Structure of the O-polysaccharide of Providencia alcalifaciens O8 containing (2S,4R)-2,4-dihydroxypentanoic acid, a new non-sugar component of bacterial glycans.
A glycerol teichoic acid-like O-polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O8 and studied by chemical methods and NMR spectroscopy, including 2D ROESY, {(1)H,(13)C} HSQC, and HMQC-TOCSY experiments. It was found that the compound contains a new component of bacterial lipopolysaccharides: ether-linked (2S,4R)-2,4-dihydroxypentanoic acid (Dhpa), which was identified by NMR spectroscopy. The following structure of the repeating unit of the polysaccharide was established: [structure: see text]
Toukach
Filip V
FV
Russian Academy of Sciences, 119991 Moscow, Russia. never@vilvit.net
Kocharova
Nina A
NA
Maszewska
Agnieszka
A
Shashkov
Alexander S
AS
Knirel
Yuriy A
YA
Rozalski
Antoni
A