Supporting information for Goon et al. (2003) Proc. Natl. Acad. Sci. USA, 10.1073/pnas.0437851100
Table 1. Exact Masses of Unnatural Sialyl-LOS Determined by ESI-MS
Sialyl Analog (SiaX) | Concentration, mM | Mr (calc) | Mr (obs) | D m, ppm |
No added substrate | 0.0005* | 3247.0959 | 3247.1087 | 3.9 |
SiaProp | 1 | 3261.1114 | 3261.0947 | 5.1 |
SiaBut | 1 | 3275.1269 | 3275.1155 | 3.5 |
SiaPent | 1 | 3289.1424 | 3289.0817 | 18.4 |
SiaHex | 1 | 3303.1579 | 3303.1496 | 2.5 |
SiaHept | 1 | 3317.1736 | 3317.1848 | 3.4 |
SiaOct | 1 | 3331.1892 | -- | -- |
* The concentration of sialic acid in the growth media is 0.5 µM.