TY - JOUR
T1 - Genetic organization and sequence of the rfb gene cluster of Yersinia enterocolitica serotype O:3
T2 - similarities to the dTDP‐L‐rhamnose biosynthesis pathway of Salmonella and to the bacterial polysaccharide transport systems
AU - Zhang, Lijuan
AU - Al-Hendy, Ayman
AU - Toivanen, Paavo
AU - Skumik, Mikael
PY - 1993/7
Y1 - 1993/7
N2 - The Yersinia enterocolitica O:3 lipopotysaccharide O‐antigen is a homopotymer of 6‐deoxy‐L‐altrose. The cloned rfb region was sequenced, and 10 open reading frames were identified. Transposon mutagenesis, deletion analysis and transcomplementatton experiments showed that eight of the genes, organized into two operons, rfbABC and rfbDEFGH, are essential for 0‐antigen synthesis. Functional tandem promoters were identified upstream of both operons. Of the deduced polypeptides RfbA, RfbF and RfbG were similar to Salmonella proteins involved in the dTDP‐l‐rhamnose biosynthesis. Rhamnose and 6‐deoxy‐l‐altrose are C3‐epimers suggesting that analogous pathways function in their biosynthesis. RfbD and RfbE were similar to capsular polysaccharide export proteins, e.g. KpsM and KpsT of Escherichia coli. This and transposon mutagenesis showed that RfbD and RfbE function as O‐antigen exporters.
AB - The Yersinia enterocolitica O:3 lipopotysaccharide O‐antigen is a homopotymer of 6‐deoxy‐L‐altrose. The cloned rfb region was sequenced, and 10 open reading frames were identified. Transposon mutagenesis, deletion analysis and transcomplementatton experiments showed that eight of the genes, organized into two operons, rfbABC and rfbDEFGH, are essential for 0‐antigen synthesis. Functional tandem promoters were identified upstream of both operons. Of the deduced polypeptides RfbA, RfbF and RfbG were similar to Salmonella proteins involved in the dTDP‐l‐rhamnose biosynthesis. Rhamnose and 6‐deoxy‐l‐altrose are C3‐epimers suggesting that analogous pathways function in their biosynthesis. RfbD and RfbE were similar to capsular polysaccharide export proteins, e.g. KpsM and KpsT of Escherichia coli. This and transposon mutagenesis showed that RfbD and RfbE function as O‐antigen exporters.
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U2 - 10.1111/j.1365-2958.1993.tb01692.x
DO - 10.1111/j.1365-2958.1993.tb01692.x
M3 - Article
C2 - 7692217
AN - SCOPUS:0027281825
SN - 0950-382X
VL - 9
SP - 309
EP - 321
JO - Molecular Microbiology
JF - Molecular Microbiology
IS - 2
ER -