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A capsular polysaccharide (CPS) was isolated from strain MAR13-1452 of an emerging pathogen Acinetobacter baumannii and assigned type K125. The following structure of the CPS was established by sugar analysis, Smith degradation, and 1D and 2D 1H and 13C NMR spectroscopy: Proteins encoded by the KL125 gene cluster in the genome of MAR13-1452, including three glycosyltransferases, were assigned roles in the biosynthesis of the K125 CPS.

Acinetobacter baumannii, capsular polysaccharide, gene cluster, bacterial polysaccharide structure, capsule biosynthesis

NCBI PubMed ID: 29886169
Publication DOI: 10.1016/j.ijbiomac.2018.06.029
Journal NLM ID: 7909578
Publisher: Butterworth-Heinemann
Correspondence: yknirel@gmail.com
Institutions: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, M. M. Shemyakin & Y. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia, State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region, Russia, Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia, Institute of Antimicrobial Chemotherapy, Smolensk State Medical University, Smolensk, Russia, Central Scientific Research Institute of Epidemiology, Moscow, Russia
Methods: 13C NMR, 1H NMR, NMR-2D, DNA sequencing, sugar analysis, acid hydrolysis, GLC, Smith degradation, mild alkaline degradation, GPC, bioinformatic analysis, function analysis of gene clusters

Bacterial extracellular polysaccharides are known as a cell-bound capsule, a sheath, or a slime, which is excreted into the environment. They play an important role in virulence of medical bacteria and plant-to-symbiont interaction and are used for serotyping of bacteria and production of vaccines. Some exopolysaccharides have commercial applications in industry, and claims of health benefits have been documented for an increasing number of them. Exopolysaccharides have diverse composition and structure, and some contain sugar and non-sugar components that are found in bacterial carbohydrates only. The present article provides an updated collection of the data on exopolysaccharides of various classes of gram-negative and gram-positive bacteria reported until the end of 2019. When known, biosynthesis pathways of exopolysaccharides are treated in a summary manner. References are made to structure and biosynthesis relatedness between exopolysaccharides of different bacterial taxa as well as between bacterial polysaccharides and mammalian glycosaminoglycans.

polysaccharide structure, Gram-negative bacteria, capsule, Biofilm, polysaccharide biosynthesis, gram-positive bacteria, Monosaccharide composition, Bacterial exopolysaccharide, non-sugar component

Publication DOI: 10.1016/B978-0-12-819475-1.00005-5
Publisher: Elsevier
Correspondence: marie-rose.vancalsteren@canada.ca; yknirel@gmail.com
Editors: Barchi J, Kamerling H
Institutions: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, Saint-Hyacinthe Research and Development Centre, Agriculture and Agri-Food Canada, Saint-Hyacinthe, QC, Canada

Bacteriophage show promise for the treatment of Acinetobacter baumannii infections that resist all therapeutically suitable antibiotics. Many tail-spike depolymerases encoded by phage that are able to degrade A. baumannii capsular polysaccharide (CPS) exhibit specificity for the linkage present between K-units that make up CPS polymers. This linkage is formed by a specific Wzy polymerase, and the ability to predict this linkage using sequence-based methods that identify the Wzy at the K locus could assist with the selection of phage for therapy. However, little is known about the specificity of Wzy polymerase enzymes. Here, we describe a Wzy polymerase that can accommodate two different but similar sugars as one of the residues it links and phage depolymerases that can cleave both types of bond that Wzy forms.

Acinetobacter baumannii, capsular polysaccharide, Wzy polymerase, phage depolymerase, K70

NCBI PubMed ID: 37975684
Publication DOI: 10.1128/spectrum.03025-23
Journal NLM ID: 101634614
Publisher: Washington, DC: ASM Press
Correspondence: J.J. Kenyon
Institutions: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region, Russia, M. M. Shemyakin and Y. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia, Centre for Immunology and Infection Control, School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Australia, School of Life and Environmental Sciences, Faculty of Science, University of Sydney, Sydney, Australia, Saw Swee Hock School of Public Health, National University of Singapore, Queenstown, Singapore, Yong Loo Lin School of Medicine, National University of Singapore, Queenstown, Singapore
Methods: 13C NMR, 1H NMR, NMR-2D, DNA sequencing, sugar analysis, DNA techniques, GLC, Smith degradation, HPLC, GPC, bioinformatic analysis, phage depolymerisation, HR-ESI-MS