Taxonomic group: plant / Streptophyta
(Phylum: Streptophyta)
Organ / tissue: gum
The structure was elucidated in this paperJournal NLM ID: 0372705Publisher: National Research Council of Canada Canada
Reduction of uronic acid residues in permethylated polysaccharides from Sterculiaurens and S. caudata gums, followed by transformation of the resulting hexose into 6-deoxy-6-iodohexose residues, affords modified polysaccharides that undergo depolymerization on treatment with zinc dust. The main products after reduction with sodium borohydride are hexenitolterminated oligosaccharides. Their structures have been assigned as members of a series of O-[α-L-rhamnopyranosyl]-(1 → 3)-1,2-dideoxyhex-1-enitol derivatives, with and without attendant β-D-galactopyranosyl substituents, on the basis of nuclear magnetic resonance and mass spectral data and compositional analysis of trideuteriomethylated derivatives. The structures of the polysaccharides have been reassessed in the light of these and other experiments, and may now be formulated as containing a backbone of alternating 4-linked α-D-galacturonic acid and 2-linked α-L-rhamnopyranose residues bearing a minimum of three types of side chains attached at specific sites. Characterization of some of the degradation products provides evidence that limited degradation had occurred during methylation of the glycuronans.
Structure type: polymer chemical repeating unit
Location inside paper: Fig. 8
Contained glycoepitopes: IEDB_115136,IEDB_116885,IEDB_136044,IEDB_136105,IEDB_137472,IEDB_140630,IEDB_141794,IEDB_190606,IEDB_225177,IEDB_423153,IEDB_885823,SB_165,SB_166,SB_187,SB_195,SB_7,SB_88
Methods: 1H NMR, Smith degradation, lithium degradation, iodination, zinc degradation
NCBI Taxonomy refs (TaxIDs): 482950,
66667Reference(s) to other database(s): CCSD:
14828, CBank-STR:17415
Show glycosyltransferases
There is only one chemically distinct structure:
Found 
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