Taxonomic group: bacteria / Proteobacteria
(Phylum: Proteobacteria)
Associated disease: infection due to Escherichia coli [ICD11:
XN6P4 
]
The structure was elucidated in this paperPublication DOI: 10.1016/0008-6215(90)84210-LJournal NLM ID: 0043535Publisher: Elsevier
Institutions: School of Pharmaceutical Sciences, Rhodes University, Grahamstown, 6140 South Africa, Department of Chemistry, University of British Columbia, Vancouver, BC, V6T 1Y6 Canada
The primary structure of the acidic capsular polysaccharide of Escherichia coli K57 was elucidated by methylation analysis and 1D- and 2D-n.m.r. spectroscopy. The repeating unit was identified as a linear tetrasaccharide having the structure shown [structure: see text].
Structure type: polymer chemical repeating unit
Location inside paper: abstract, p.454
Compound class: CPS, O-polysaccharide, K-antigen
Contained glycoepitopes: IEDB_136044,IEDB_137340,IEDB_137472,IEDB_141794,IEDB_141807,IEDB_142078,IEDB_149136,IEDB_150899,IEDB_151531,IEDB_190606,SB_137,SB_165,SB_166,SB_187,SB_195,SB_29,SB_7,SB_88
Methods: 1H NMR, NMR-2D
Related record ID(s): 2995, 4016
NCBI Taxonomy refs (TaxIDs): 562Reference(s) to other database(s): GTC:G76500PH, GlycomeDB:
5930
Show glycosyltransferases
NMR conditions: in D2O at 313 K
[as TSV]
13C NMR data:
Linkage Residue C1 C2 C3 C4 C5 C6
4,3,4 bDRibf 108.9 80.74 70.96 83.89 63.46
4,3 bDGalp 104.25 71.56 73.69 77.22 75.19 62.01
4,2 Ac ? 23.24
4 aDGlcpN 100.07 53.36 80.85 69.21 72.76 61.16
aDGalpA 98.72 68.90 69.68 80.93 72.28 ?
1H NMR data:
Linkage Residue H1 H2 H3 H4 H5 H6
4,3,4 bDRibf 5.39 4.28 4.24 4.07 3.67-3.83
4,3 bDGalp 4.46 3.52 3.79 4.05 3.78 3.78-3.78
4,2 Ac - 2.11
4 aDGlcpN 4.93 4.09 3.92 3.62 4.16 3.78-3.85
aDGalpA 5.24 3.93 4.10 4.38 4.51 -
1H/13C HSQC data:
Linkage Residue C1/H1 C2/H2 C3/H3 C4/H4 C5/H5 C6/H6
4,3,4 bDRibf 108.9/5.39 80.74/4.28 70.96/4.24 83.89/4.07 63.46/3.67-3.83
4,3 bDGalp 104.25/4.46 71.56/3.52 73.69/3.79 77.22/4.05 75.19/3.78 62.01/3.78-3.78
4,2 Ac 23.24/2.11
4 aDGlcpN 100.07/4.93 53.36/4.09 80.85/3.92 69.21/3.62 72.76/4.16 61.16/3.78-3.85
aDGalpA 98.72/5.24 68.90/3.93 69.68/4.10 80.93/4.38 72.28/4.51
1H NMR data:
| Linkage | Residue | H1 | H2 | H3 | H4 | H5 | H6 |
|---|
| 4,3,4 | bDRibf | 5.39 | 4.28 | 4.24 | 4.07 | 3.67
3.83 | |
| 4,3 | bDGalp | 4.46 | 3.52 | 3.79 | 4.05 | 3.78 | 3.78
3.78 |
| 4,2 | Ac |
| 2.11 | |
| 4 | aDGlcpN | 4.93 | 4.09 | 3.92 | 3.62 | 4.16 | 3.78
3.85 |
| | aDGalpA | 5.24 | 3.93 | 4.10 | 4.38 | 4.51 |
|
|
13C NMR data:
| Linkage | Residue | C1 | C2 | C3 | C4 | C5 | C6 |
|---|
| 4,3,4 | bDRibf | 108.9 | 80.74 | 70.96 | 83.89 | 63.46 | |
| 4,3 | bDGalp | 104.25 | 71.56 | 73.69 | 77.22 | 75.19 | 62.01 |
| 4,2 | Ac | ? | 23.24 | |
| 4 | aDGlcpN | 100.07 | 53.36 | 80.85 | 69.21 | 72.76 | 61.16 |
| | aDGalpA | 98.72 | 68.90 | 69.68 | 80.93 | 72.28 | ? |
|
![](nmr_drawer.py?width=750&height=130&nucleus=C&rotate_labels=false&spectrum=[{"s":108.9,"l":"1","c":[0,0,225]},{"s":80.74,"l":"2","c":[0,0,225]},{"s":70.96,"l":"3","c":[0,0,225]},{"s":83.89,"l":"4","c":[0,0,225]},{"s":63.46,"l":"5","c":[0,0,225]},{"s":104.25,"l":"1","c":[230,0,30]},{"s":71.56,"l":"2","c":[230,0,30]},{"s":73.69,"l":"3","c":[230,0,30]},{"s":77.22,"l":"4","c":[230,0,30]},{"s":75.19,"l":"5","c":[230,0,30]},{"s":62.01,"l":"6","c":[230,0,30]},{"s":23.24,"l":"2","c":[0,0,0]},{"s":100.07,"l":"1","c":[0,165,0]},{"s":53.36,"l":"2","c":[0,165,0]},{"s":80.85,"l":"3","c":[0,165,0]},{"s":69.21,"l":"4","c":[0,165,0]},{"s":72.76,"l":"5","c":[0,165,0]},{"s":61.16,"l":"6","c":[0,165,0]},{"s":98.72,"l":"1","c":[120,0,225]},{"s":68.9,"l":"2","c":[120,0,225]},{"s":69.68,"l":"3","c":[120,0,225]},{"s":80.93,"l":"4","c":[120,0,225]},{"s":72.28,"l":"5","c":[120,0,225]}])
The spectrum also has 2 signals at unknown positions (not plotted). |
There is only one chemically distinct structure:
Found 
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