Abstract
The relative proportion of L-iduronic acid (IdoA) and D-glucuronic acid (GlcA) is of great importance for the structure–function relationship of chondroitin sulfate (CS)/dermatan sulfate (DS). However, determination of the isotypes of uronic acid residues in CS/DS is still a challenge, due to the instability of free uronic acid released by chemical degradation and its conversion to unsaturated uronic acid by digestion with bacterial eliminase. 1H-Nuclear magnetic resonance (NMR) spectroscopy is a promising tool with which to address this issue, but the traditional method based on the assignment of the ring proton signals of IdoA and GlcA residues still has drawbacks such as the serious overlap of signals in the 1H-NMR spectrum of CS/DS polysaccharides. We found that the proton signals of the N-acetyl group of N-acetyl-D-galactosamines in CS and DS could be clearly distinguished and accurately integrated in the one-dimensional (1D) 1H-NMR spectrum. Based on this finding, here we report a novel, sensitive, and nondestructive 1D 1H-NMR-based method to determine the proportion of IdoA and GlcA residues in CS/DS hybrid chains.
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Abbreviations
- 1D:
-
one-dimensional
- CSase:
-
chondroitinase
- CS:
-
chondroitin sulfate
- DS:
-
dermatan sulfate
- GalNAc:
-
N-acetyl-D-galactosamine
- GlcA:
-
D-glucuronic acid
- IdoA:
-
L-iduronic acid
- ΔHexA:
-
4-deoxy-L-threo-hex-4-enepyranosyluronic acid
- HPLC:
-
high performance liquid chromatography
- NMR:
-
nuclear magnetic resonance
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Acknowledgements
The authors thank X. Bao for the preparation of E-CS/DS. This work was supported by HAITEKU (2004–2008) from the Japan Private School Promotion Foundation, Grant-in-aid for Scientific Research C-19590052 (to S. Y.) and Scientific Research (B) 18390030 (to K. S.) from MEXT (Ministry of Education, Culture, Sports, Science and Technology, Japan), The Human Frontier Science Program RGP0018/2005 (to K. S.), the Core Research for Evolutional Science and Technology (CREST) of the Japan Science and Technology (JST) agency (to K. S.), and a National Project “Knowledge Cluster Initiative” (2nd stage “Sapporo Bio-cluster Bio-S”) from MEXT.
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The contributions of Fuchuan Li and Shuhei Yamada should be considered equal.
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Li, F., Yamada, S., Basappa et al. Determination of iduronic acid and glucuronic acid in sulfated chondroitin/dermatan hybrid chains by 1H-nuclear magnetic resonance spectroscopy. Glycoconj J 25, 603–610 (2008). https://doi.org/10.1007/s10719-008-9124-x
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DOI: https://doi.org/10.1007/s10719-008-9124-x