Taxonomic group: bacteria / Proteobacteria
(Phylum: Proteobacteria)
Associated disease: infection due to Acinetobacter baumannii [ICD11:
XN8LS 
]
The structure was elucidated in this paperNCBI PubMed ID: 26406455Publication DOI: 10.1016/j.carres.2015.09.002Journal NLM ID: 0043535Publisher: Elsevier
Correspondence: C. De Castro <decastro
unina.it>
Institutions: School of Molecular Bioscience, The University of Sydney, Sydney, NSW, 2006, Australia, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, 4001, Australia, Department of Agriculture, via Universita 100, Portici, NA, Italy
The structure of the capsular polysaccharide (CPS) recovered from D46, an extensively antibiotic resistant ST25 Acinetobacter baumannii clinical isolate, was elucidated. The structure was resolved on the basis of NMR spectroscopy and chemical analyses, and was found to contain a branched neutral pentasaccharide with a backbone composed of GalpNAc and Galp residues, all d configured, and a d-Glcp side group. The KL14 gene cluster found in the D46 genome includes genes for four glycosyltransferases but no modules for synthesis of complex sugars, and this is consistent with the structure of K14. The K14 structure and KL14 sequence clarify the relationship between the structure and K locus sequence for A. nosocomialis isolate LUH5541. The identity of the first sugar of the K14 repeat unit (K unit), and the functions of the four encoded glycosyltransferases and Wzy polymerase were predicted.
Acinetobacter baumannii, capsular polysaccharide, capsule, K locus, KL14 gene cluster
Structure type: polymer chemical repeating unit
Location inside paper: p.53, fig.2
Compound class: CPS, O-polysaccharide, O-antigen
Contained glycoepitopes: IEDB_130648,IEDB_134624,IEDB_134627,IEDB_136044,IEDB_136906,IEDB_137472,IEDB_137473,IEDB_1391961,IEDB_1391963,IEDB_141584,IEDB_141794,IEDB_142488,IEDB_143260,IEDB_146664,IEDB_151528,IEDB_190606,IEDB_742248,IEDB_885822,IEDB_983931,SB_163,SB_165,SB_166,SB_187,SB_192,SB_195,SB_21,SB_23,SB_24,SB_7,SB_8,SB_88
Methods: 13C NMR, 1H NMR, methylation, NMR-2D, GC-MS, sugar analysis, extraction, acetylation, bioinformatic analysis, dialysis
Enzymes that release or process the structure: Gtr32, Gtr33, Gtr25, Gtr5f, Wzy(K14)[ItrA2]
Biosynthesis and genetic data: genetic data
NCBI Taxonomy refs (TaxIDs): 470Reference(s) to other database(s): GTC:G69238MT, GlycomeDB:
25206
Show glycosyltransferases
NMR conditions: in D2O at 296 K
[as TSV]
13C NMR data:
Linkage Residue C1 C2 C3 C4 C5 C6
3,6,3,2 Ac
3,6,3,6 bDGlcp 104.1 74.2 76.8 70.5 77.1 61.6
3,6,3 bDGalpN 104.5 53.8 71.4 77.1 73.4 69.1
3,6 aDGalp 100.2 68.5 80.5 70.4 71.8 62.2
3 bDGalp 105.7 71.6 73.7 69.7 74.8 67.3
2 Ac
aDGalpN 99.8 49.8 78.7 69.2 71.4 61.6
1H NMR data:
Linkage Residue H1 H2 H3 H4 H5 H6
3,6,3,2 Ac - 2.05
3,6,3,6 bDGlcp 4.42 3.28 3.47 3.40 3.40 3.74-3.91
3,6,3 bDGalpN 4.70 4.03 3.83 4.06 3.90 3.85-4.02
3,6 aDGalp 4.97 3.91 3.91 4.20 3.93 3.74-3.74
3 bDGalp 4.56 3.54 3.64 4.03 3.91 3.74-3.88
2 Ac - 2.05
aDGalpN 5.03 4.38 4.13 4.31 4.41 3.70-3.70
1H/13C HSQC data:
Linkage Residue C1/H1 C2/H2 C3/H3 C4/H4 C5/H5 C6/H6
3,6,3,2 Ac NMR TSV error 2: unequal length of 13C and 1H datasets
3,6,3,6 bDGlcp 104.1/4.42 74.2/3.28 76.8/3.47 70.5/3.40 77.1/3.40 61.6/3.74-3.91
3,6,3 bDGalpN 104.5/4.70 53.8/4.03 71.4/3.83 77.1/4.06 73.4/3.90 69.1/3.85-4.02
3,6 aDGalp 100.2/4.97 68.5/3.91 80.5/3.91 70.4/4.20 71.8/3.93 62.2/3.74-3.74
3 bDGalp 105.7/4.56 71.6/3.54 73.7/3.64 69.7/4.03 74.8/3.91 67.3/3.74-3.88
2 Ac NMR TSV error 2: unequal length of 13C and 1H datasets
aDGalpN 99.8/5.03 49.8/4.38 78.7/4.13 69.2/4.31 71.4/4.41 61.6/3.70-3.70
1H NMR data:
| Linkage | Residue | H1 | H2 | H3 | H4 | H5 | H6 |
|---|
| 3,6,3,2 | Ac |
| 2.05 | |
| 3,6,3,6 | bDGlcp | 4.42 | 3.28 | 3.47 | 3.40 | 3.40 | 3.74
3.91 |
| 3,6,3 | bDGalpN | 4.70 | 4.03 | 3.83 | 4.06 | 3.90 | 3.85
4.02 |
| 3,6 | aDGalp | 4.97 | 3.91 | 3.91 | 4.20 | 3.93 | 3.74
3.74 |
| 3 | bDGalp | 4.56 | 3.54 | 3.64 | 4.03 | 3.91 | 3.74
3.88 |
| 2 | Ac |
| 2.05 | |
| | aDGalpN | 5.03 | 4.38 | 4.13 | 4.31 | 4.41 | 3.70
3.70 |
|
13C NMR data:
| Linkage | Residue | C1 | C2 | C3 | C4 | C5 | C6 |
|---|
| 3,6,3,2 | Ac | |
| 3,6,3,6 | bDGlcp | 104.1 | 74.2 | 76.8 | 70.5 | 77.1 | 61.6 |
| 3,6,3 | bDGalpN | 104.5 | 53.8 | 71.4 | 77.1 | 73.4 | 69.1 |
| 3,6 | aDGalp | 100.2 | 68.5 | 80.5 | 70.4 | 71.8 | 62.2 |
| 3 | bDGalp | 105.7 | 71.6 | 73.7 | 69.7 | 74.8 | 67.3 |
| 2 | Ac | |
| | aDGalpN | 99.8 | 49.8 | 78.7 | 69.2 | 71.4 | 61.6 |
|
There is only one chemically distinct structure:
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