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. 2024 Oct 22;12(12):e01838-24. doi: 10.1128/spectrum.01838-24

TABLE 1.

Chemical shifts in the 1H and 13C NMR spectra (δ, ppm)a,b

Monosaccharide residuec C1 C2 C3 C4 C5 C6
H1 H2 H3 H4 H5 H6 (6a,6b)
CPS
→3)-β-d-GlcpNAc-(1→ A 102.7
4.79
56.9
3.81
82.9
3.62
70.2
3.47
77.4
3.47
62.8
3.71, 3.89
→2)-α-l-Rhap-(1→ B 101.1
5.03
81.3
3.78
71.5
3.85
73.5
3.46
70.4
3.78
18.1
1.28
→3)-α-l-Rhap-(1→ C 103.6
4.86
71.4
4.11
78.9
3.81
73.1
3.55
4.05
70.4
17.9
1.25
→2,3)-α-l-Rhap-(1→ D 102.0
5.17
78.6
4.23
80.3
4.00
72.6
3.52
70.4
3.82
18.1
1.30
→2)-α-l-Rhap-(1→ E 101.6
5.22
81.4
4.11
71.4
3.86
73.4
3.48
70.4
3.79
18.1
1.29
→4)-β-d-GlcpA-(1→ F 105.4
4.69
75.2
3.42
75.4
3.63
80.3
3.63
76.8
3.90
175.1
→3)-α-l-Rhap-(1→ G 102.0
4.75
71.4
4.02
79.5
3.80
72.6
3.52
70.4
4.00
17.9
1.24
α-l-Rhap-(1→ H 103.6
5.09
71.4
4.05
71.7
3.82
73.9
3.46
70.4
3.72
17.9
1.25
OSd
β-d-GlcpNAc-(1→ A'e 104.1
4.74
57.5
3.75
75.3
3.57
71.5
3.46
77.3
3.45
62.3
3.76, 3.92
→3)-α-l-Rhap-(1→ D' 103.4
5.04
71.4
4.27
75.3
3.57
73.0
3.55
70.7
3.96
18.2
1.28
→3)-α-l-Rhap-(1→ C' 101.0
4.97
71.8
4.08
80.0
3.87
72.6
3.52
70.8
3.83
18.2
1.28
→2)-R B' 90.9
5.11
81.6
3.64
61.2
3.74; 3.86
a

Structures of the K71 CPS and OS are shown in Fig. 3. 1H NMR chemical shifts are shown in italics.

b

R indicates glyceraldehyde in the hydrated form HOCH2CH(O–)CH(OH)2.

c

Signals for the N-acetyl group of GlcpNAc are at δС 24.0 (Me) and 175.6 (CO), δH 2.07 in the CPS, δС 23.8 (Me) and 176.2 ppm (CO), δH 2.04 in the OS.

d

OS, oligosaccharide.

e

Bold face text refers to the residues detected and their order