NMR spectroscopy, molecular dynamics, and conformation of a synthetic octasaccharide fragment of the O-specific polysaccharide of Shigella dysenteriae type 1

Bruce Coxon, Nese Sari, Gyula Batta, Vince Pozsgay

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12 Citations (Scopus)

Abstract

A synthetic octasaccharide fragment (2) of the O-specific polysaccharide (1) of Shigella dysenteriae type 1 has been studied as its methyl glycoside by one- and two-dimensional homo- and heteronuclear NMR spectroscopy. Complete 1H and 13C NMR assignments have been generated, and the 13C spin-lattice relaxation times have been measured for the octasaccharide 2. A congener (6) of this octasaccharide containing one D-galactose residue with a specific 13C label at C-1 has been synthesized and used to measure interglycosidic 13C-1H coupling by the 2D J-resolved 1H NMR method. From the NMR data, three types of conformational restraints were developed: (a) 29 inter-residue, distance restraints; (b) 48 intra-residue, ring atom dihedral angle restraints, and (c) one heteronuclear, inter-residue dihedral angle restraint. The use of these restraints in a restrained molecular dynamics computation with simulated annealing yielded a conformation resembling a short, irregular spiral, with methyl substituents on the exterior. Copyright (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)53-65
Number of pages13
JournalCarbohydrate Research
Volume324
Issue number1
DOIs
Publication statusPublished - Jan 29 2000

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Keywords

  • C-Labeling
  • Conformation
  • NMR spectroscopy
  • Octasaccharide
  • Restrained molecular dynamics
  • Shigella dysenteriae type 1
  • Simulated annealing
  • T-ROESY
  • TOCSY

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

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