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Structure of a peptidoglycan-related polysaccharide from Providencia alcalifaciens O45

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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:

$$\to 4) - \beta - D - GlcpNAc - (1 \to 4) - \beta - D - GlcpNAc3(Rlac - L - Ala) - (1 \to .$$

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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Correspondence to O. G. Ovchinnikova.

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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

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