Conformational analysis of a flexible oligosaccharide using residual dipolar couplings.

Published

Journal Article

We present a new approach to the analysis of the conformational and the motional properties of an oligosaccharide, methyl 3,6-di-O-(alpha-D-mannopyranosyl)-alpha-D-mannopyranoside. The approach relies on an order matrix analysis of residual dipolar couplings in the solution state. By combining a number of different types of couplings, (1)D(CH), (2)D(CH), and D(HH), an order matrix is solved for each ring of the trimannoside. The resulting order parameters indicate the internal motion at the alpha (1,3) linkage to be limited, while significant motion is suggested at the alpha (1,6) linkage. Two structures for the trimannoside were determined by aligning the order tensor principal axes obtained from two different orienting media, bicelles and phage. The very similar conformations at the alpha (1,3) linkage of these two structures confirm that the internal motion at the alpha (1,3) linkage is small and the conformation is a good representation of a single preferred structure. The different conformations at the alpha (1,6) linkage suggest that the motional amplitudes are large and the conformations must be viewed as virtual conformers. Compared with traditional NMR methods, data acquisition is easy and data analysis is straightforward.

Full Text

Duke Authors

Cited Authors

  • Tian, F; Al-Hashimi, HM; Craighead, JL; Prestegard, JH

Published Date

  • January 24, 2001

Published In

Volume / Issue

  • 123 / 3

Start / End Page

  • 485 - 492

PubMed ID

  • 11456551

Pubmed Central ID

  • 11456551

International Standard Serial Number (ISSN)

  • 0002-7863

Digital Object Identifier (DOI)

  • 10.1021/ja002900l

Language

  • eng

Conference Location

  • United States