  2.4.2.B4 | 3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->4)-3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->6)-2-deoxy-2-[[(3R)-3-hydroxypentadecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose + 4-amino-4-deoxy-alpha-L-arabinopyranosyl undecaprenyl phosphate |
attachment of the cationic sugar 4-amino-4-deoxy-L-arabinose to lipid A is required for the maintenance of polymyxin resistance in Salmonella typhimurium. Lipid A molecules containing a Kdo disaccharide are modified with two 4-amino-4-deoxy-alpha-L-arabinose units (at the 1-phosphate moiety and at the 4'-phosphate moiety), indicating that the addition of L-Ara4N to the 4'-position is KDO-dependent. ArnT is a bifunctional glycosyltransferase in that it can incorporate two 4-amino-4-deoxy-alpha-L-arabinose units. Transfer to lipid A occurs on the periplasmic side of the inner membrane |
Salmonella enterica subsp. enterica serovar Typhimurium |
3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->4)-3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->6)-2-deoxy-2-[[(3R)-3-hydroxypentadecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-(4-amino-4-deoxy-alpha-L-arabinopyranosyl)phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-(4-amino-4-deoxy-alpha-L-arabinopyranosyl)phosphono-alpha-D-glucopyranose + undecaprenyl phosphate |
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| 2.4.2.B4 | 3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->4)-3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->6)-2-deoxy-2-[[(3R)-3-hydroxypentadecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose + 4-amino-4-deoxy-alpha-L-arabinopyranosyl undecaprenyl phosphate |
lipid A molecules containing a KDO disaccharide are modified with two 4-amino-4-deoxy-alpha-L-arabinose units (at the 1-phosphate moiety and at the 4'-phosphate moiety), indicating that the addition of L-Ara4N to the 4'-position is KDO-dependent |
Salmonella enterica subsp. enterica serovar Typhimurium |
3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->4)-3-deoxy-alpha-D-manno-oct-2-ulopyranosyl-(2->6)-2-deoxy-2-[[(3R)-3-hydroxypentadecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-(4-amino-4-deoxy-alpha-L-arabinopyranosyl)phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-(4-amino-4-deoxy-alpha-L-arabinopyranosyl)phosphono-alpha-D-glucopyranose + undecaprenyl phosphate |
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