TABLE 2.
Mr values observed for lipid A structures of the 7169kdsA11 mutant as detected by negative reflectron MALDI-MS spectra
| Mra | Predicted lipid A structureb | |
|---|---|---|
| Observed | Calculated | |
| 1905.94 | 1906.18 | 4× C12:0(3-OH), C12:0, 2× C10:0, PEA |
| 1782.95 | 1783.17 | 4× C12:0(3-OH), C12:0, 2× C10:0 |
| 1723.81 | 1724.01 | 4× C12:0(3-OH), 2× C10:0, PEA |
| 1628.85 | 1629.03 | 4× C12:0(3-OH), C12:0, C10:0 |
| 1600.82 | 1601.00 | 4× C12:0(3-OH), 2× C10:0 |
| 1569.70 | 1569.87 | 4× C12:0(3-OH), C10:0, PEA |
| 1458.89 | 1458.90 | 3× C12:0(3-OH), C12:0, C10:0, + 28 Da (2× CH2) |
| 1446.72 | 1446.86 | 4× C12:0(3-OH), C10:0 |
| 1430.87 | 1430.87 | 3× C12:0(3-OH), C12:0, C10:0 |
| 1402.85 | 1402.84 | 3× C12:0(3-OH), 2× C10:0 |
a
All mass values represent exact monoisotopic masses.
b
All structures are listed on the basis of a core containing two glucosamine and two phosphate moieties with additional groups as listed.