Abstract
A polysaccharide was isolated from the opportunistic human pathogen Providencia alcalifaciens O45:H26 by extraction with aqueous phenol and studied by sugar and methylation analyses along with 1H and 13C NMR spectroscopy, including two-dimensional ROESY and H-detected 1H,13C HSQC experiments. The polysaccharide contains N-acetylglu-cosamine and N-acetylmuramic acid (D-GlcpNAc3Rlac) amidated with L-alanine and has the following structure:
The polysaccharide possesses a remarkable structural similarity to the bacterial cell wall peptidoglycan. It is not unique to the strain studied but is common to strains of at least four P. alcalifaciens O-serogroups (O3, O24, O38, and O45). No evidence was obtained that the polysaccharide is associated with the LPS, and hence it might represent a bacterial capsule component.
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Abbreviations
- COSY:
-
correlation spectroscopy
- CPS:
-
capsular polysaccharide
- ESI MS:
-
electrospray ionization mass spectrometry
- GlcN:
-
glucosamine
- GlcNAc3Rlac:
-
N-acetylmuramic acid
- HSQC:
-
heteronuclear single-quantum coherence
- LPS:
-
lipopolysaccharide
- Rlac:
-
(R)-lactic acid or (R)-1-carboxyethyl group
- ROESY:
-
rotating-frame nuclear Overhauser effect spectroscopy
- TOCSY:
-
total correlation spectroscopy
- C14:0, C16:0, and C18:0, tetradecanoic, hexadecanoic:
-
and octadecanoic acid
- 3OH-C14:0:
-
3-hydroxytetradecanoic acid
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Published in Russian in Biokhimiya, 2012, Vol. 77, No. 6, pp. 750–757.
Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM12-030, March 25, 2012.
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Ovchinnikova, O.G., Liu, B., Kocharova, N.A. et al. Structure of a peptidoglycan-related polysaccharide from Providencia alcalifaciens O45. Biochemistry Moscow 77, 609–615 (2012). https://doi.org/10.1134/S0006297912060077
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DOI: https://doi.org/10.1134/S0006297912060077