TABLE 4.
K antigens of Sinorhizobium spp.
| KR no.a | Strain | Complete and partial structuresb | Reference |
|---|---|---|---|
| KR1 | S. Fredii USDA205 | [→3)-α-d-Galp-(1→5)-β-d-Kdop-(2→]n | 29 |
| KR2 | [−2-O-MeMann→β-Kdo−]n | 29 | |
| KR3 | S. fredii USDA257 | [→3)-β-d-Manp-(1→5)-β-d-Kdop-(2→]n | 9 |
| KR4 | [→3)-β-d-2-O-MeManp-(1→5)-β-d-Kdop-(2→]n | 9 | |
| KR5 | S. meliloti AK631 | [−β-GlcA→Pse5N(β-OH-But)7NAc−]n | 27 |
| KR6 | S. meliloti NGR247 | [−α-Glc→α-NeuNAc−]n | This report |
| KR7 | S. meliloti NGR185 | [−β-GlcNAc→β-Kdo−]n | This report |
| KR8 | S. fredii USDA208 | [−α-Gal→β-Kdo−]n | This report |
| KR9 | S. fredii USDA201 | [−α-Gal→β-Kdo→α-2-O-MeHex→β-Kdo−]n | This report |
| KR10 | Sinorhizobium sp. strain NGR234 | [−β-Glc→α-Pse5NAc7NAc−]n | This report |
| KR11 | S. fredii HH303 | [Rha, GalA]n | This report |
| Consensus structurec | [−Sug→Kdx−]n |
a
Numerical designation of the K antigen.
b
Pse, 5,7-diamino-3,5,7,9-tetradeoxynonulosonic acid (pseudaminic acid); Ac, acetyl group; β-OH-But, β-OH-butyryl group; Me, methyl group; Sug, any hexose; Kdx, any 1-carboxy-2-keto-3-deoxy sugar. Note that the correct designation, Pse, is used in this report instead of Kdn, which was used in a past report (9).
c
The K antigen from S. fredii USDA201 consists of tetrasaccharide repeats [(Sug→Kdx)2]n but conforms to the consensus structure. The only exception to the consensus structure that has been found is from S. fredii HH303.