The structure of the cyclic enterobacterial common antigen (ECA) from Yersinia pestis.
Carbohydr Res
; 258: 223-32, 1994 May 20.
Article
en En
| MEDLINE
| ID: mdl-8039177
ABSTRACT
Two antigenic acidic polysaccharides related to enterobacterial common antigen (ECA) were isolated from a vaccine strain of a pathogenic microorganism Yersinia pestis. The low molecular weight polysaccharide (LMP) is composed of equal amounts of 2-acetamido-2-deoxy-D-mannuronic acid, 4-acetamido-4,6-dideoxy-D-galactose (Fuc4NAc), and 2-amino-2-deoxy-D-glucose which is partially N- and partially 6-O-acetylated. The structure of the trisaccharide repeating unit was established by analyses of LMP and the completely N-acetylated LMP (LMP-NAc) using 1H and 13C NMR spectroscopy, including 2D COSY and 1D NOE spectroscopy. Deamination of LMP with nitrous acid gave a set of oligomers terminated with 2,5-anhydromannose and ranging from tri- to dodeca-saccharides, thus indicating a random distribution of free amino groups. FABMS analyses of LMP and LMP-NAc showed that LMP consists mainly of the cyclic tetramer of the trisaccharide repeating unit together with a small amount of the cyclic trimer and a very small amount of the cyclic pentamer and has, thus, the following structure [formula see text] where R is Ac or H (approximately 11), R' is Ac or H (approximately 14), and n = 4 (major), 3, 5 (minor). Small proportions of the linear trimer and the linear tetramer were also detected in the preparations. The high molecular weight polysaccharide is linear and has the same (or a very similar) repeating unit as LMP.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Polisacáridos Bacterianos
/
Yersinia pestis
/
Antígenos Bacterianos
Idioma:
En
Revista:
Carbohydr Res
Año:
1994
Tipo del documento:
Article