Abstract
A β1-3 galactosyltransferase (GalT-3; UDP-Gal; GM2 β1-3galactosyltransferase) was purified over 5100-fold from 19-day-old embryonic chicken brain homogenate employing detergent solubilization, α-lactalbumin Sepharose, Q-Sepharose, UDP-hexanolamine Sepharose, and GalNAcβ1-4Galβ-Synsorb column chromatography. The purified enzyme was resolved into two bands on reducing gels with apparent molecular weights of 62 kDa and 65 kDa, respectively. GalT-3 activity was also localized in the same regions by activity gel analysis and sucrose-density gradient centrifugation of a detergent-solubilized extract of 19-day-old embryonic chicken brain. Purified GalT-3 exhibited apparentK mS of 33 µm, 22 µm and 14.4mM with respect to the substrates GM2, UDP-galactose, and MnCl2, respectively. Substrate specificity studies with the purified enzyme and a variety of glycosphingolipids, glycoproteins, and synthetic substrates revealed that the enzyme was highly specific only for the glycosphingolipid acceptors, GM2 and GgOse3Cer (asialo-GM2). Ovine-asialo-agalacto submaxillary mucin inhibited the transfer of galactose to GM2 but did not act as an acceptor in the range of concentrations tested. Polyclonal antibodies raised against purified GalT-3 inhibited GalT-3 activityin vitro and Western-immunoblot analysis of purified GalT-3 showed immunopositive bands at 62 and 65 kDa.
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Abbreviations
- CNS:
-
central nervous system
- GM1:
-
monosialotetraosylganglioside, Galβ1-3GalNAcβ1-4(NeuAcα2-3)Galβ1-4Glcβ1-1Cer
- GM2:
-
monosialotriaosylganglioside, GalNAcβ1-4(NeuAcα2-3)Galβ1-4Glcβ1-1Cer
- DSS:
-
detergent solubilized supernatant
- ECB:
-
embryonic chicken brain
- TBS:
-
Tris-buffered saline
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Ghosh, S., Kyle, J.W., Dastgheib, S. et al. Purification, properties, and immunological characterization of GalT-3 (UDP-galactose: GM2 ganglioside, β1-3 galactosyltransferase) from embryonic chicken brain. Glycoconjugate J 12, 838–847 (1995). https://doi.org/10.1007/BF00731246
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DOI: https://doi.org/10.1007/BF00731246