Abstract
A Galβ1-4GlcNAc α(2-6)-sialyltransferase from human liver was purified 34 340-fold with 18% yield by dye chromatography on Cibacron Blue F3GA and cation exchange FPLC. The enzyme preparation was free of other sialyltransferases. It did not contain CMP-NeuAc hydrolase, protease, or sialidase activity, and was stable at −20°C for at least eight months. The donor substrate specificity was examined with CMP-NeuAc analogues modified at C-5 or C-9 of theN-acetylneuraminic acid moiety. Affinity of the human enzyme for parent CMP-NeuAc and each CMP-NeuAc analogue was substantially higher than the corresponding Galβ1-4GlcNAc α(2-6)-sialyltransferase from rat liver.
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Abbreviations
- FPLC:
-
fast protein liquid chromatography
- NeuAc:
-
5-N-acetyl-d-neuraminic acid
- 9-amino-NeuAc:
-
5-acetamido-9-amino-3,5,9-trideoxy-d-glycero-2-nonulosonic acid
- 9-acetamido-NeuAc:
-
5,9-diacetamido-3,5,9-trideoxy-d-glycero-β-d-2-nonulosonic acid
- 9-benzamido-NeuAc:
-
5-acetamido-9-benzamido-3,5,9-trideoxy-d-glycero-β-d-galacto-2-nonulosonic acid
- 9-fluoresceinyl-NeuAc:
-
9-fluoresceinylthioureido-NeuAc
- 5-formyl-Neu:
-
5-formyl-β-d-neuraminic acid
- 5-aminoacetyl-Neu:
-
5-aminoacetyl-β-d-neuraminic acid
- CMP-NeuAc:
-
cytidine-5′-monophospho-N-acetylneuraminic acid
- GM1 :
-
Galβ1-3GalNAcβ1-4(NeuAcα2-3)Galβ1-4Glc-ceramide
- ST:
-
sialyltransferase
- DTE:
-
1,4-dithioerythritol
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Enzyme: Galβ1-4GlcNAc α(2-6)-sialyltransferase, EC 2.4.99.1.
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Sticher, U., Gross, H.J. & Brossmer, R. Purification and characterization of α(2-6)-sialyltransferase from human liver. Glycoconjugate J 8, 45–54 (1991). https://doi.org/10.1007/BF00731642
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DOI: https://doi.org/10.1007/BF00731642