Enterotoxigenic Escherichia coli are causative agents of diarrhea in humans as well as animals, and E. coli O170 belongs to this virotype. Upon mild acid degradation of the lipopolysaccharide of E. coli O170, the branched O-polysaccharide chain was partially cleaved at beta-D-glactofuranosidic linkages to give multiple products, including a linear tetrasaccharide and oligomers thereof. Studies of the acid degradation products and O-deacylated lipopolysaccharide by 1D and 2D H-1 and C-13 NMR spectroscopy enabled elucidation of the following O-polysaccharide structure: -> 4)-beta-D-GlcpNAc-(1 -> 4)-beta-D-GlcpA-(1 -> 3)-beta-D-Galf-(1 -> 3)-beta-D-GlcNAc-(1 -> [GRAPHICS] beta-D-Galf Functions of genes in the O-antigen biosynthesis gene cluster were tentatively assigned and found to be in agreement with the O-polysaccharide structure. (C) 2015 Elsevier Ltd. All rights reserved.
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Zigong Ctr Dis Control & Prevent, Zigong, Peoples R ChinaZigong Ctr Dis Control & Prevent, Zigong, Peoples R China
Wang, Hong
Zheng, Han
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Zheng, Han
Li, Qun
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Du, Pengcheng
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Capital Med Univ, Beijing Ditan Hosp, Inst Infect Dis, Beijing Key Lab Emerging Infect Dis, Beijing, Peoples R ChinaZigong Ctr Dis Control & Prevent, Zigong, Peoples R China
Du, Pengcheng
Li, Xinqiong
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