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Arbatsky NP, Shashkov AS, Shneider MM, Mikhailova YV, Shelenkov AA, Sheck EA, Kasimova AA, Kalinchuk NA, Kenyon JJ, Knirel YA. The K129 capsular polysaccharide produced by Acinetobacter baumannii MAR 15-4076 has the same composition as K84 but differs in the linkage between units altering the overall branching topology. Carbohydr Res 2024; 545:109273. [PMID: 39326204 DOI: 10.1016/j.carres.2024.109273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2024] [Revised: 09/09/2024] [Accepted: 09/10/2024] [Indexed: 09/28/2024]
Abstract
Capsular polysaccharide (CPS) is a heteroglycan that coats the cell surface of most isolates of the important Gram-negative bacterial pathogen, Acinetobacter baumannii. Strain MAR 15-4076, a clinical isolate recovered in Russia in 2015, was found to carry the KL129 sequence at the CPS biosynthesis K locus. The CPS was isolated from the strain and studied by sugar analysis, Smith degradation, one- and two-dimensional 1H and 13C NMR spectroscopy. It was composed of branched pentasaccharide units that include a →3)-α-l-Rhap-(1 → 3)-α-l-Rhap-(1 → 3)-β-d-GlcpNAc-(1→ mainchain and α-d-ManpNAc-(1 → 3)-l-Rhap side branch. Though the pentasaccharide units are identical to those that make up the K84 CPS produced by A. baumannii LUH5540, the units are linked differently via the substitution of an alternate l-Rhap residue, resulting in a difference in the overall topology of the CPS. This was due to the replacement of the Wzy polymerase gene encoded at the K locus.
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Affiliation(s)
- Nikolay P Arbatsky
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia.
| | - Alexander S Shashkov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Mikhail M Shneider
- M. M. Shemyakin & Y. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | | | | | - Eugene A Sheck
- Institute of Antimicrobial Chemotherapy (IAC), Smolensk State Medical University, Smolensk, Russia
| | - Anastasia A Kasimova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Nadezhda A Kalinchuk
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Johanna J Kenyon
- School of Pharmacy and Medical Sciences, Health Group, Griffith University, Gold Coast Campus, Southport, Australia; Institute for Biomedicine and Glycomics, Griffith University, Gold Coast Campus, Southport, Australia.
| | - Yuriy A Knirel
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
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Kasimova AA, Kolganova AS, Shashkov AS, Shneider MM, Mikhailova YV, Shelenkov AA, Popova AV, Knirel YA, Perepelov AV, Kenyon JJ. Structure of the K141 capsular polysaccharide produced by Acinetobacter baumannii isolate KZ1106 that carries KL141 at the chromosomal K locus. Carbohydr Res 2024; 538:109097. [PMID: 38555658 DOI: 10.1016/j.carres.2024.109097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 03/17/2024] [Accepted: 03/19/2024] [Indexed: 04/02/2024]
Abstract
The structure of the K141 type capsular polysaccharide (CPS) produced by Acinetobacter baumannii KZ1106, a clinical isolate recovered from Kazakhstan in 2016, was established by sugar analyses and one- and two-dimensional 1H and 13C NMR spectroscopy. The CPS was shown to consist of branched tetrasaccharide repeating units (K-units) with the following structure: This structure was found to be consistent with the genetic content of the KL141 CPS biosynthesis gene cluster at the chromosomal K locus in the KZ1106 whole genome sequence. Assignment of the encoded enzymes allowed the first sugar of the K unit to be identified, which revealed that the β-d-GlcpNAc-(1→3)-d-GlcpNAc bond is the linkage between K-units formed by the WzyKL141 polymerase.
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Affiliation(s)
- Anastasiya A Kasimova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Anna S Kolganova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia; D. I. Mendeleev University of Chemical Technology of Russia, Moscow, Russia
| | - Alexander S Shashkov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Mikhail M Shneider
- M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 119997, Moscow, Russia
| | | | | | - Anastasiya V Popova
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region, Russia
| | - Yuriy A Knirel
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Andrey V Perepelov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Johanna J Kenyon
- School of Pharmacy and Medical Sciences, Health Group, Griffith University, Gold Coast, Australia; Centre for Immunology and Infection Control, School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Australia.
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Kasimova AA, Shashkov AS, Shneider MM, Sheck EA, Mikhailova YV, Shelenkov AA, Popova AV, Knirel YA, Kenyon JJ. The Acinetobacter baumannii K239 capsular polysaccharide includes heptasaccharide units that are structurally related to K86 but joined by different linkages formed by different Wzy polymerases. Int J Biol Macromol 2024; 262:130045. [PMID: 38336317 DOI: 10.1016/j.ijbiomac.2024.130045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 12/16/2023] [Accepted: 02/06/2024] [Indexed: 02/12/2024]
Abstract
The K239 type capsular polysaccharide (CPS) isolated from Acinetobacter baumannii isolate MAR19-4435 was studied by sugar analysis, one- and two-dimensional 1H and 13C NMR spectroscopy. K239 consists of branched heptasaccharide repeats (K-units) comprised of five residues of l-rhamnose (l-Rhap), and one residue each of d-glucuronic acid (d-GlcpA) and N-acetyl-d-glucosamine (d-GlcpNAc). The structure of K239 is closely related to that of the A. baumannii K86 CPS type, though the two differ in the 2,3-substitution patterns on the l-Rhap residue that is involved in the linkage between K-units in the CPS polymer. This structural difference was attributed to the presence of a gtr221 glycosyltransferase gene and a wzyKL239 polymerase gene in KL239 that replaces the gtr80 and wzyKL86 genes in the KL86 CPS biosynthesis gene cluster. Comparison of the two structures established the role of a novel WzyKL239 polymerase encoded by KL239 that forms the β-d-GlcpNAc-(1→2)-l-Rhap linkage between K239 units. A. baumannii MAR19-4435 was found to be non-susceptible to infection by the APK86 bacteriophage, which encodes a depolymerase that specifically cleaves the linkage between K-units in the K86 CPS, indicating that the difference in 2,3-substitution of l-Rhap influences the susceptibility of this isolate to bacteriophage activity.
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Affiliation(s)
- Anastasiya A Kasimova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Alexander S Shashkov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Mikhail M Shneider
- M. M. Shemyakin and Y. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 119997 Moscow, Russia
| | - Eugenii A Sheck
- Institute of Antimicrobial Chemotherapy (IAC), Smolensk State Medical University (SSMU), Kirova St. 46a, Smolensk 214019, Russia
| | | | | | - Anastasiya V Popova
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region, Russia
| | - Yuriy A Knirel
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Johanna J Kenyon
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Australia.
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