Abstract
Rathayibacter sp. VKM Ac-2759 (family Microbacteriaceae, class Actinobacteria) contains two glycopolymers in the cell wall. The main chain of rhamnan, glycopolymer 1, is built from the repeating tetrasaccharide units carrying terminal arabinofuranose residues at the non-reducing end, →3)-α-[α-D-Araf-(1→2)]-D-Rhap-(1→2)-α-D-Rhap-(1→3)-α-D-Rhap-(1→2)-α-D-Rhap-(1→. Similar to other described Rathayibacter species, rhamnose in the neutral glycopolymer of the VKM Ac-2759 strain is present in the D-configuration. Acetalated with pyruvic acid teichuronic acid, glycopolymer 2, is composed of the repeating tetrasaccharide units, →4)-β-D-GlcpA-(1→4)-β-D-Galp-(1→4)-β-D-Glcp-(1→3)-β-[4,6-S-Pyr]-D-Manp-(1→. Glycopolymers 1 and 2 were identified in prokaryotic microorganisms for the first time and their structures were established by chemical analysis and NMR spectroscopy. The obtained data can be used in taxonomic research, as well as for elucidating the mechanisms of plant colonization and infection by bacteria of the Rathayibacter genus.
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Abbreviations
- δC and δH :
-
chemical shifts of 13C and 1H atoms, respectively
- COSY:
-
correlation spectroscopy
- HMBC:
-
heteronuclear multiple bond correlation between 1H and 13C
- HSQC:
-
heteronuclear single quantum correlation
- J :
-
coupling constant
- ROESY:
-
rotating-frame nuclear Overhauser enhancement spectroscopy
- TOCSY:
-
total correlation spectroscopy
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Acknowledgments
The authors are grateful to Galina Matveevna Streshinskaya for help in our work and discussion of results.
Funding
This work was financially supported by the program CITIS: AAAA-A16-116021660068-1 of the Department of Microbiology of the Lomonosov Moscow State University for 2016-2022.
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The authors declare no conflict of interest in financial or any other sphere. This article does not contain any studies with human participants or animals performed by any of the authors.
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Published in Russian in Biokhimiya, 2021, Vol. 86, No. 4, pp. 595-606, https://doi.org/10.31857/S0320972521040114.
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Shashkov, A.S., Tul’skaya, E.M., Potekhina, N.V. et al. D-Rhamnan and Pyruvate-Containing Teichuronic Acid from the Cell Wall of Rathayibacter sp. VKM Ac-2759. Biochemistry Moscow 86, 506–516 (2021). https://doi.org/10.1134/S0006297921040118
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DOI: https://doi.org/10.1134/S0006297921040118