Journal
CARBOHYDRATE RESEARCH
Volume 338, Issue 7, Pages 651-671Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0008-6215(03)00003-X
Keywords
rhamnogalacturonan II; conformation analysis; molecular modeling; NMR spectroscopy
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In this study, we describe the first optimized molecular models of the mega-oligosaccharide rhamnogalaturonan II, that is found in the primary cell walls of all higher plants. The 750 MHz H-1 NMR data previously reported and new heteronuclear correlation spectra (sensitivity-enhanced HSQC and HSQC-TOCSY) were first reassigned in light of the modifications in the primary structure. In turn, the experimental NMR data revealed the presence of an additional sugar, alpha-Araf (E-chain), and also the disaccharidic repeating unit of RG-I another component of the pectic matrix. Due to a fuller picture of the primary structure of RG-II, a much more complete assignment of the NOE data has been achieved. A systematic computational study based on these NOEs lead us to a realistic three-dimensional description of the RG-II, in excellent agreement with the molecular dimensions obtained from various experimental methods. (C) 2003 Elsevier Science Ltd. All rights reserved.
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