAc,6S)-GlcUA-A(NS,3,6S)-I(2S)-A(NS,6S)). By using the highly chemoselective depolymerization to prepare new ultra low molecular weight heparin and coupling it with the original separation techniques, it was possible to isolate a polysaccharide with a biosynthetically unexpected structure and excellent antithrombotic properties. It consisted of a dodecasaccharide containing an unsaturated uronate unit at the nonreducing end and two contiguous AT-binding sequences separated by a nonsulfated iduronate residue. This novel oligosaccharide was characterized by NMR spectroscopy, and its binding with AT was determined by fluorescence titration, NMR, and LC-MS. The dodecasaccharide displayed a significantly increased anti-FXa activity compared with those of the pentasaccharide, fondaparinux, and low molecular weight heparin enoxaparin.
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