The three-dimensional structure of the mega-oligosaccharide rhamnogalacturonan II monomer: a combined molecular modeling and NMR investigation.
Carbohydr Res
; 338(7): 651-71, 2003 Mar 28.
Article
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| MEDLINE
| ID: mdl-12644378
ABSTRACT
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 1H 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.
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Banco de datos:
MEDLINE
Asunto principal:
Modelos Moleculares
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Pectinas
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Resonancia Magnética Nuclear Biomolecular
Idioma:
En
Año:
2003
Tipo del documento:
Article