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1. (Article ID: 1550)
 
Ovchinnikova OG, Kocharova NA, Torzewska A, Blaszczyk A, Shashkov AS, Knirel YA, Rozalski A
The structure of the O-polysaccharide from the lipopolysaccharide of Providencia stuartii O43 containing an amide of D-galacturonic acid with L-serine
Carbohydrate Research 340(7) (2005) 1407-1411
 

The O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Providencia stuartii O43:H28 and studied by sugar and methylation analyses, Smith degradation and 1H and 13C NMR spectroscopy, including 2D ROESY, and H-detected 1H, 13C HSQC and HMBC experiments, as well as a NOESY experiment in a 9:1 H2O/D2O mixture to reveal correlations for NH protons. It was found that the polysaccharide is built up of linear tetrasaccharide repeating units containing an amide of D-galacturonic acid with L-serine [D-GalA6(L-Ser)] and has the following structure:[3)-β-D-GalpA6(L-Ser)-(1→3)-β-D-GlcpNAc-(1→2)-α-D-Rhap4NAc-(1→4)-β-D-GlcpA-(1→]n.

Lipopolysaccharide, O-antigen, polysaccharide structure, Providencia stuartii, D-galacturonoyl-L-serine

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