An O-polysaccharide (O-antigen) was isolated by mild acid degradation of the lipopolysaccharide of Providencia alcalifaciens O60 and studied by sugar and methylation analyses as well as (1)H and (13)C NMR spectroscopy, including 2D ROESY and (1)H, (13)C HMBC experiments in D(2)O and a ROESY experiment in a 9:1 H(2)O-D(2)O mixture to reveal correlations for NH protons. It was found that the polysaccharide is built up of linear pentasaccharide repeating units containing an amide of o-glucuronic acid with L-serine and has the following structure: -> 4)-beta-D-Glcp-(1 -> 3)-alpha-D-Galp-(1 -> 4)-beta-D-GalpNAc-(1 -> 4)-beta-D-GlepA-(1 -> 3)-beta-D-GalpNAc-(1 -> L-Ser-(2-6) The O-antigen studied is structurally and serologically closely related to the O-antigen of Proteus vulgaris O44. (c) 2010 Elsevier Ltd. All rights reserved.
机构:
CSIR, Cent Drug Res Inst, Med & Proc Chem Div, Lucknow 226031, Uttar Pradesh, India
Acad Sci & Innovat Res, New Delhi 110001, IndiaCSIR, Cent Drug Res Inst, Med & Proc Chem Div, Lucknow 226031, Uttar Pradesh, India
Mandal, Pintu Kumar
Chheda, Pratik Rajesh
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CSIR, Cent Drug Res Inst, Med & Proc Chem Div, Lucknow 226031, Uttar Pradesh, IndiaCSIR, Cent Drug Res Inst, Med & Proc Chem Div, Lucknow 226031, Uttar Pradesh, India